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Zani, V.; Renero-Lecuna, C.; Jimenez de Aberasturi, D.; di Silvio, D.; Kavak, S.; Bals, S.; Signorini, R.; Liz-Marzán, L.M. |
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Title |
Core–Shell Colloidal Nanocomposites for Local Temperature Monitoring during Photothermal Heating |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
The Journal of Physical Chemistry C |
Abbreviated Journal |
J. Phys. Chem. C |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Determining temperature changes at the heating site to accurately control thermal treatments has been a major goal in the field of nanothermometry. In this study, we address the need to effectively monitor local temperature during the application of photothermal therapies, which is essential to prevent uncontrolled heating induced by nanoparticle sensitizers used in such treatments. For this purpose, we developed a synthetic protocol to produce a nanocomposite probe that allows local photothermal heating and simultaneous in situ optical nanothermometry, within the biological transparency windows. The nanocomposite material comprises gold nanorods for light-to-heat conversion and neodymium (Nd3+)-based nanoparticles for local temperature monitoring. An inert spacer made of mesoporous silica provides a core-shell structure and ensures uniform separation between both functionalities to prevent photoluminescence quenching. By using an 808 nm laser as the source for both heating and photoluminescence excitation, we demonstrate a direct correlation between local temperature and near infrared Nd3+ emission intensities, thereby providing precise local temperature monitoring. Different levels of local heating were studied by varying the incident laser power, resulting in a maximum temperature increase of 47 °C detected with the nanothermometers. Albeit presented here as a proof of concept, this concept can be translated to the design of materials for photothermal therapy. |
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Publication Date  |
2024-10-03 |
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ISSN |
1932-7447 |
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Impact Factor |
3.7 |
Times cited |
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Notes |
L.L.L.-M. acknowledges financial support by the Spanish Agencia Estatal de Investigación and FEDER (PID2023-151281OB-I00), S.K. acknowledges the Flemish Fund for Scientific Research (FWO Vlaanderen) through a PhD research grant (Project numbers: 1181122N & 1181124N) and the European Research Council (CoG 815128, REALNANO). |
Approved |
Most recent IF: 3.7; 2024 IF: 4.536 |
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Call Number |
EMAT @ emat @ |
Serial |
9328 |
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Author |
Stoops, T.; De Backer, A.; Lobato, I.; Van Aert, S. |
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Title |
Obtaining 3D Atomic Reconstructions from Electron Microscopy Images Using a Bayesian Genetic Algorithm: Possibilities, Insights, and Limitations |
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A1 Journal Article |
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Year |
2024 |
Publication |
Microscopy and Microanalysis |
Abbreviated Journal |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
The Bayesian genetic algorithm (BGA) is a powerful tool to reconstruct the 3D structure of mono-atomic single-crystalline metallic nanoparticles imaged using annular dark field scanning transmission electron microscopy. The number of atoms in a projected atomic column in the image is used as input to obtain an accurate and atomically precise reconstruction of the nanoparticle, taking prior knowledge and the finite precision of atom counting into account. However, as the number of parameters required to describe a nanoparticle with atomic detail rises quickly with the size of the studied particle, the computational costs of the BGA rise to prohibitively expensive levels. In this study, we investigate these computational costs and propose methods and control parameters for efficient application of the algorithm to nanoparticles of at least up to 10 nm in size. |
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Publication Date |
2024-10-02 |
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ISSN |
1431-9276 |
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Impact Factor |
2.8 |
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Notes |
European Research Council, 770887 ; Research Foundation Flanders, G034621N G0A7723N 40007495 ; FWO and F.R.S-FNRS; Flemish Government; |
Approved |
Most recent IF: 2.8; 2024 IF: 1.891 |
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Call Number |
EMAT @ emat @ |
Serial |
9270 |
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Author |
Schrenker, N.J.; Braeckevelt, T.; De Backer, A.; Livakas, N.; Yu, C.-P.; Friedrich, T.; Roeffaers, M.B.J.; Hofkens, J.; Verbeeck, J.; Manna, L.; Van Speybroeck, V.; Van Aert, S.; Bals, S. |
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Title |
Investigation of the Octahedral Network Structure in Formamidinium Lead Bromide Nanocrystals by Low-Dose Scanning Transmission Electron Microscopy |
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A1 Journal Article |
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Year |
2024 |
Publication |
Nano Letters |
Abbreviated Journal |
Nano Lett. |
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Volume |
24 |
Issue |
35 |
Pages |
10936-10942 |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Metal halide perovskites (MHP) are highly promising semiconductors. In this study, we focus on FAPbBr3 nanocrystals, which are of great interest for green light-emitting diodes. Structural parameters significantly impact the properties of MHPs and are linked to phase instability, which hampers long-term applications. Clearly, there is a need for local and precise characterization techniques at the atomic scale, such as transmission electron microscopy. Because of the high electron beam sensitivity of MHPs, these investigations are extremely challenging. Here, we applied a low-dose method based on four-dimensional scanning transmission electron microscopy. We quantified the observed elongation of the projections of the Br atomic columns, suggesting an alternation in the position of the Br atoms perpendicular to the Pb–Br–Pb bonds. Together with molecular dynamics simulations, these results remarkably reveal local distortions in an on-average cubic structure. Additionally, this study provides an approach to prospectively investigating the fundamental degradation mechanisms of MHPs. |
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Publication Date |
2024-09-04 |
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ISSN |
1530-6984 |
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Impact Factor |
10.8 |
Times cited |
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Notes |
The authors acknowledge financial support from the Research Foundation-Flanders (FWO) through project fundings (G0A7723N) and a postdoctoral fellowship to N.J.S. (FWO Grants 1238622N and V413524N). The authors acknowledge financial support from iBOF-21-085 PERSIST. S.B. and S.V.A. acknowledge financial support from the European Commission by ERC Consolidator Grant 815128 (REALNANO) and Grant 770887 (PICOMETRICS). L.M. acknowledges financial support from the European Commission by ERC Advanced Grant 101095974 (NEHA). V.V.S. furthermore acknowledges the Research Fund of Ghent University (BOF) for its financial support. The computational resources and services used in this work were provided by VSC (Flemish Supercomputer Center), funded by the Research Foundation-Flanders (FWO), and the Flemish Government. |
Approved |
Most recent IF: 10.8; 2024 IF: 12.712 |
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Call Number |
EMAT @ emat @ |
Serial |
9273 |
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Author |
de Block, T.; De Baetselier, I.; Van den Bossche, D.; Abdellati, S.; Gestels, Z.; Laumen, J.G.E.; Van Dijck, C.; Vanbaelen, T.; Claes, N.; Vandelannoote, K.; Kenyon, C.; Harrison, O.; Santhini Manoharan-Basil, S. |
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Title |
Genomic oropharyngeal Neisseria surveillance detects MALDI-TOF MS species misidentifications and reveals a novel Neisseria cinerea clade |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
Journal of Medical Microbiology |
Abbreviated Journal |
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Volume |
73 |
Issue |
8 |
Pages |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Introduction. Commensal Neisseria spp. are highly prevalent in the oropharynx as part of the healthy microbiome. N. meningitidis can colonise the oropharynx too from where it can cause invasive meningococcal disease. To identify N. meningitidis, clinical microbiology laboratories often rely on Matrix Assisted Laser Desorption/Ionisation Time of Flight Mass Spectrometry (MALDI-TOF MS).
Hypothesis/Gap statement. N. meningitidis may be misidentified by MALDI-TOF MS.
Aim. To conduct genomic surveillance of oropharyngeal Neisseria spp. in order to: (i) verify MALDI-TOF MS species identification, and (ii) characterize commensal Neisseria spp. genomes.
Methodology. We analysed whole genome sequence (WGS) data from 119 Neisseria spp. isolates from a surveillance programme for oropharyngeal Neisseria spp. in Belgium. Different species identification methods were compared: (i) MALDI-TOF MS, (ii) Ribosomal Multilocus Sequence Typing (rMLST) and (iii) rplF gene species identification. WGS data were used to further characterize Neisseria species found with supplementary analyses of Neisseria cinerea genomes.
Results. Based on genomic species identification, isolates from the oropharyngeal Neisseria surveilence study were composed of the following species: N. meningitidis (n=23), N. subflava (n=61), N. mucosa (n=15), N. oralis (n=8), N. cinerea (n=5), N. elongata (n=3), N. lactamica (n=2), N. bacilliformis (n=1) and N. polysaccharea (n=1). Of these 119 isolates, four isolates identified as N. meningitidis (n=3) and N. subflava (n=1) by MALDI-TOF MS, were determined to be N. polysaccharea (n=1), N. cinerea (n=2) and N. mucosa (n=1) by rMLST. Phylogenetic analyses revealed that N. cinerea isolates from the general population (n=3, cluster one) were distinct from those obtained from men who have sex with men (MSM, n=2, cluster two). The latter contained genomes misidentified as N. meningitidis using MALDI-TOF MS. These two N. cinerea clusters persisted after the inclusion of published N. cinerea WGS (n=42). Both N. cinerea clusters were further defined through pangenome and Average Nucleotide Identity (ANI) analyses.
Conclusion. This study provides insights into the importance of genomic genus-wide Neisseria surveillance studies to improve the characterization and identification of the Neisseria genus. |
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Publication Date |
2024-08-30 |
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ISSN |
0022-2615 |
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Impact Factor |
3 |
Times cited |
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Open Access |
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Notes |
We would like to thank all the study participants for their help in this study. This research was supported by SOFI 2021 grant—‘PReventing the Emergence of untreatable STIs via radical Prevention’ (PRESTIP). |
Approved |
Most recent IF: 3; 2024 IF: 2.159 |
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Call Number |
EMAT @ emat @ |
Serial |
9262 |
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Khalil, I.; Rigamonti, M.G.; Janssens, K.; Bugaev, A.; Arenas Esteban, D.; Robijns, S.; Donckels, T.; Beydokhti, M.T.; Bals, S.; De Vos, D.; Dusselier, M. |
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Title |
Atomically dispersed ruthenium hydride on beta zeolite as catalysts for the isomerization of muconates |
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A1 Journal article |
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Year |
2024 |
Publication |
Nature Catalysis |
Abbreviated Journal |
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Volume |
7 |
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Pages |
921-933 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Abstract |
Searching for sustainable polymers requires access to biomass-based monomers. In that sense, glucose-derived cis,cis-muconic acid stands as a high-potential intermediate. However, to unlock its potential, an isomerization to the value-added trans,trans-isomer, trans,trans-muconic acid, is required. Here we develop atomically dispersed low-loaded Ru on beta zeolite catalysts that produce trans,trans-muconate in ethanol with total conversion (to equilibrium) and a selectivity of >95%. We reach very high turnovers per Ru and productivity rates of 427 mM h(-1) (similar to 85 g l(-1) h(-1)), surpassing the bio-based cis,cis-muconic acid production rates by an order of magnitude. By coupling isomerization to Diels-Alder cycloaddition, terephthalate intermediates are produced in around 90% yields, circumventing the isomer equilibrium. Isomerization is promoted by Ru hydride species where the hydrides are generated from the alcohol solvent, as evidenced by Fourier transform infrared spectroscopy. Beyond isomerization, the Ru-zeolite and its hydride-forming capacity could be of use as a heterogeneous catalyst for other hydride chemistries, demonstrated by a successful hydride transfer hydrogenation. |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001294 |
Publication Date |
2024-08-19 |
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ISSN |
2520-1158 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
37.8 |
Times cited |
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Approved |
Most recent IF: 37.8; 2024 IF: NA |
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Call Number |
UA @ admin @ c:irua:207521 |
Serial |
9277 |
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Yari, S.; Bird, L.; Rahimisheikh, S.; Reis, A.C.; Mohammad, M.; Hadermann, J.; Robinson, J.; Shearing, P.R.; Safari, M. |
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Title |
Probing charge transport and microstructural attributes in solvent- versus water-based electrodes with a spotlight on Li-S battery cathode |
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A1 Journal article |
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2024 |
Publication |
Advanced energy materials |
Abbreviated Journal |
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2402163 |
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A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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In the quest for environmentally benign battery technologies, this study examines the microstructural and transport properties of water-processed electrodes and compares them to conventionally formulated electrodes using the toxic solvent, N-Methyl-2-pyrrolidone (NMP). Special focus is placed on sulfur electrodes utilized in lithium-sulfur batteries for their sustainability and compatibility with diverse binder/solvent systems. The characterization of the electrodes by X-ray micro-computed tomography reveals that in polyvinylidene fluoride (PVDF) Lithium bis(trifluoromethanesulfonyl)imide/NMP, sulfur particles tend to remain in large clusters but break down into finer particles in carboxymethyl cellulose-styrene butadiene rubber (CMC-SBR)/water and lithium polyacrylate (LiPAA)/water dispersions. The findings reveal that in the water-based electrodes, the binder properties dictate the spatial arrangement of carbon particles, resulting in either thick aggregates with short-range connectivity or thin films with long-range connectivity among sulfur particles. Additionally, cracking is found to be particularly prominent in thicker water-based electrodes, propagating especially in regions with larger particle agglomerates and often extending to cause local delamination of the electrodes. These microstructural details are shown to significantly impact the tortuosity and contact resistance of the sulfur electrodes and thereby affecting the cycling performance of the Li-S battery cells. The choice of solvent and binder is crucial in determining particle surface charge, which directly influences active material dispersion and carbon-binder arrangement within the battery porous electrodes. This, in turn, affects ionic and electronic transport properties, ultimately impacting electrochemical performance. Meticulous engineering of the slurry to control these factors is essential for efficient and sustainable water-based electrode processing. image |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001291 |
Publication Date |
2024-08-16 |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISSN |
1614-6832; 1614-6840 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
27.8 |
Times cited |
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Approved |
Most recent IF: 27.8; 2024 IF: 16.721 |
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Call Number |
UA @ admin @ c:irua:207624 |
Serial |
9311 |
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Gholam, S.; Hadermann, J. |
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Title |
The effect of the acceleration voltage on the quality of structure determination by 3D-electron diffraction |
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A1 Journal Article |
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Year |
2024 |
Publication |
Ultramicroscopy |
Abbreviated Journal |
Ultramicroscopy |
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Volume |
266 |
Issue |
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Pages |
114022 |
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A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Nowadays, 3D Electron Diffraction (3DED) is widely used for the structure determination of sub-micron-sized particles. In this work, we investigate the influence of the acceleration voltage on the quality of 3DED datasets acquired on BaTiO3 nanoparticles. Datasets were acquired using a wide range of beam energies, from common, high acceleration voltages (300 kV and 200 kV) to medium (120 kV and 80 kV) and low acceleration voltages (60 kV and 30 kV). In the integration process, Rint increases as the beam energy reduces, which is mainly due to the increased dynamical scattering. Nevertheless, the structure was solved successfully in all cases. The structure refinement was comparable for all beam energies with small deficiencies such as negative atomic displacements for the heaviest atom in the structure, barium. Including extinction correction in the refinement noticeably improved the model for low acceleration voltages, probably due to higher beam absorption in these cases. Dynamical refinement, however, shows superior results for higher acceleration voltages, since the dynamical refinement calculations currently discard inelastic scattering effects. |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001297 |
Publication Date |
2024-08-05 |
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ISSN |
0304-3991 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
2.2 |
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The authors acknowledge funding from the Research Foundation Flanders (FWO, Belgium) project SBO S000121N. The authors are also grateful to Dr. Armand Béché and Dr. Lars Riekehr for their technical support and to Prof. Lukáš Palatinus, Dr. Stefano Canossa, Dr. Maria Batuk and Amirhossein Hajizadeh for fruitful discussions. |
Approved |
Most recent IF: 2.2; 2024 IF: 2.843 |
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Call Number |
EMAT @ emat @c:irua:208540 |
Serial |
9268 |
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Poppe, R.; Hadermann, J. |
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Optimization of three-dimensional electron diffuse scattering data acquisition |
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A1 Journal Article |
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Year |
2024 |
Publication |
Ultramicroscopy |
Abbreviated Journal |
Ultramicroscopy |
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Volume |
265 |
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Pages |
114023 |
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A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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The diffraction patterns of crystalline materials with local order contain sharp Bragg reflections as well as highly structured diffuse scattering. In this study, we quantitatively show how the diffuse scattering in three-dimensional electron diffraction (3D ED) data is influenced by various parameters, including the data acquisition mode, the detector type and the use of an energy filter. We found that diffuse scattering data used for quantitative analysis are preferably acquired in selected area electron diffraction (SAED) mode using a CCD and an energy filter. In this study, we also show that the diffuse scattering in 3D ED data can be obtained with a quality comparable to that from single-crystal X-ray diffraction. As electron diffraction requires much smaller crystal sizes than X-ray diffraction, this opens up the possibility to investigate the local structure of many technologically relevant materials for which no crystals large enough for single-crystal X-ray diffraction are available. |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001294 |
Publication Date |
2024-08-03 |
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0304-3991 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
2.2 |
Times cited |
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The authors would like to thank Dr. Nikolaj Roth for fruitful discussions and Dr. Lukas Palatinus for providing an option to apply symmetry averaging in the three-dimensional reciprocal lattice in PETS2. The authors also acknowledge the Hercules fund ’Direct electron detector for soft matter TEM’ from Flemish Government for the purchase of the Merlin detector. |
Approved |
Most recent IF: 2.2; 2024 IF: 2.843 |
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Call Number |
EMAT @ emat @c:irua:207457 |
Serial |
9271 |
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Arenas Esteban, D.; Wang, D.; Kadu, A.; Olluyn, N.; Sánchez-Iglesias, A.; Gomez-Perez, A.; González-Casablanca, J.; Nicolopoulos, S.; Liz-Marzán, L.M.; Bals, S. |
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Title |
Quantitative 3D structural analysis of small colloidal assemblies under native conditions by liquid-cell fast electron tomography |
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A1 Journal Article |
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Year |
2024 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat Commun |
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Volume |
15 |
Issue |
1 |
Pages |
6399 |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Electron tomography has become a commonly used tool to investigate the three-dimensional (3D) structure of nanomaterials, including colloidal nanoparticle assemblies. However, electron microscopy is typically done under high-vacuum conditions, requiring sample preparation for assemblies obtained by wet colloid chemistry methods. This involves solvent evaporation and deposition on a solid support, which consistently alters the nanoparticle organization. Here, we suggest using electron tomography to study nanoparticle assemblies in their original colloidal liquid environment. To address the challenges related to electron tomography in liquid, we devise a method that combines fast data acquisition in a commercial liquid-cell with a dedicated alignment and reconstruction workflow. We present the advantages of this methodology in accurately characterizing two different systems. 3D reconstructions of assemblies comprising polystyrene-capped Au nanoparticles encapsulated in polymeric shells reveal less compact and more distorted configurations for experiments performed in a liquid medium compared to their dried counterparts. A similar expanded trend can be observed in quantitative analysis of the surface-to-surface distances of self-assembled Au nanorods in water rather than in a vacuum, which agrees with bulk measurements. This study, therefore, emphasizes the importance of developing high-resolution characterization tools that preserve the native environment of colloidal nanostructures. |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001281 |
Publication Date |
2024-07-30 |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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| |
ISSN |
2041-1723 |
ISBN |
|
Additional Links |
UA library record; WoS full record |
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Impact Factor |
16.6 |
Times cited |
|
Open Access |
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| |
Notes |
S.B., D.A.E., D.W., N.O., and A.K. acknowledge financial support from ERC Consolidator Grant Number 815128 REALNANO and Horizon Europe MSCA-SE no. 101131111 – DELIGHT. D.W. acknowledges an Individual Fellowship funded by the Marie Skłodowska-Curie Actions (MSCA) in Horizon 2020 program (grant 894254 SuprAtom). L.M.L.M. acknowledges financial support from Project PID2020-117779RB-I00, State Research Agency of Spain, Ministry of Science and Innovation. |
Approved |
Most recent IF: 16.6; 2024 IF: 12.124 |
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Call Number |
EMAT @ emat @c:irua:207654 |
Serial |
9272 |
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| Permanent link to this record |
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Author |
Ghosh, S.; Pradhan, B.; Bandyopadhyay, A.; Skvortsova, I.; Zhang, Y.; Sternemann, C.; Paulus, M.; Bals, S.; Hofkens, J.; Karki, K.J.; Materny, A. |
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Title |
Rashba-type band splitting effect in 2D (PEA)₂PbI₄ perovskites and its impact on exciton-phonon coupling |
Type |
A1 Journal article |
| |
Year |
2024 |
Publication |
The journal of physical chemistry letters |
Abbreviated Journal |
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| |
Volume |
15 |
Issue |
31 |
Pages |
7970-7978 |
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| |
Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
Despite a few recent reports on Rashba effects in two-dimensional (2D) Ruddlesden-Popper (RP) hybrid perovskites, the precise role of organic spacer cations in influencing Rashba band splitting remains unclear. Here, using a combination of temperature-dependent two-photon photoluminescence (2PPL) and time-resolved photoluminescence spectroscopy, alongside density functional theory (DFT) calculations, we contribute to significant insights into the Rashba band splitting found for 2D RP hybrid perovskites. The results demonstrate that the polarity of the organic spacer cation is crucial in inducing structural distortions that lead to Rashba-type band splitting. Our investigations show that the intricate details of the Rashba band splitting occur for organic cations with low polarity but not for more polar ones. Furthermore, we have observed stronger exciton-phonon interactions due to the Rashba-type band splitting effect. These findings clarify the importance of selecting appropriate organic spacer cations to manipulate the electronic properties of 2D perovskites. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001280 |
Publication Date |
2024-07-30 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1948-7185 |
ISBN |
|
Additional Links |
UA library record; WoS full record |
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Impact Factor |
5.7 |
Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: 5.7; 2024 IF: 9.353 |
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Call Number |
UA @ admin @ c:irua:207672 |
Serial |
9313 |
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| Permanent link to this record |
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Author |
Pompei, E.; Vlamidis, Y.; Ferbel, L.; Zannier, V.; Rubini, S.; Arenas Esteban, D.; Bals, S.; Marinelli, C.; Pfusterschmied, G.; Leitgeb, M.; Schmid, U.; Heun, S.; Veronesi, S. |
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Title |
Functionalization of three-dimensional epitaxial graphene with metal nanoparticles |
Type |
A1 Journal article |
| |
Year |
2024 |
Publication |
Nanoscale |
Abbreviated Journal |
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| |
Volume |
16 |
Issue |
34 |
Pages |
16107-16118 |
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Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
We demonstrate the first successful functionalization of epitaxial three-dimensional graphene with metal nanoparticles. The functionalization is obtained by immersing three-dimensional graphene in a nanoparticle colloidal solution. This method is versatile and demonstrated here for gold and palladium, but can be extended to other types of nanoparticles. We have measured the nanoparticle density on the top surface and in the porous layer volume by scanning electron microscopy and scanning transmission electron microscopy. The samples exhibit a wide coverage of nanoparticles with minimal clustering. We demonstrate that high-quality graphene promotes the functionalization, leading to higher nanoparticle density both on the surface and in the pores. X-ray photoelectron spectroscopy shows the absence of contamination after the functionalization process. Moreover, it confirms the thermal stability of the Au- and Pd-functionalized three-dimensional graphene up to 530 degrees C. Our approach opens new avenues for utilizing three-dimensional graphene as a versatile platform for catalytic applications, sensors, and energy storage and conversion. We report a new technique for fabricating metal-functionalized three-dimensional epitaxial graphene on porous SiC. The process is clean and scalable. The fabricated material exhibits high chemical and thermal stability, and versatility. |
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Corporate Author |
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Thesis |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001283 |
Publication Date |
2024-07-25 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2040-3364; 2040-3372 |
ISBN |
|
Additional Links |
UA library record; WoS full record |
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Impact Factor |
6.7 |
Times cited |
|
Open Access |
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Notes |
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Approved |
Most recent IF: 6.7; 2024 IF: 7.367 |
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Call Number |
UA @ admin @ c:irua:207655 |
Serial |
9292 |
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| Permanent link to this record |
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Author |
Zhang, Y.; Grunewald, L.; Cao, X.; Abdelbarey, D.; Zheng, X.; Rugeramigabo, E.P.; Verbeeck, J.; Zopf, M.; Ding, F. |
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Title |
Unveiling the 3D morphology of epitaxial GaAs/AlGaAs quantum dots |
Type |
A1 Journal article |
| |
Year |
2024 |
Publication |
Nano letters |
Abbreviated Journal |
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Volume |
24 |
Issue |
33 |
Pages |
10106-10113 |
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Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
Strain-free GaAs/AlGaAs semiconductor quantum dots (QDs) grown by droplet etching and nanohole infilling (DENI) are highly promising candidates for the on-demand generation of indistinguishable and entangled photon sources. The spectroscopic fingerprint and quantum optical properties of QDs are significantly influenced by their morphology. The effects of nanohole geometry and infilled material on the exciton binding energies and fine structure splitting are well-understood. However, a comprehensive understanding of GaAs/AlGaAs QD morphology remains elusive. To address this, we employ high-resolution scanning transmission electron microscopy (STEM) and reverse engineering through selective chemical etching and atomic force microscopy (AFM). Cross-sectional STEM of uncapped QDs reveals an inverted conical nanohole with Al-rich sidewalls and defect-free interfaces. Subsequent selective chemical etching and AFM measurements further reveal asymmetries in element distribution. This study enhances the understanding of DENI QD morphology and provides a fundamental three-dimensional structural model for simulating and optimizing their optoelectronic properties. |
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Corporate Author |
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Place of Publication |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001280 |
Publication Date |
2024-07-25 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1530-6984 |
ISBN |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
10.8 |
Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: 10.8; 2024 IF: 12.712 |
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Call Number |
UA @ admin @ c:irua:207525 |
Serial |
9326 |
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| Permanent link to this record |
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Author |
Gholam, S.; Denisov, N.; Orekhov, A.; Verbeeck, J.; Hadermann, J. |
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Title |
An Investigation on 3D Electron Diffraction and 4-Dimensional Scanning Diffraction Tomography Using a Scanning Electron Microscope |
Type |
P1 Conference Proceedings |
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Year |
2024 |
Publication |
Microscopy and Microanalysis |
Abbreviated Journal |
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Volume |
30 |
Issue |
Supplement_1 |
Pages |
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Keywords |
P1 Conference Proceedings; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
During the last decade, 3D-Electron Diffraction (3D-ED) has emerged as a powerful technique for studying the structure of sub-micron particles. It is used in a variety of applications, from unit cell and space group determination to the complete solution of the structure similar to X-ray diffraction techniques. So far, this technique has been only implemented in Transmission Electron Microscopes (TEMs). Performing such an experiment in a Scanning Electron Microscope (SEM) can be challenging, mainly due to the lower acceleration voltage. This lower beam energy raises concerns about severe multiple scattering and limited transmissivity of the sample for the weakly accelerated electrons.
In this work, we show the possibilities of operating similar studies in a modified SEM. For this aim, we equipped our SEM with a custom stage and holder, a direct electron detector and a custom high-angle annular dark-field detector (HAADF). A range of samples was studied in the form of lamellas and sub-micron particles, and the quality of the diffraction data was evaluated for different purposes, such as unit cell determination and space group determination. Moreover, the ability to integrate the diffraction data for structure solution and refinement has been assessed and compared to similar data acquired in a TEM.
Finally, we also demonstrate the potential for combining diffraction tomography and 4-dimensional scanning transmission electron microscopy (4D-STEM) in our setup. This method opens an avenue to obtain multiple 3DED datasets out of 5D-STEM data. These 3DED datasets can be created using object tracking methods from several regions of a multi-domain particle or from multiple single crystals within the scanning region. This provides an attractive route to high-throughput and statistically relevant characterization of polycrystalline materials or powders of nanoparticles. |
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Corporate Author |
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Place of Publication |
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Wos |
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Publication Date |
2024-07-24 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1431-9276 |
ISBN |
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Additional Links |
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Impact Factor |
2.8 |
Times cited |
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Open Access |
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Notes |
The authors acknowledge the financial support of the Research Foundation Flanders (FWO, Belgium) project SBO S000121N. The authors are also grateful to Amsterdam Scientific Instruments. |
Approved |
Most recent IF: 2.8; 2024 IF: 1.891 |
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Call Number |
EMAT @ emat @ |
Serial |
9269 |
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| Permanent link to this record |
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Author |
Chowdhury, M.S.; Esteban, D.A.; Amin, R.; Román-Freijeiro, C.; Rösch, E.L.; Etzkorn, M.; Schilling, M.; Ludwig, F.; Bals, S.; Salgueiriño, V.; Lak, A. |
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Title |
Organic Molecular Glues to Design Three-Dimensional Cubic Nano-assemblies of Magnetic Nanoparticles |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
Chemistry of Materials |
Abbreviated Journal |
Chem. Mater. |
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Volume |
36 |
Issue |
14 |
Pages |
6865-6876 |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
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Thesis |
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Place of Publication |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001275 |
Publication Date |
2024-07-23 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0897-4756 |
ISBN |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
8.6 |
Times cited |
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Open Access |
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Notes |
Ministerio de Ciencia e Innovaci?n, PID2020-119242-I00 ; Deutsche Forschungsgemeinschaft, LA 4923/3-1 RTG 1952 ; Horizon 2020 Framework Programme, 823717 ; |
Approved |
Most recent IF: 8.6; 2024 IF: 9.466 |
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Call Number |
EMAT @ emat @c:irua:207594 |
Serial |
9258 |
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Author |
Quintelier, M.; Hajizadeh, A.; Zintler, A.; Gonçalves, B.F.; Fernández de Luis, R.; Esrafili Dizaji, L.; Vande Velde, C.M.L.; Wuttke, S.; Hadermann, J. |
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Title |
In SituStudy of the Activation Process of MOF-74 Using Three-Dimensional Electron Diffraction |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
Chemistry of Materials |
Abbreviated Journal |
Chem. Mater. |
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Volume |
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Issue |
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Pages |
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Keywords |
A1 Journal Article; 3DED; MOFs; in situ; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Metal–organic framework (MOF)-74 is known for its effectiveness in selectively capturing carbon dioxide (CO2). Especially the Zn and Cu versions of MOF-74 show high efficiency of this material for CO2. However, the activation of this MOF, which is a crucial step for its utilization, is so far not well understood. Here, we are closing the knowledge gap by examining the activation using, for the first time in the MOF, three-dimensional electron diffraction (3DED) during in situ heating. The use of state-of-the-art direct electron detectors enables rapid acquisition and minimal exposure times, therefore minimizing beam damage to the very electron beam-sensitive MOF material. The activation process of Zn-MOF-74 and Cu-MOF-74 is systematically studied in situ, proving the creation of open metal sites. Differences in thermal stability between Zn-MOF-74 and Cu-MOF-74 are attributed to the strength of the metal–oxygen bonds and Jahn–Teller distortions. In the case of Zn-MOF-74, we observe previously unknown remaining electrostatic potentials inside the MOF pores, which indicate the presence of remaining atoms that might impede gas flow throughout the structure when using the MOF for absorption purposes. We believe our study exemplifies the significance of employing advanced characterization techniques to enhance our material understanding, which is a crucial step for unlocking the full potential of MOFs in various applications. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001275 |
Publication Date |
2024-07-22 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0897-4756 |
ISBN |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
8.6 |
Times cited |
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Open Access |
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Notes |
European Regional Development Fund, PID2021-122940OB-C31 ; H2020 Energy, 101022633 ; Universiteit Antwerpen, BOF TOP 38689 ; H2020 Marie Sklodowska-Curie Actions, 956099 ; Fonds Wetenschappelijk Onderzoek, I003218N ; Japan Science and Technology Agency, JPMJSC2102 ; Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo; Agencia Estatal de Investigaci?n,Ministerio de Ciencia, Innovaci?n y Universidades, PID2021-122940OB-C31 TED2021-130621B-C42 ; |
Approved |
Most recent IF: 8.6; 2024 IF: 9.466 |
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Call Number |
EMAT @ emat @c:irua:207555 |
Serial |
9255 |
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| Permanent link to this record |
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Author |
Gao, C. |
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Title |
Exploring electron ptychography for low dose imaging |
Type |
Doctoral thesis |
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Year |
2024 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
xii, 146 p. |
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Keywords |
Doctoral thesis; Electron microscopy for materials research (EMAT) |
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Abstract |
Transmission electron microscopy is an important technique in the exploration of materials’ structures. This is especially true since the development of electron optical aberration correctors greatly facilitated atomic resolution imaging. We are currently experiencing an ongoing revolution in electron microscopy with the widespread adoption of direct electron detectors. Scientists have reported a lot of key scientific findings facilitated by direct electron detectors. One particular research domain is electron ptychography, which holds promise for unraveling the intricate structures of highly beam-sensitive materials like bio samples and achieving super-resolution without the limitation of aperture in the condenser lens system. Nevertheless, challenges persist both in experimental setups and algorithmic processes. Issues such as the comparatively sluggish scanning speed of cameras and contrast reversals of the reconstructed phase for relatively thick specimens, disrupting phase or weak phase approximations, remain noteworthy limitations. This thesis addresses these challenges by the event-driven Timepix3 detector, presenting a viable solution to the speed bottleneck. Moreover, innovative approaches for applying electron ptychography to relatively thick samples, employing a middle focusing strategy, are proposed. This research aims to push the boundaries of electron microscopy, offering solutions to existing limitations and advancing the field towards more efficient and accurate imaging techniques. |
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Wos |
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Publication Date |
2024-07-18 |
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Edition |
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ISBN |
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Additional Links |
UA library record |
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Impact Factor |
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Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: NA |
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Call Number |
UA @ admin @ c:irua:206777 |
Serial |
9289 |
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| Permanent link to this record |
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Author |
Jeong, Y.; Han, B.; Tamayo, A.; Claes, N.; Bals, S.; Samorì, P. |
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Title |
Defect Engineering of MoTe2via Thiol Treatment for Type III van der Waals Heterojunction Phototransistor |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
ACS Nano |
Abbreviated Journal |
ACS Nano |
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Volume |
18 |
Issue |
28 |
Pages |
18334-18343 |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Molybdenum ditelluride (MoTe2) nanosheets have displayed intriguing physicochemical properties and opto-electric characteristics as a result of their tunable and
small band gap (Eg ∼ 1 eV), facilitating concurrent electron and hole transport. Despite the numerous efforts devoted to the development of p-type MoTe2 field-effect transistors (FETs), the presence of tellurium (Te) point vacancies has caused serious reliability issues. Here, we overcome this major
limitation by treating the MoTe2 surface with thiolated molecules to heal Te vacancies. Comprehensive materials and electrical characterizations provided unambiguous evidence for the efficient chemisorption of butanethiol. Our thiol-treated MoTe2 FET exhibited a 10-fold increase in hole current and a positive threshold voltage shift of 25 V, indicative of efficient hole carrier doping. We demonstrated that our powerful molecular engineering strategy can be extended to the controlled formation of van der Waals heterostructures by developing an n-SnS2/thiol-MoTe2 junction FET (thiol-JFET). Notably, the thiol-JFET exhibited a significant negative photoresponse with a responsivity of 50 A W−1 and a fast response time of 80 ms based on band-to-band tunneling. More interestingly, the
thiol-JFET displayed a gate tunable trimodal photodetection comprising two photoactive modes (positive and negative photoresponse) and one photoinactive mode. These findings underscore the potential of molecular engineering approaches in
enhancing the performance and functionality of MoTe2-based nanodevices as key components in advanced 2D-based optoelectronics. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001264 |
Publication Date |
2024-07-16 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1936-0851 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS citing articles; WoS full record |
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Impact Factor |
17.1 |
Times cited |
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Open Access |
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Notes |
The authors acknowledge the financial support from the FLAG-ERA project MULTISPIN funded by the Agence Nationale de la Recherche (ANR-21-GRF1-0003-01). We also acknowledge funding from the European Union’s Horizon Europe research and innovation programme through the project HYPERSONIC (GA-101129613) and the ERC project SUPRA2DMAT (GA-833707) as well as the ANR through the Interdisciplinary Thematic Institute SysChem via the IdEx Unistra (ANR-10-IDEX-0002) within the program Investissement d’Avenir, the Foundation Jean-Marie Lehn and the Institut Universitaire de France (IUF). This work was also supported by National Research Foundation of Korea (NRF) grant funded by Korea government (MSIT) (No. RS-2023- 00251360). |
Approved |
Most recent IF: 17.1; 2024 IF: 13.942 |
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Call Number |
EMAT @ emat @c:irua:207002 |
Serial |
9252 |
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| Permanent link to this record |
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Author |
Van Daele, K.; Balalta, D.; Hoekx, S.; Jacops, R.; Daems, N.; Altantzis, T.; Pant, D.; Breugelmans, T. |
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Title |
Synergy or Antagonism? Exploring the Interplay of SnO2and an N-OMC Carbon Capture Medium for the Electrochemical CO2Reduction toward Formate |
Type |
A1 Journal Article |
| |
Year |
2024 |
Publication |
ACS Applied Energy Materials |
Abbreviated Journal |
ACS Appl. Energy Mater. |
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Volume |
7 |
Issue |
13 |
Pages |
5517-5527 |
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Keywords |
A1 Journal Article; nitrogen-doped ordered mesoporous carbon, SnO2, degradation pathways, electrochemical CO2 reduction, formate; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Closing the anthropogenic carbon cycle by means of the sustainable electrochemical CO2 reduction (eCO2R) toward formate (FA) is a promising strategy for CO2 abatement, clearing the path toward a carbon neutral future. Currently, three possible reaction pathways have been identified for the eCO2R toward FA, all of which are initiated by the adsorption of CO2 on the electrocatalyst’s surface. Therefore, a possible strategy to enhance the availability of CO2 near the active sites is to combine an active electrocatalyst material (here, SnO2) with a known carbon capture medium (here, nitrogen-doped ordered mesoporous carbon (N-OMC)). SnO2 was introduced in situ during the N-OMC synthesis, yielding SnO2-N-OMCs. We approached the state of the art for Sn-based N-doped carbon electrocatalysts in terms of performance under industrially relevant currents with an average FEFA of 59% for SnO2-N-OMC (6) and 61% for SnO2-N-OMC (2). Moreover, the SnO2-N-OMC electrocatalysts require a low overpotential, courtesy of the N-OMC support, compared to the state of the art, for the selective conversion of CO2 toward FA at the industrially relevant current density of 100 mA cm–2. Additionally, the 24 h stability of the best performing SnO2-N-OMC electrocatalysts is explored, and pulverization/agglomeration and in situ SnO2 reduction are identified as major degradation pathways, allowing future research to be steered more accurately toward more stable Sn-based electrocatalysts for the eCO2R toward FA. An optimal combination of both the SnO2 species and the N-OMC carbon capture medium could result in a synergistic effect, especially when utilization of the N-OMC support material is optimized to morphologically stabilize the SnO2 active species. |
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Thesis |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001253 |
Publication Date |
2024-07-08 |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2574-0962 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Impact Factor |
6.4 |
Times cited |
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Open Access |
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Notes |
K.V.D. received financial support through a PhD fellowship strategic basic research (1S83320N) from the Research Foundation Flanders (FWO). Additionally, this project received funding in the framework of the Catalisti cluster SBO project CO2PERATE (“All renewable CCU based on formic acid integrated in an industrial micro-grid”), with financial support of VLAIO (Flemish Agency for Innovation and Entrepreneurship) (UA & VITO). Furthermore, this research was supported by the Interreg 2 Seas-program 2014–2020, cofunded by the European Regional Development Fund under subsidy contract no. E2C 2S03-019 (UA & VITO). D.B. and D.P. acknowledge the support from European Union’s Horizon 2020 MSCA-ITN programme under grant agreement no. 955650 (CATCHY). S.H. is financially supported through a PhD fellowship strategic basic research (1S42623N) from the Research Foundation Flanders (FWO). R.J. received financial support of the federal Energy Transition Fund by FPS Economy. T.A. acknowledges funding from the University of Antwerp Research fund (BOF). We acknowledge Prof. Tom Hauffman and Kitty Baert from the Electrochemical and Surface Engineering research group (SURF) at the VUB (Vrije Universiteit Brussel) for the XPS measurements, Prof. Christophe Vande Velde from the Intelligence in Processes, Advanced Catalysts and Solvents (iPRACS, UAntwerp) research group for the XRD analysis, and Prof. Pegie Cool, Prof. Vera Meynen, and Radu-George Ciocarlan from the Laboratory of Adsorption and Catalysis (LADCA, UAntwerp) for the nitrogen physisorption and Raman spectroscopy measurements. |
Approved |
Most recent IF: 6.4; 2024 IF: NA |
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Call Number |
EMAT @ emat @c:irua:206409 |
Serial |
9261 |
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| Permanent link to this record |
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Author |
Ninakanti, R. |
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Title |
Synthesis and electron microscopy characterization of novel core-shell and self-assembled nanostructures for plasmon-enhanced photocatalysis |
Type |
Doctoral thesis |
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Year |
2024 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
163 p. |
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Keywords |
Doctoral thesis; Engineering sciences. Technology; Electron microscopy for materials research (EMAT); Antwerp engineering, PhotoElectroChemistry & Sensing (A-PECS) |
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Abstract |
The global challenge posed by increasing levels of greenhouse gases and the associated detrimental impacts of global warming necessitate a strategic shift from traditional fossil fuel-based energy systems to more sustainable, renewable, and circular energy and material solutions. Consequently, the potential of photoactive nanoparticles, particularly those that harness light-driven processes, has captured extensive scientific interest as a viable approach to mitigating energy and environmental challenges on a global scale. Although, the adoption of solar light based solutions in the chemical industry has been very less due to sluggish reaction rates and its cascading effects on its economics. The primary focus of this dissertation is the study of plasmonic metal nanoparticles and metal oxide nanoparticles, emphasizing their applications in light-driven energy conversion. The distinctive properties of plasmonic materials, especially surface plasmon resonance (SPR), are pivotal in these applications. SPR involves the oscillation of electron clouds at the surface of nanoparticles when resonating with incident electromagnetic radiation, significantly enhancing solar radiation absorption. This feature is crucial for addressing the limitations of semiconductor photocatalysts like TiO2, which typically exhibit restricted absorption of solar irradiation. The objective of this dissertation is to further optimize the plasmonic enhancement mechanisms by strategically tuning the interactions between plasmonic nanoparticles and TiO2. This is achieved through the development of core-shell nanostructures and the self-assembly of supraparticles, designed to enhance plasmonic photocatalytic systems. The dissertation begins by elucidating the basic concepts and ideations behind the construction of these nanostructures and their roles in enhancing plasmonic photocatalysis, focusing on mechanisms such as near-electric field enhancement, electron transfer, and enhanced photon absorption. To achieve these objectives, modified synthesis techniques were developed to fabricate novel Au@TiO2 core-shell structures with precisely controlled TiO2 shell thickness and self-assembled Au-TiO2 supraparticles with variable sizes. The thesis further delves into the structural characterization of these synthesized nanoparticles, introducing both basic and advanced electron microscopy techniques. For the specific applications of these structures, it was found that Au@TiO2 core-shell nanoparticles with an optimal 4nm TiO2 shell thickness show significant enhancement in the hydrogen evolution reaction. Additionally, the largest Au-TiO2 supraparticles demonstrate superior efficacy in hydrogen peroxide generation. This work not only deepens the scientific understanding of plasmonic materials but also contributes to the development of renewable energy materials. |
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Place of Publication |
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Wos |
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Publication Date |
2024-07-04 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
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ISBN |
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Additional Links |
UA library record |
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Impact Factor |
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Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: NA |
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Call Number |
UA @ admin @ c:irua:206768 |
Serial |
9320 |
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| Permanent link to this record |
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Author |
Liang, Z.; Batuk, M.; Orlandi, F.; Manuel, P.; Hadermann, J.; Hayward, M.A. |
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Title |
Competition between anion-deficient oxide and oxyhydride phases during the topochemical reduction of LaSrCoRuO₆ |
Type |
A1 Journal article |
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Year |
2024 |
Publication |
Inorganic chemistry |
Abbreviated Journal |
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Volume |
63 |
Issue |
28 |
Pages |
12910-12919 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Abstract |
Binary metal hydrides can act as low-temperature reducing agents for complex oxides in the solid state, facilitating the synthesis of anion-deficient oxide or oxyhydride phases. The reaction of LaSrCoRuO6, with CaH2 in a sealed tube yields the face-centered cubic phase LaSrCoRuO3.2H1.9. The reaction with LiH under similar conditions converts LaSrCoRuO6 to a mixture of tetragonal LaSrCoRuO4.8H1.2 and cubic LaSrCoRuO3.3H2.13. The formation of the LaSrCoRuOxHy oxyhydride phases proceeds directly from the parent oxide, with no evidence for anion-deficient LaSrCoRuO6-x intermediates, in contrast with many other topochemically synthesized transition-metal oxyhydrides. However, the reaction between LaSrCoRuO6 and LiH under flowing argon yields a mixture of LaSrCoRuO5 and the infinite layer phase LaSrCoRuO4. The change to all-oxide products when reactions are performed under flowing argon is attributed to the lower hydrogen partial pressure under these conditions. The implications for the reaction mechanism of these topochemical transformations is discussed along with the role of the hydrogen partial pressure in oxyhydride synthesis. Magnetization measurements indicate the LaSrCoRuOxHy phases exhibit local moments on Co and Ru centers, which are coupled antiferromagnetically. In contrast, LaSrCoRuO4 exhibits ferromagnetic behavior with a Curie temperature above 350 K, which can be rationalized on the basis of superexchange coupling between the Co1+ and Ru2+ centers. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001259 |
Publication Date |
2024-06-28 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0020-1669 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS full record |
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Impact Factor |
4.6 |
Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: 4.6; 2024 IF: 4.857 |
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Call Number |
UA @ admin @ c:irua:207018 |
Serial |
9280 |
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Author |
Pedrazo-Tardajos, A.; Claes, N.; Wang, D.; Sánchez-Iglesias, A.; Nandi, P.; Jenkinson, K.; De Meyer, R.; Liz-Marzán, L.M.; Bals, S. |
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Title |
Direct visualization of ligands on gold nanoparticles in a liquid environment |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
Nature Chemistry |
Abbreviated Journal |
Nat. Chem. |
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Volume |
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Issue |
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Pages |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
The interaction among Au nanoparticles, their surface ligands and the solvent critically influences the properties of nanoparticles. Despite employing spectroscopic and scattering techniques to investigate their ensemble structure, a comprehensive understanding at the nanoscale remains elusive. Electron microscopy enables characterization of the local structure and composition but is limited by insufficient contrast, electron beam sensitivity and ultra-high vacuum, which prevent the investigation of dynamic aspects. Here we show that, by exploiting high-quality graphene liquid cells, we can overcome these limitations and investigate the structure of the ligand shell around the Au nanoparticles, as well as the ligand-Au interface in a liquid environment. Using this graphene liquid cell, we visualize the anisotropy, composition and dynamics of ligand distribution at the Au nanorod surface. Our results indicate a micellar model for the surfactant organisation. This work opens up a reliable and direct visualization of ligand distribution around colloidal nanoparticles. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001257 |
Publication Date |
2024-06-27 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1755-4330 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS citing articles; WoS full record |
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Impact Factor |
21.8 |
Times cited |
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Open Access |
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Notes |
S.B., and A.P.-T. acknowledge financial support from the European Commission under the Horizon 2020 Programme by grant no. 731019 (EUSMI) and ERC Consolidator grant no. 815128 (REALNANO). D.W. acknowledges an Individual Fellowship funded by the Marie Sklodowska-Curie Actions (MSCA) in Horizon 2020 program (Grant 894254 SuprAtom). L.L.-M. acknowledges financial support from the European Research Council (ERC Advanced Grant 787510, 4DbioSERS) and the Spanish State Research Agency (Project PID2020-117779RB-I00 and MDM-2017-0720). The authors acknowledge Dr. J. Mosquera and Dr. Jimenez de Aberasturi for provision of samples and useful discussions. |
Approved |
Most recent IF: 21.8; 2024 IF: 25.87 |
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Call Number |
EMAT @ emat @c:irua:207062 |
Serial |
9256 |
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Author |
Arts, I.; Saniz, R.; Baldinozzi, G.; Leinders, G.; Verwerft, M.; Lamoen, D. |
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Title |
Ab initio study of the adsorption of O, O2, H2O and H2O2 on UO2 surfaces using DFT+U and non-collinear magnetism |
Type |
A1 Journal Article |
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Year |
2024 |
Publication |
Journal of Nuclear Materials |
Abbreviated Journal |
Journal of Nuclear Materials |
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Volume |
599 |
Issue |
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Pages |
155249 |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
In order to model correctly the corrosion of spent nuclear fuel under disposal conditions, it is important to understand its behavior in the presence of oxidants. To advance in this direction, we consider the oxidation of UO2. We investigate computationally the adsorption of various species on its three most stable surfaces: (111), (110), and (100), with emphasis on incorporating a full non-collinear PBE+U approach. Various species, namely O, O2, H2O and H2O2 are considered due to their relevance for the oxidation of UO2. The dissociation energy and an estimate for the dissociation barrier for O2 were obtained, using the preferred adsorption configurations of O and O2. The adsorption configurations for H2O in our study compare well with previous studies that used collinear approximations, both in terms of relative stability of configurations and bond lengths. Differences in adsorption energies were found, which may be important for reaction kinetics. Dissociative reactions in which the water molecule splits in hydrogen and hydroxyl occur only on one of the three surfaces. The hydrogen further reacts with a surface oxygen to also form a hydroxyl group. Not surprisingly, we find that H2O2 binds more strongly to the three surfaces than water (lower formation energy), and similar to H2O adsorption, dissociative reactions may occur. The dissociated hydrogen reacts with a surface oxygen to form a hydroxyl group and the hydroperoxyl molecule binds with a surface uranium. Our study, which includes a detailed study of electron transfer, magnetic structure and the preferred adsorption configurations, gives insight into the uranium oxidation states and the influence of surface geometry on adsorption. The findings contribute to a more comprehensive understanding of the early stages of UO2 oxidation. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001262 |
Publication Date |
2024-06-25 |
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Abbreviated Series Title |
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Edition |
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ISSN |
0022-3115 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS full record |
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Impact Factor |
3.1 |
Times cited |
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Open Access |
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Notes |
Financial support for this research was provided by the Energy Transition Fund of the Belgian FPS Economy (Project SF-CORMOD: Spent Fuel – Corrosion modeling). This work was performed using HPC resources from the VSC (Flemish Supercomputer Center) and the HPC infrastructure of the University of Antwerp (CalcUA), both funded by the FWO-Vlaanderen and the Flemish Government department EWI (Economie, Wetenschap & Innovatie). |
Approved |
Most recent IF: 3.1; 2024 IF: 2.048 |
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Call Number |
EMAT @ emat @c:irua:207055 |
Serial |
9249 |
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Author |
Yuan, M.-M.; Wang, L.-D.; Zhang, J.; Ran, M.-J.; Wang, K.; Hu, Z.-Y.; Van Tendeloo, G.; Li, Y.; Su, B.-L. |
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Title |
Cut-off voltage influencing the voltage decay of single crystal lithium-rich manganese-based cathode materials in lithium-ion batteries |
Type |
A1 Journal article |
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Year |
2024 |
Publication |
Journal of colloid and interface science |
Abbreviated Journal |
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Volume |
674 |
Issue |
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Pages |
238-248 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Abstract |
The voltage decay of Li -rich layered oxide cathode materials results in the deterioration of cycling performance and continuous energy loss, which seriously hinders their application in the high-energy – density lithium -ion battery (LIB) market. However, the origin of the voltage decay mechanism remains controversial due to the complex influences of transition metal (TM) migration, oxygen release, indistinguishable surface/bulk reactions and the easy intra/inter-crystalline cracking during cycling. We investigated the direct cause of voltage decay in micrometer -scale single -crystal Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (SC-LNCM) cathode materials by regulating the cut-off voltage. The redox of TM and O 2- ions can be precisely controlled by setting different voltage windows, while the cracking can be restrained, and surface/bulk structural evaluation can be monitored because of the large single crystal size. The results show that the voltage decay of SC-LNCM is related to the combined effect of cation rearrangement and oxygen release. Maintaining the discharge cutoff voltage at 3 V or the charging cutoff voltage at 4.5 V effectively mitigates the voltage decay, which provides a solution for suppressing the voltage decay of Lirich and Mn-based layered oxide cathode materials. Our work provides significant insights into the origin of the voltage decay mechanism and an easily achievable strategy to restrain the voltage decay for Li -rich and Mn-based cathode materials. |
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Wos |
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001261 |
Publication Date |
2024-06-24 |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0021-9797; 1095-7103 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS full record |
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Impact Factor |
9.9 |
Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: 9.9; 2024 IF: 4.233 |
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Call Number |
UA @ admin @ c:irua:207026 |
Serial |
9281 |
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Author |
Vlasov, E. |
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Title |
Exploiting secondary electrons in transmission electron microscopy for 3D characterization of nanoparticle morphologies |
Type |
Doctoral thesis |
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Year |
2024 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
x, 118 p. |
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Keywords |
Doctoral thesis; Electron microscopy for materials research (EMAT) |
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Abstract |
Electron tomography (ET) is an indispensable tool for determining the three-dimensional (3D) structure of nanomaterials in (scanning) transmission electron microscopy ((S)TEM). ET enables 3D characterization of a variety of nanomaterials across different fields, including life sciences, chemistry, solid-state physics, and materials science down to atomic resolution. However, the acquisition of a conventional tilt series for ET is a time-consuming process and thus cannot capture fast transformations of materials in realistic conditions. Moreover, only a limited number of nanoparticles (NPs) can be investigated, hampering a general understanding of the average properties of the material. Therefore, alternative characterization techniques that allow for high-resolution characterization of the surface structure without the need to acquire a full tilt series in ET are required which would enable a more time-efficient investigation with better statistical value. In the first part of this work, an alternative technique for the characterization of the morphology of NPs to improve the throughput and temporal resolution of ET is presented. The proposed technique exploits surface-sensitive secondary electron (SE) imaging in STEM employed using a modification of electron beam-induced current (EBIC) setup. The time- and dose efficiency of SEEBIC are tested in comparison with ET and superior spatial resolution is shown compared to conventional scanning electron microscopy. Finally, contrast artefacts arising in SEEBIC images are described, and their origin is discussed. The second part of my thesis focuses on real applications of the proposed technique and introduces a high-throughput methodology that combines images acquired by SEEBIC with quantitative image analysis to retrieve information about the helicity of gold nanorods. It shows that SEEBIC imaging overcomes the limitation of ET providing a general understanding of the connection between structure and chiroptical properties. |
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Wos |
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Publication Date |
2024-06-17 |
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Edition |
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Additional Links |
UA library record |
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Impact Factor |
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Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: NA |
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Call Number |
UA @ admin @ c:irua:204905 |
Serial |
9149 |
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Author |
Chen, X.; Dong, X.; Zhang, C.; Zhu, M.; Ahmed, E.; Krishnamurthy, G.; Rouzbahani, R.; Pobedinskas, P.; Gauquelin, N.; Jannis, D.; Kaur, K.; Hafez, A.M.E.; Thiel, F.; Bornemann, R.; Engelhard, C.; Schoenherr, H.; Verbeeck, J.; Haenen, K.; Jiang, X.; Yang, N. |
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Title |
Interlayer affected diamond electrochemistry |
Type |
A1 Journal article |
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Year |
2024 |
Publication |
Small methods |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
2301774 |
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Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
Diamond electrochemistry is primarily influenced by quantities of sp3-carbon, surface terminations, and crystalline structure. In this work, a new dimension is introduced by investigating the effect of using substrate-interlayers for diamond growth. Boron and nitrogen co-doped nanocrystalline diamond (BNDD) films are grown on Si substrate without and with Ti and Ta as interlayers, named BNDD/Si, BNDD/Ti/Si, and BNDD/Ta/Ti/Si, respectively. After detailed characterization using microscopies, spectroscopies, electrochemical techniques, and density functional theory simulations, the relationship of composition, interfacial structure, charge transport, and electrochemical properties of the interface between diamond and metal is investigated. The BNDD/Ta/Ti/Si electrodes exhibit faster electron transfer processes than the other two diamond electrodes. The interlayer thus determines the intrinsic activity and reaction kinetics. The reduction in their barrier widths can be attributed to the formation of TaC, which facilitates carrier tunneling, and simultaneously increases the concentration of electrically active defects. As a case study, the BNDD/Ta/Ti/Si electrode is further employed to assemble a redox-electrolyte-based supercapacitor device with enhanced performance. In summary, the study not only sheds light on the intricate relationship between interlayer composition, charge transfer, and electrochemical performance but also demonstrates the potential of tailored interlayer design to unlock new capabilities in diamond-based electrochemical devices. Diamond electrochemistry is revealed to be affected by the interlayers between boron/nitrogen co-doped nanocrystalline diamond (BNDD) film and a Si substrate. A BNDD/Ta/Ti/Si electrode exhibits faster electron transfer processes and smaller electron transfer resistance of redox probes for [Fe(CN)6]3-/4- and [Ru(NH3)6]3+/2+ than the other electrodes, because the interlayer thus determines the intrinsic activity and reaction kinetics of diamond films. image |
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Wos |
001247280600001 |
Publication Date |
2024-06-14 |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2366-9608 |
ISBN |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
12.4 |
Times cited |
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Open Access |
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Notes |
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Approved |
Most recent IF: 12.4; 2024 IF: NA |
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Call Number |
UA @ admin @ c:irua:206567 |
Serial |
9298 |
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Author |
Kadu, A.; Lucka, F.; Batenburg, K.J. |
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Title |
Single-shot tomography of discrete dynamic objects |
Type |
A1 Journal article |
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Year |
2024 |
Publication |
IEEE transactions on computational imaging |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
941-952 |
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Keywords |
A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Abstract |
This paper presents a novel method for the reconstruction of high-resolution temporal images in dynamic tomographic imaging, particularly for discrete objects with smooth boundaries that vary over time. Addressing the challenge of limited measurements per time point, we propose a technique that incorporates spatial and temporal information of the dynamic objects. Our method uses the explicit assumption of homogeneous attenuation values of discrete objects. We achieve this computationally through the application of the level-set method for image segmentation and the representation of motion via a sinusoidal basis. The result is a computationally efficient and easily optimizable variational framework that enables the reconstruction of high-quality 2D or 3D image sequences with a single projection per frame. Compared to variational regularization-based methods using similar image models, our approach demonstrates superior performance on both synthetic and pseudo-dynamic real X-ray tomography datasets. The implications of this research extend to improved visualization and analysis of dynamic processes in tomographic imaging, finding potential applications in diverse scientific and industrial domains. The supporting data and code are provided. |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001256 |
Publication Date |
2024-06-13 |
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ISSN |
2573-0436; 2333-9403 |
ISBN |
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Additional Links |
UA library record; WoS full record; WoS full record |
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Impact Factor |
5.4 |
Times cited |
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Open Access |
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Approved |
Most recent IF: 5.4; 2024 IF: NA |
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Call Number |
UA @ admin @ c:irua:207017 |
Serial |
9315 |
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Author |
Huang, S.; Houwman, E.; Gauquelin, N.; Orekhov, A.; Chezganov, D.; Verbeeck, J.; Hu, S.; Zhong, G.; Koster, G.; Rijnders, G. |
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Title |
Enhanced piezoelectricity by polarization rotation through thermal strain manipulation in PbZr0.6Ti0.4O3 thin films |
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A1 Journal article |
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Year |
2024 |
Publication |
Advanced Materials Interfaces |
Abbreviated Journal |
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Volume |
11 |
Issue |
19 |
Pages |
2400048-2400049 |
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Keywords |
A1 Journal article; Electron microscopy for materials research (EMAT) |
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Abstract |
Lead based bulk piezoelectric materials, e.g., PbZrxTi1-xO3 (PZT), are widely used in electromechanical applications, sensors, and transducers, for which optimally performing thin films are needed. The results of a multi-domain Landau-Ginzberg-Devonshire model applicable to clamped ferroelectric thin films are used to predict the lattice symmetry and properties of clamped PZT thin films on different substrates. Guided by the thermal strain phase diagrams that are produced by this model, experimentally structural transitions are observed. These can be related to changes of the piezoelectric properties in PZT(x = 0.6) thin films that are grown on CaF2, SrTiO3 (STO) and 70% PbMg1/3Nb2/3O3-30% PbTiO3 (PMN-PT) substrates by pulsed laser deposition. Through temperature en field dependent in situ X-ray reciprocal space mapping (RSMs) and piezoelectric force microscopy (PFM), the low symmetry monoclinic phase and polarization rotation are observed in the film on STO and can be linked to the measured enhanced properties. The study identifies a monoclinic -rhombohedral M-C-M-A-R crystal symmetry path as the polarization rotation mechanism. The films on CaF2 and PMN-PT remain in the same symmetry phase up to the ferroelectric-paraelectric phase transition, as predicted. These results support the validity of the multi-domain model which provides the possibility to predict the behavior of clamped, piezoelectric PZT thin films, and design films with enhanced properties. |
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Wos |
001240425700001 |
Publication Date |
2024-06-07 |
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ISSN |
2196-7350 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
5.4 |
Times cited |
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Open Access |
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Most recent IF: 5.4; 2024 IF: 4.279 |
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Call Number |
UA @ admin @ c:irua:206593 |
Serial |
9287 |
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Ding, Y.; Wang, C.; Bandaru, S.; Pei, L.; Zheng, R.; Hau Ng, Y.; Arenas Esteban, D.; Bals, S.; Zhong, J.; Hofkens, J.; Van Tendeloo, G.; Roeffaers, M.B.J.; Chen, L.-H.; Su, B.-L. |
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Title |
Cs3Bi2Br9 nanoparticles decorated C3N4 nanotubes composite photocatalyst for highly selective oxidation of benzylic alcohol |
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A1 Journal Article |
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Year |
2024 |
Publication |
Journal of Colloid and Interface Science |
Abbreviated Journal |
Journal of Colloid and Interface Science |
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Volume |
672 |
Issue |
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Pages |
600-609 |
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Keywords |
A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Abstract |
Solar-light driven oxidation of benzylic alcohols over photocatalysts endows significant prospects in value-added organics evolution owing to its facile, inexpensive and sustainable process. However, the unsatisfactory performance of actual photocatalysts due to the inefficient charge separation, low photoredox potential and sluggish surface reaction impedes the practical application of this process. Herein, we developed an innovative Z-Scheme Cs3BiBr9 nanoparticles@porous C3N4 tubes (CBB-NP@P-tube-CN) heterojunction photocatalyst for highly selective benzyl alcohol oxidation. Such composite combining increased photo-oxidation potential, Z-Scheme charge migration route as well as the structural advantages of porous tubular C3N4 ensures the accelerated mass and ions diffusion kinetics, the fast photoinduced carriers dissociation and sufficient photoredox potentials. The CBB-NP@P-tube-CN photocatalyst demonstrates an exceptional performance for selective photo-oxidation of benzylic alcohol into benzaldehyde with 19, 14 and 3 times higher benzylic alcohols conversion rate than those of C3N4 nanotubes, Cs3Bi2Br9 and Cs3Bi2Br9@bulk C3N4 photocatalysts, respectively. This work offers a sustainable photocatalytic system based on lead-free halide perovskite toward large scale solar-light driven value-added chemicals production. |
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Wos |
001251644100001 |
Publication Date |
2024-06-05 |
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ISSN |
0021-9797 |
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Additional Links |
UA library record; WoS full record; WoS citing articles |
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Impact Factor |
9.9 |
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Notes |
This work is financially supported by the Zhejiang Provincial Natural Science Foundation of China (No. LQ24E020011), and National Natural Science Foundation of China (No. 12374372, 52072101)., Program for Changjiang Scholars and Innovative Research Team in University (IRT_15R52) of the Chinese Ministry of Education and Program of Introducing Talents of Discipline to Universities-Plan 111 (Grant No. B20002) from the Ministry of Science and Technology and the Ministry of Education of China. This research is also supported by the European Commission Interreg V France-Wallonie-Vlaanderen project “DepollutAir”. |
Approved |
Most recent IF: 9.9; 2024 IF: 4.233 |
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Call Number |
EMAT @ emat @c:irua:206675 |
Serial |
9250 |
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Author |
Baral, P.; Kashiwar, A.; Coulombier, M.; Delannay, L.; Hoummada, K.; Raskin, J.P.; Idrissi, H.; Pardoen, T. |
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Title |
Grain boundary-mediated plasticity in aluminum films unraveled by a statistical approach combining nano-DIC and ACOM-TEM |
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A1 Journal article |
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Year |
2024 |
Publication |
Acta materialia |
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Volume |
276 |
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Pages |
120081-14 |
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A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT) |
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Nanomechanical on-chip testing is combined with nanoscale in situ digital image correlation and automated crystal orientation mapping in TEM to deliver novel statistically representative quantitative data about the deformation mechanisms in nanocrystalline aluminum films. The films are very ductile, with a rare stable multiple necking process with local strains reaching up to 0.45 and macroscopic elongation up to 0.17. The strain fields with resolution below 100 nm are related to the underlying microstructure and crystallographic orientation maps. This reveals nanoscopic shear bands forming preferentially along GB with high misorientations, tilted at +/− 45° with respect to loading direction. The analysis of these data prove that the strong strain delocalization process is promoted by GB migration and grain rotation, leading to large strain rate sensitivity. The distribution of misorientation angles between grains evolve during deformation. The GBs with misorientation between 20° and 40°, which are the GBs with highest energy, involve the largest strains. |
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https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=brocade2&SrcAuth=WosAPI&KeyUT=WOS:001258 |
Publication Date |
2024-06-04 |
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ISSN |
1359-6454 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
9.4 |
Times cited |
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Most recent IF: 9.4; 2024 IF: 5.301 |
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Call Number |
UA @ admin @ c:irua:206419 |
Serial |
9294 |
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Author |
Van Gordon, K.; Ni, B.; Girod, R.; Mychinko, M.; Bevilacqua, F.; Bals, S.; Liz‐Marzán, L.M. |
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Single Crystal and Pentatwinned Gold Nanorods Result in Chiral Nanocrystals with Reverse Handedness |
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A1 Journal Article |
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Year |
2024 |
Publication |
Angewandte Chemie International Edition |
Abbreviated Journal |
Angew Chem Int Ed |
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A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ; |
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Handedness is an essential attribute of chiral nanocrystals, having a major influence on their properties. During chemical growth, the handedness of nanocrystals is usually tuned by selecting the corresponding enantiomer of chiral molecules involved in asymmetric growth, often known as chiral inducers. We report that, even using the same chiral inducer enantiomer, the handedness of chiral gold nanocrystals can be reversed by using Au nanorod seeds with either single crystalline or pentatwinned structure. This effect holds for chiral growth induced both by amino acids and by chiral micelles. Although it was challenging to discern the morphological handedness for<italic>L</italic>‐cystine‐directed particles, even using electron tomography, both cases showed circular dichroism bands of opposite sign, with nearly mirrored chiroptical signatures for chiral micelle‐directed growth, along with quasi‐helical wrinkles of inverted handedness. These results expand the chiral growth toolbox with an effect that might be exploited to yield a host of interesting morphologies with tunable optical properties. |
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001230287700001 |
Publication Date |
2024-05-24 |
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ISSN |
1433-7851 |
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Additional Links |
UA library record; WoS full record |
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Impact Factor |
16.6 |
Times cited |
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Notes |
Ana Sánchez-Iglesias is acknowledged for support in the synthesis of pentatwinned gold nanorods. The authors acknowledge financial support by the European Research Council (ERC CoG No. 815128 REALNANO to S.B.), from MCIN/AEI/10.13039/501100011033 (Grant PID2020- 117779RB-I00 to L.M.L.-M and FPI Fellowship PRE2021- 097588 to K.V.G.), and by KU Leuven (C14/22/085). This work has been funded by the European Union under Project 101131111—DELIGHT. Funding for open access charge: Universidade de Vigo/ CRUE-CISUG. |
Approved |
Most recent IF: 16.6; 2024 IF: 11.994 |
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Call Number |
EMAT @ emat @c:irua:206328 |
Serial |
9129 |
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