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Author	Xu, T.; Nys, J.-P.; Addad, A.; Lebedev, O.I.; Urbieta, A.; Salhi, B.; Berthe, M.; Grandidier, B.; Stievenard, D.
Title	Faceted sidewalls of silicon nanowires: Au-induced structural reconstructions and electronic properties			Type	A1 Journal article
Year	2010	Publication	Physical review : B : condensed matter and materials physics	Abbreviated Journal	Phys Rev B
Volume	81	Issue	11	Pages	115403,1-115403,10
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Si nanowires with a ⟨111⟩ orientation, synthesized by vapor-liquid-solid process with low silane partial pressure reactant and gold as the catalyst, are known to exhibit sawtooth facets containing gold adsorbates. We report herein the study of the nanowire morphology by means of transmission electron microscopy and scanning tunneling microscopy. The nanowires consist of faceted sidewalls. The number of the sidewalls changes from 12 to 6 along the growth axis, giving rise to nanowires with an irregular hexagonal cross section at their base. The sidewalls are covered with Au-rich clusters. Their facets also exhibit atomic structures that reveal the presence of gold, resulting from the diffusion of gold during the growth. Based on these observations, the tapering of the nanowire is found to be related to two contributions: the reduction in the catalyst particle size during the growth and lateral overgrowth from the direct incorporation of Si species onto the nanowire sidewalls. Because the rearrangement of atoms at surfaces and interfaces might affect the growth kinetics, the trigonal symmetry as well as the higher lateral growth rate on the widest sidewalls are explained from the existence of an interfacial atomic structure with two inequivalent parts in the unit cell. Finally, spectroscopic measurements were performed on the major facets and revealed a metallic behavior at 77 K.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000276248800116	Publication Date	2010-03-03
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1098-0121;1550-235X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.836	Times cited	42	Open Access
Notes				Approved	Most recent IF: 3.836; 2010 IF: 3.774
Call Number	UA @ lucian @ c:irua:82273			Serial	1168
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Author	Bekermann, D.; Gasparotto, A.; Barreca, D.; Bovo, L.; Devi, A.; Fischer, R.A.; Lebedev, O.I.; Maccato, C.; Tondello, E.; Van Tendeloo, G.
Title	Highly oriented ZnO nanorod arrays by a novel plasma chemical vapor deposition process			Type	A1 Journal article
Year	2010	Publication	Crystal growth & design	Abbreviated Journal	Cryst Growth Des
Volume	10	Issue	4	Pages	2011-2018
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Strongly c-axis oriented ZnO nanorod arrays were grown on Si(100) by plasma enhanced-chemical vapor deposition (PE-CVD) starting from two volatile bis(ketoiminato) zinc(II) compounds Zn[(R′)NC(CH3)═C(H)C(CH3)═O]2, with R′ = -(CH2)xOCH3 (x = 2, 3). A systematic investigation of process parameters enabled us to obtain the selective formation of ZnO nanorods with tailored features, and provided an important insight into their growth mechanism. The morphology, structure, and composition of the synthesized ZnO nanosystems were thoroughly analyzed by field emission-scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDXS), glancing incidence X-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Photoluminescence (PL) measurements were carried out to gain information on the optical properties. Specifically, one-dimensional (1D) ZnO architectures could be grown on Si(100) substrates at temperatures as low as 200−300 °C and radio frequency (RF)-power values of 20 W, provided that a sufficiently high mass supply to the growth surface was maintained. To the best of our knowledge, the present work reports the mildest preparation conditions ever appeared in the literature for the PE-CVD of ZnO nanorods, a key result in view of potential large-scale technological applications.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000276234500080	Publication Date	2010-03-18
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1528-7483;1528-7505;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	4.055	Times cited	75	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 4.055; 2010 IF: 4.390
Call Number	UA @ lucian @ c:irua:82311			Serial	1472
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Author	Vlasov, I.I.; Shenderova, O.; Turner, S.; Lebedev, O.I.; Basov, A.A.; Sildos, I.; Rähn, M.; Shiryaev, A.A.; Van Tendeloo, G.
Title	Nitrogen and luminescent nitrogen-vacancy defects in detonation nanodiamond			Type	A1 Journal article
Year	2010	Publication	Small	Abbreviated Journal	Small
Volume	6	Issue	5	Pages	687-694
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	An efficient method to investigate the microstructure and spatial distribution of nitrogen and nitrogen-vacancy (N-V) defects in detonation nanodiamond (DND) with primary particle sizes ranging from approximately 3 to 50 nm is presented. Detailed analysis reveals atomic nitrogen concentrations as high as 3 at% in 50% of diamond primary particles with sizes smaller than 6 nm. A non-uniform distribution of nitrogen within larger primary DND particles is also presented, indicating a preference for location within the defective central part or at twin boundaries. A photoluminescence (PL) spectrum with well-pronounced zero-phonon lines related to the N-V centers is demonstrated for the first time for electron-irradiated and annealed DND particles at continuous laser excitation. Combined Raman and PL analysis of DND crystallites dispersed on a Si substrate leads to the conclusion that the observed N-V luminescence originates from primary particles with sizes exceeding 30 nm. These findings demonstrate that by manipulation of the size/nitrogen content in DND there are prospects for mass production of nanodiamond photoemitters based on bright and stable luminescence from nitrogen-related defects.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000275972400013	Publication Date	2010-01-27
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1613-6810;1613-6829;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	8.643	Times cited	84	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 8.643; 2010 IF: 7.336
Call Number	UA @ lucian @ c:irua:82364			Serial	2341
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Author	Philippaerts, A.; Paulussen, S.; Turner, S.; Lebedev, O.I.; Van Tendeloo, G.; Poelman, H.; Bulut, M.; de Clippel, F.; Smeets, P.; Sels, B.; Jacobs, P.
Title	Selectivity in sorption and hydrogenation of methyl oleate and elaidate on MFI zeolites			Type	A1 Journal article
Year	2010	Publication	Journal of catalysis	Abbreviated Journal	J Catal
Volume	270	Issue	1	Pages	172-184
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	Different zeolites were tested for selective removal of methyl elaidate (trans isomer) from an equimolar mixture with methyl oleate (cis isomer). Sorption experiments of the geometric isomers show that only ZSM-5 samples with reduced Al content in the framework are able to discriminate among the bent cis and the linear trans fatty acid methyl esters. Hydrogenation experiments of equimolar methyl oleate and elaidate mixtures at low temperature (65 °C) and high hydrogen pressure (6.0 MPa), using Pt catalysts, confirm this result. Only with a Pt/NaZSM-5 catalyst outspoken selectivity for the hydrogenation of the trans isomer is obtained. In order to prepare a selective Pt/ZSM-5 catalyst, the influence of Pt addition (impregnation, ion-exchange and competitive ion-exchange) and Pt activation (different calcination and reduction temperatures) on the Pt-distribution and Pt particle size was investigated using SEM, bright-field and HR TEM, EDX, electron tomography, CO-chemisorption, XPS, XRD, and UVvis measurements. The best result in terms of hydrogenation activity and selectivity is obtained with a Pt/ZSM-5 catalyst, which is prepared via competitive ion-exchange, followed by slow calcination up to 350 °C under high O2 flow and a reduction up to 500 °C under H2. This preparation method leads to a Pt/ZSM-5 catalyst with the best Pt distribution and the smallest Pt clusters occluded in the zeolite structure. Finally, the influence of zeolite crystal size, morphology, and elemental composition of ZSM-5 on hydrogenation activity and selectivity was investigated in detail.
Address
Corporate Author				Thesis
Publisher		Place of Publication	San Diego, Calif.	Editor
Language		Wos	000275966100021	Publication Date	2010-01-28
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0021-9517;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.844	Times cited	24	Open Access
Notes	FWO; IAP-IV; Methusalem			Approved	Most recent IF: 6.844; 2010 IF: 5.415
Call Number	UA @ lucian @ c:irua:82435			Serial	2970
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Author	Verlooy, P.L.H.; Robeyns, K.; van Meervelt, L.; Lebedev, O.I.; Van Tendeloo, G.; Martens, J.A.; Kirschhock, C.E.A.
Title	Synthesis and characterization of the new cyclosilicate hydrate (hexamethyleneimine)₄.[Si₈O₁₆(OH)₄].12H₂O			Type	A1 Journal article
Year	2010	Publication	Microporous and mesoporous materials: zeolites, clays, carbons and related materials	Abbreviated Journal	Micropor Mesopor Mat
Volume	130	Issue	1/3	Pages	14-20
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	A new cyclosilicate hydrate with composition (C6H14N)4·[Si8O16(OH)4]·12H2O was crystallized and the structure determined by single-crystal X-ray diffraction. The structure, described by the tetragonal space group I41/a, with unit cell dimensions of a = 39.2150(2) Å and c = 14.1553(2) Å, contains columns of hydrogen-bonded cubic octamer silicate anions. The space between silicate columns holds hydrogen-bonded water and protonated hexamethyleneimine molecules compensating the negative charge of the silicate. The crystal water can be removed resulting in a rearrangement of the columns into orthorhombic symmetry. Removal of the organic moiety causes amorphisation. Flash evacuation results in a new microporous material with pore volumes typical of a zeolite.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000275702600003	Publication Date	2009-10-14
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1387-1811;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.615	Times cited	5	Open Access
Notes				Approved	Most recent IF: 3.615; 2010 IF: 3.220
Call Number	UA @ lucian @ c:irua:82448			Serial	3418
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Author	Lorenz, H.; Zhao, Q.; Turner, S.; Lebedev, O.I.; Van Tendeloo, G.; Klötzer, B.; Rameshan, C.; Penner, S.
Title	Preparation and structural characterization of SnO₂ and GeO₂ methanol steam reforming thin film model catalysts by (HR)TEM			Type	A1 Journal article
Year	2010	Publication	Materials chemistry and physics	Abbreviated Journal	Mater Chem Phys
Volume	122	Issue	2/3	Pages	623-629
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Structure, morphology and composition of different tin oxide and germanium oxide thin film catalysts for the methanol steam reforming (MSR) reaction have been studied by a combination of (high-resolution) transmission electron microscopy, selected area electron diffraction, dark-field imaging and electron energy-loss spectroscopy. Deposition of the thin films on NaCl(0 0 1) cleavage faces has been carried out by thermal evaporation of the respective SnO2 and GeO2 powders in varying oxygen partial pressures and at different substrate temperatures. Preparation of tin oxide films in high oxygen pressures (10−1 Pa) exclusively resulted in SnO phases, at and above 473 K substrate temperature epitaxial growth of SnO on NaCl(0 0 1) leads to well-ordered films. For lower oxygen partial pressures (10−3 to 10−2 Pa), mixtures of SnO and β-Sn are obtained. Well-ordered SnO2 films, as verified by electron diffraction patterns and energy-loss spectra, are only obtained after post-oxidation of SnO films at temperatures T ≥ 673 K in 105 Pa O2. Preparation of GeOx films inevitably results in amorphous films with a composition close to GeO2, which cannot be crystallized by annealing treatments in oxygen or hydrogen at temperatures comparable to SnO/SnO2. Similarities and differences to neighbouring oxides relevant for selective MSR in the third group of the periodic system (In2O3 and Ga2O3) are also discussed with the aim of cross-correlation in formation of nanomaterials, and ultimately, also catalytic properties.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Lausanne	Editor
Language		Wos	000278637900054	Publication Date	2010-04-18
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0254-0584;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.084	Times cited	15	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 2.084; 2010 IF: 2.356
Call Number	UA @ lucian @ c:irua:83099			Serial	2699
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Author	Maignan, A.; Lebedev, O.I.; Van Tendeloo, G.; Martin, C.; Hébert, S.
Title	Negative magnetoresistance in a V³⁺/V⁴⁺ mixed valent vanadate			Type	A1 Journal article
Year	2010	Publication	Applied physics letters	Abbreviated Journal	Appl Phys Lett
Volume	96	Issue	23	Pages	232502,1-232502,3
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The magnetotransport and magnetic properties of the PbV6O11 vanadate, crystallizing in the P63mc space group, reveal the existence of a negative magnetoresistance related to its ferromagnetic state (TC ∼ 90 K). The maximum effect is observed at 20 K reaching −30% in 9 T. The structural study of this ceramic reveals a V/Pb ratio smaller than expected from the formula. This is explained by the presence of numerous stacking faults observed by high resolution transmission electron microscopy. The existence of these planar defects acting as resistive barriers along the c axis could be responsible for tunneling magnetoresistance.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000278695900045	Publication Date	2010-06-08
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-6951;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.411	Times cited		Open Access
Notes				Approved	Most recent IF: 3.411; 2010 IF: 3.841
Call Number	UA @ lucian @ c:irua:83293			Serial	2291
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Author	Barreca, D.; Gasparotto, A.; Lebedev, O.I.; Maccato, C.; Pozza, A.; Tondello, E.; Turner, S.; Van Tendeloo, G.
Title	Controlled vapor-phase synthesis of cobalt oxide nanomaterials with tuned composition and spatial organization			Type	A1 Journal article
Year	2010	Publication	CrystEngComm	Abbreviated Journal	Crystengcomm
Volume	12	Issue	7	Pages	2185-2197
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000279627700040	Publication Date	2010-03-10
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1466-8033;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.474	Times cited	85	Open Access
Notes				Approved	Most recent IF: 3.474; 2010 IF: 4.006
Call Number	UA @ lucian @ c:irua:83686			Serial	503
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Author	Lorenz, H.; Zhao, Q.; Turner, S.; Lebedev, O.I.; Van Tendeloo, G.; Kloetzer, B.; Rameshan, C.; Pfaller, K.
Title	Origin of different deactivation of Pd/SnO₂ and Pd/GeO₂ catalysts in methanol dehydrogenation and reforming: a comparative study			Type	A1 Journal article
Year	2010	Publication	Applied catalysis : A : general	Abbreviated Journal	Appl Catal A-Gen
Volume	381	Issue	1/2	Pages	242-252
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Pd particles supported on SnO2 and GeO2 have been structurally investigated by X-ray diffraction, (High-Resolution) transmission and scanning electron microscopy after different reductive treatments to monitor the eventual formation of bimetallic phases and catalytically tested in methanol dehydrogenation/ reforming. For both oxides this included a thin film sample with well-defined Pd particles and a powder catalyst prepared by incipient wetness impregnation. The hexagonal and the tetragonal polymorph were studied for powder GeO2. Pd2Ge formation was observed on all GeO2-supported catalysts, strongly depending on the specific sample used. Reduction of the thin film at 573K resulted in full transformation into the bimetallic state. The partial solubility of hexagonal GeO2 in water and its thermal structural instability yielded Pd2Ge formation at 473 K, at the cost of a structurally inhomogeneous support and Ge metal formation at higher reduction temperatures. Pd on tetragonal GeO2 entered a state of strong metalsupport interaction after reduction at 573673 K, resulting in coalescing Pd2Ge particles on a sintered and re-crystallized support, apparently partially covering the bimetallic particles and decreasing the catalytic activity. Pd2Ge on amorphous thin film and hexagonal GeO2 converted methanol primarily via dehydrogenation to CO and H2. At 573 K, formation of Pd2Sn and also PdSn occurred on the Pd/SnO2 thin film. Pd3Sn2 (and to some extent Pd2Sn) were predominantly obtained on the respective powder catalyst. Strong deactivation with increasing reduction temperature was observed, likely not based on the classical strong metalsupport interaction effect, but rather on a combination of missing active structural ensembles on Sn-enriched bimetallic phases and the formation of metallic -Sn. Correlations to Pd and its bimetallics supported on ZnO, Ga2O3 and In2O3 were also discussed.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000279100700029	Publication Date	2010-04-26
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0926-860X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	4.339	Times cited	14	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 4.339; 2010 IF: 3.384
Call Number	UA @ lucian @ c:irua:83927			Serial	2522
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Author	Maignan, A.; Lebedev, O.I.; Van Tendeloo, G.; Martin, C.; Hebert, S.
Title	Metal to insulator transition in the n-type hollandite vanadate Pb_1.6V₈O₁₆			Type	A1 Journal article
Year	2010	Publication	Physical review : B : condensed matter and materials physics	Abbreviated Journal	Phys Rev B
Volume	82	Issue	3	Pages	035122, 1-035122,5
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The transport and magnetic measurements of polycrystalline Pb1.6V8O16 hollandite reveal a concomitant metal to insulator and antiferromagnetic transition at TMI≈140 K. A clear localization is found below TMI, evidenced by a rapid increase in the absolute value of the negative Seebeck coefficient. The structural study by x-ray and transmission electron microscopy confirms the hollandite structure and shows that no structural transition occurs at TMI, ruling out a possible charge orbital ordering. The negative Seebeck coefficient observed from 50 K up to 900 K, with values reaching S=−38 μV K−1 at 900 K, is explained by the electron doping of ∼1.4e− in the V empty t2g orbitals responsible for the bad metal resistivity (ρ900 K∼2 mΩ cm). As this S value is close to that obtained by considering only the spin and orbital degeneracies, it is expected that \|S\| for such vanadates will not be sensitive at high temperature to the t2g band filling
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000280366300002	Publication Date	2010-07-27
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1098-0121;1550-235X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.836	Times cited	10	Open Access
Notes				Approved	Most recent IF: 3.836; 2010 IF: 3.774
Call Number	UA @ lucian @ c:irua:84065			Serial	2009
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Author	Gehrke, K.; Moshnyaga, V.; Samwer, K.; Lebedev, O.I.; Verbeeck, J.; Kirilenko, D.; Van Tendeloo, G.
Title	Interface controlled electronic variations in correlated heterostructures			Type	A1 Journal article
Year	2010	Publication	Physical review : B : condensed matter and materials physics	Abbreviated Journal	Phys Rev B
Volume	82	Issue	11	Pages	113101,1-113101,4
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	An interface modification of (LaCa)MnO3-BaTiO3 superlattices was found to massively influence magnetic and magnetotransport properties. Moreover it determines the crystal structure of the manganite layers, changing it from orthorhombic (Pnma) for the conventional superlattice (cSL), to rhombohedral (R3̅ c) for the modified one (mSL). While the cSL shows extremely nonlinear ac transport, the mSL is an electrically homogeneous material. The observations go beyond an oversimplified picture of dead interface layers and evidence the importance of electronic correlations at perovskite interfaces.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000281643200001	Publication Date	2010-09-07
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1098-0121;1550-235X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.836	Times cited	9	Open Access
Notes	This work was supported by DFG via SFB 602, TPA2.			Approved	Most recent IF: 3.836; 2010 IF: 3.774
Call Number	UA @ lucian @ c:irua:84249UA @ admin @ c:irua:84249			Serial	1691
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Author	Bekermann, D.; Gasparotto, A.; Barreca, D.; Devi, A.; Fischer, R.A.; Kete, M.; Štangar, U.L.; Lebedev, O.I.; Maccato, C.; Tondello, E.; Van Tendeloo, G.
Title	ZnO nanorod arrays by plasma-enhanced CVD for light-activated functional applications			Type	A1 Journal article
Year	2010	Publication	ChemPhysChem : a European journal of chemical physics and physical chemistry	Abbreviated Journal	Chemphyschem
Volume	11	Issue	11	Pages	2337-2340
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Switch of the surface properties: Supported ZnO nanorod arrays with tailored roughness and aspect ratios are successfully synthesized by plasma-enhanced chemical vapor deposition. Such nanostructures exhibit significant superhydrophilic and photocatalytic properties tunable as a function of their morphological organization (see picture). This renders them promising building blocks for the fabrication of stimuli-responsive materials.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000281061500008	Publication Date	2010-06-16
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1439-4235;1439-7641;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.075	Times cited	38	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 3.075; 2010 IF: 3.340
Call Number	UA @ lucian @ c:irua:84594			Serial	3935
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Author	Lin, K.; Lebedev, O.I.; Van Tendeloo, G.; Jacobs, P.A.; Pescarmona, P.P.
Title	Titanosilicate beads with hierarchical porosity : synthesis and application as epoxidation catalysts			Type	A1 Journal article
Year	2011	Publication	Chemistry: a European journal	Abbreviated Journal	Chem-Eur J
Volume	16	Issue	45	Pages	13509-13518
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Porous titanosilicate beads with a diameter of 0.51.5 mm (TiSil-HPB-60) were synthesized from a preformed titanosilicate solution with a porous anion-exchange resin as template. The bead format of this material enables its straightforward separation from the reaction mixture in its application as a liquid-phase heterogeneous catalyst. The material displays hierarchical porosity (micro/mesopores) and incipient TS-1 structure building units. The titanium species are predominantly located in tetrahedral framework positions. TiSil-HPB-60 is a highly active catalyst for the epoxidation of cyclohexene with t-butyl hydroperoxide (TBHP) and aqueous H2O2. With both oxidants, TiSil-HPB-60 gave higher epoxide yields than Ti-MCM-41 and TS-1. The improved catalytic performance of TiSil-HPB-60 is mainly ascribed to the large mesopores favoring the diffusion of reagents and products to and from the titanium active sites. The epoxide yield and selectivity could be further improved by silylation of the titanosilicate beads. Importantly, TiSil-HPB-60 is a stable catalyst immune to titanium leaching, and can be easily recovered and reused in successive catalytic cycles without significant loss of activity. Moreover, TiSil-HPB-60 is active and selective in the epoxidation of a wide range of bulky alkenes.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000285398400029	Publication Date	2010-10-07
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0947-6539;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	5.317	Times cited	38	Open Access
Notes	Iap; Goa			Approved	Most recent IF: 5.317; 2011 IF: 5.925
Call Number	UA @ lucian @ c:irua:88153			Serial	3668
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Author	Vernimmen, J.; Guidotti, M.; Silvestre-Albero, J.; Jardim, E.O.; Mertens, M.; Lebedev, O.I.; Van Tendeloo, G.; Psaro, R.; Rodríguez-Reinoso, F.; Meynen, V.; Cool, P.
Title	Immersion calorimetry as a tool to evaluate the catalytic performance of titanosilicate materials in the epoxidation of cyclohexene			Type	A1 Journal article
Year	2011	Publication	Langmuir: the ACS journal of surfaces and colloids	Abbreviated Journal	Langmuir
Volume	27	Issue	7	Pages	3618-3625
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); Laboratory of adsorption and catalysis (LADCA)
Abstract	Different types of titanosilicates are synthesized, structurally characterized, and subsequently catalytically tested in the liquid-phase epoxidation of cyclohexene. The performance of three types of combined zeolitic/mesoporous materials is compared with that of widely studied Ti-grafted-MCM-41 molecular sieve and the TS-1 microporous titanosilicate. The catalytic test results are correlated with the structural characteristics of the different catalysts. Moreover, for the first time, immersion calorimetry with the same substrate molecule as in the catalytic test reaction is applied as an extra means to interpret the catalytic results. A good correlation between catalytic performance and immersion calorimetry results is found. This work points out that the combination of catalytic testing and immersion calorimetry can lead to important insights into the influence of the materials structural characteristics on catalysis. Moreover, the potential of using immersion calorimetry as a screening tool for catalysts in epoxidation reactions is shown.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000288970900054	Publication Date	2011-02-23
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0743-7463;1520-5827;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.833	Times cited	19	Open Access
Notes				Approved	Most recent IF: 3.833; 2011 IF: 4.186
Call Number	UA @ lucian @ c:irua:88366			Serial	1557
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Author	Vernimmen, J.; Meynen, V.; Mertens, M.; Lebedev, O.I.; Van Tendeloo, G.; Cool, P.
Title	Formation of a Ti-siliceous trimodal material with macroholes, mesopores and zeolitic features via a one-pot templating synthesis			Type	A1 Journal article
Year	2012	Publication	Journal of porous materials	Abbreviated Journal	J Porous Mat
Volume	19	Issue	2	Pages	153-160
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); Laboratory of adsorption and catalysis (LADCA)
Abstract	Based on a facile one-pot templating synthesis, using a TS-1 zeolite recipe whereby part of the zeolite structure directing agent is replaced by a mesopore templating agent, a trimodal material is formed. The resulting meso-TSM material combines mesoporosity (Ti-MCM-41) with zeolitic features (TS-1) and a unique sheet-like morphology with uniform macroporous voids (macroholes). Moreover, the macrohole formation, mesoporosity and zeolitic properties of the meso-TSM material can be controlled in a straightforward way by adjusting the length of the hydrothermal treatment. This newly developed material may imply great potential for catalytic redox applications and diffusion limitated processes because of its highly tunable character in all three dimensions (micro-, meso- and macroporous scale).
Address
Corporate Author				Thesis
Publisher	Kluwer Academic	Place of Publication	Boston, Mass.	Editor
Language		Wos	000301187600002	Publication Date	2011-03-28
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1380-2224;1573-4854;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	1.624	Times cited	2	Open Access
Notes	Fwo; Goa			Approved	Most recent IF: 1.624; 2012 IF: 1.348
Call Number	UA @ lucian @ c:irua:88367			Serial	1257
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Author	Philippaerts, A.; Paulussen, S.; Breesch, A.; Turner, S.; Lebedev, O.I.; Van Tendeloo, G.; Sels, B.; Jacobs, P.
Title	Unprecedented shape selectivity in hydrogenation of triacylglycerol molecules with Pt/ZSM-5 zeolite			Type	A1 Journal article
Year	2011	Publication	Angewandte Chemie: international edition in English	Abbreviated Journal	Angew Chem Int Edit
Volume	50	Issue	17	Pages	3947-3949
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Well tuned: ZSM-5 with platinum nanoparticles preferably hydrogenates trans fatty acids over cis isomers in model triacylglycerols for geometric reasons. The central fatty acid chain reacts faster, pointing to pore mouth adsorption in a tuning fork conformation (see picture). This conformation induces stepwise hydrogenation, resulting in fast removal of the unstable central triene, while formation of saturated chains is limited.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000289514100025	Publication Date	2011-03-18
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1433-7851;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	11.994	Times cited	31	Open Access
Notes				Approved	Most recent IF: 11.994; 2011 IF: 13.455
Call Number	UA @ lucian @ c:irua:88381			Serial	3814
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Author	Müller, M.; Turner, S.; Lebedev, O.I.; Wang, Y.; Van Tendeloo, G.; Fischer, R.A.
Title	Au@MOF-5 and Au/Mo_x@MOF-5 (M = Zn, Ti; x = 1, 2) : preparation and microstructural characterisation			Type	A1 Journal article
Year	2011	Publication	European journal of inorganic chemistry	Abbreviated Journal	Eur J Inorg Chem
Volume		Issue	12	Pages	1876-1887
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The Zn-carboxylate-based porous coordination polymer MOF-5 [Zn4O(bdc)3] and the metal oxide loaded materials ZnO@MOF-5 and TiO2@MOF-5 were loaded in a second step with the precursor [ClAuCO] to yield intermediate materials denoted as [ClAuCO]@MOF-5, [ClAuCO]/ZnO@MOF-5 and [ClAuCO]/TiO2@MOF-5. These composites were decomposed to Au@MOF-5, Au/ZnO@MOF-5 and Au/TiO2@MOF-5 under hydrogen at 100 °C. The nanoparticle-loaded hybrid materials were characterised by powder X-ray diffraction (PXRD), IR spectroscopy, X-ray photoelectron spectroscopy (XPS) and N2 sorption measurements, which reveal an intact MOF-5 structure that maintains a high specific surface area. For Au@MOF-5, crystalline Au nanoparticles were distributed over the MOF matrix in a homogeneous fashion with a size of ca. 13 nm, evidenced by high resolution transmission electron microscopy. In the case of Au/ZnO@MOF-5, the Au and metal oxide particles of a few nm in size were coexistent in a given volume of the MOF-5 matrix and were not separated in different crystalline MOF particles. For the TiO2 loaded materials the oxide is preferentially located near the outer surface of the MOF particles, leading to an increase of larger exterior Au particles in comparison to very small interior Au particles as observed for the other materials. Au@MOF-5, Au/ZnO@MOF-5 and Au/TiO2@MOF-5 were tested in liquid-phase oxidation of alcohols. Preliminary results show a high activity for the Au loaded materials in this reaction. This observation is attributed to the microstructure of the composites with very small Au particles distributed homogeneously over the MOF matrix.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000289644300004	Publication Date	2011-03-09
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1434-1948;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.444	Times cited	75	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 2.444; 2011 IF: 3.049
Call Number	UA @ lucian @ c:irua:88644			Serial	205
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Author	Lebedev, O.I.; Caignaert, V.; Raveau, B.; Pop, N.; Gozzo, F.; Van Tendeloo, G.; Pralong, V.
Title	HRTEM and neutron diffraction study of Li_xMo₅O₁₇ : from the ribbon (x=5) structure to the rock salt (x=12) structure			Type	A1 Journal article
Year	2011	Publication	Journal of solid state chemistry	Abbreviated Journal	J Solid State Chem
Volume	184	Issue	4	Pages	790-796
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Structure determination of the fully intercalated phase Li12Mo5O17 and of the deintercalated oxide Li5Mo5O17 has been carried out by electron microscopy and neutron powder diffraction. The reversible topotactic transformation between the ordered rock salt structure of the former and the ribbon structure of the latter (closely related to that of Li4Mo5O17) is explained on the following basis: both structures can be described as strips built up as an assembly of infinite ribbons of MoO6 octahedra that are five octahedra thick, and that differ by slight displacements of the octahedral ribbons. We show that the electrochemical behavior of the LixMo5O17 system is based on two sorts of Li+ sites; those that are located within the strips between the ribbons, and those that are located at the border of the strips. The high rate of Li intercalation in this oxide and its reversibility are discussed in terms of its peculiar structure.
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000289597100010	Publication Date	2011-02-12
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0022-4596;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.299	Times cited	1	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 2.299; 2011 IF: 2.159
Call Number	UA @ lucian @ c:irua:88646			Serial	1515
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Author	Gélard, J.; Jehanathan, N.; Roussel, H.; Gariglio, S.; Lebedev, O.I.; Van Tendeloo, G.; Dubourdieu, C.
Title	Off-stoichiometry effects on the crystalline and defect structure of hexagonal manganite REMnO₃ films (RE = Y, Er, Dy)			Type	A1 Journal article
Year	2011	Publication	Chemistry of materials	Abbreviated Journal	Chem Mater
Volume	23	Issue	5	Pages	1232-1238
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The crystalline and defect structure of epitaxial hexagonal RExMnyO3 (RE = Er, Dy) films with varying cationic composition was investigated by X-ray diffraction and transmission electron microscopy. The films are composed of a strained layer at the interface with the substrate and of a relaxed layer on top of it. The critical thickness is of 10 to 25 nm. For Mn-rich films (or RE deficient), an off-stoichiometric composition maintaining the hexagonal LuMnO3-type structure is stabilized over a large range of the RE/Mn ratio (0.72−1.00), with no Mn-rich secondary phases observed. A linear dependence of the out-of-plane lattice parameter with RE/Mn is observed in this range. Out-of-phase boundary (OPB) extended defects are observed in all films and exhibit a local change in stoichiometry. Such a large solubility limit in the RE deficient region points toward the formation of vacancies on the RE site (RExMnO3−δ, with 0.72 ≤ x < 1), a phenomenon that is encountered in perovskite manganites such as LaxMnO3−δ (x < 1) and that may strongly impact the physical properties of hexagonal manganites.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000287767200022	Publication Date	2011-02-03
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0897-4756;1520-5002;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	9.466	Times cited	17	Open Access
Notes				Approved	Most recent IF: 9.466; 2011 IF: 7.286
Call Number	UA @ lucian @ c:irua:88649			Serial	2430
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Author	Barreca, D.; Carraro, G.; Gasparotto, A.; Maccato, C.; Lebedev, O.I.; Parfenova, A.; Turner, S.; Tondello, E.; Van Tendeloo, G.
Title	Tailored vapor-phase growth of Cu_xO-TiO₂(x=1,2) nanomaterials decorated with Au particles			Type	A1 Journal article
Year	2011	Publication	Langmuir: the ACS journal of surfaces and colloids	Abbreviated Journal	Langmuir
Volume	27	Issue	10	Pages	6409-6417
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	We report on the fabrication of CuxOTiO2 (x = 1, 2) nanomaterials by an unprecedented vapor-phase approach. The adopted strategy involves the growth of porous CuxO matrices by means of chemical vapor deposition (CVD), followed by the controlled dispersion of TiO2 nanoparticles. The syntheses are performed on Si(100) substrates at temperatures of 400550 °C under wet oxygen atmospheres, adopting Cu(hfa)2·TMEDA (hfa =1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; TMEDA = N,N,N′,N′-tetramethylethylenediamine) and Ti(O-iPr)2(dpm)2 (O-iPr = isopropoxy; dpm = 2,2,6,6-tetramethyl-3,5-heptanedionate) as copper and titanium precursors, respectively. Subsequently, finely dispersed gold nanoparticles are introduced in the as-prepared systems via radio frequency (RF)-sputtering under mild conditions. The synthesis process results in the formation of systems with chemical composition and nano-organization strongly dependent on the nature of the initial CuxO matrix and on the deposited TiO2 amount. The decoration with low-size gold clusters paves the way to the engineering of hierarchically organized nanomaterials.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000290292900082	Publication Date	2011-04-25
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0743-7463;1520-5827;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.833	Times cited	36	Open Access
Notes	Fwo			Approved	Most recent IF: 3.833; 2011 IF: 4.186
Call Number	UA @ lucian @ c:irua:88940			Serial	3467
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Author	Wouters, J.; Lebedev, O.I.; Van Tendeloo, G.; Yamada, H.; Sato, N.; Vanacken, J.; Moshchalkov, V.V.; Verbiest, T.; Valev, V.K.
Title	Preparing polymer films doped with magnetic nanoparticles by spin-coating and melt-processing can induce an in-plane magnetic anisotropy			Type	A1 Journal article
Year	2011	Publication	Journal of applied physics	Abbreviated Journal	J Appl Phys
Volume	109	Issue	7	Pages	076105-076105,3
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Faraday rotation has been used to investigate a series of polymer films doped with magnetic iron oxide nanoparticles. The films have been prepared by spin-coating and melt-processing. In each case, upon varying the angle of optical incidence on the films, an in-plane magnetic anisotropy is observed. The effect of such an anisotropy on the Faraday rotation as a function of the angle of optical incidence is verified by comparison with magnetically poled films. These results demonstrate that care should be taken upon analyzing the magnetic behavior of such films on account of the sample preparation techniques themselves being able to affect the magnetization.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000289949000166	Publication Date	2011-04-12
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0021-8979;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.068	Times cited	10	Open Access
Notes	Fwo; Iap; Iwt			Approved	Most recent IF: 2.068; 2011 IF: 2.168
Call Number	UA @ lucian @ c:irua:89917			Serial	2709
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Author	Hezareh, T.; Razavi, F.S.; Kremer, R.K.; Habermeier, H.-U.; Lebedev, O.I.; Kirilenko, D.; Van Tendeloo, G.
Title	Effect of PbZr_0.52Ti_0.48O₃ thin layer on structure, electronic and magnetic properties of La_0.65Sr_0.35MnO₃ and La_0.65Ca_0.30MnO₃ thin-films			Type	A1 Journal article
Year	2011	Publication	Journal of applied physics	Abbreviated Journal	J Appl Phys
Volume	109	Issue	11	Pages	113707,1-113707,8
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Epitaxial thin film heterostructures of high dielectric PbZr<sub>1-x</sub>Ti<sub>x</sub>O<sub>3</sub> (PZT) and La<sub>1-x</sub>A<sub>x</sub>MnO<sub>3</sub> (A-divalent alkaline earth metals such as Sr (LSMO) and Ca (LCMO)) were grown on SrTiO<sub>3</sub> substrates and their structure, temperature dependence of electrical resistivity, and magnetization were investigated as a function of the thickness of the LSMO(LCMO) layer. The microstructures of the samples were analyzed by TEM. By applying an electric field across the PZT layer, we applied a ferrodistortive pressure on the manganite layer and studied the correlations between lattice distortion and electric transport and magnetic properties of the CMR materials.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000292214700069	Publication Date	2011-06-06
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0021-8979;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.068	Times cited	4	Open Access
Notes				Approved	Most recent IF: 2.068; 2011 IF: 2.168
Call Number	UA @ lucian @ c:irua:90964			Serial	843
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Author	Vernimmen, J.; Meynen, V.; Herregods, S.J.F.; Mertens, M.; Lebedev, O.I.; Van Tendeloo, G.; Cool, P.
Title	New insights in the formation of combined zeolitic/mesoporous materials by using a one-pot templating synthesis			Type	A1 Journal article
Year	2011	Publication	European journal of inorganic chemistry	Abbreviated Journal	Eur J Inorg Chem
Volume		Issue	27	Pages	4234-4240
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); Laboratory of adsorption and catalysis (LADCA)
Abstract	Zeolitic growth is often absent or occurs in separate phases when synthetic strategies based on the combination of zeolite templates and mesopore templating agents are applied. In this work, zeolitic growth and mesopore formation have been investigated at different temperatures by applying a one-pot templating approach, based on a TS-1 zeolite synthesis whereby part of the microtemplate (tetrapropylammonium hydroxide, TPAOH) is replaced by a mesotemplate (hexadecyltrimethylammonium bromide, CTMABr). Moreover, the synthesis duration and the molar ratio of the microtemplate/mesotemplate have also been studied. The different syntheses clearly show the inherent competitive mechanism between zeolitic growth and mesopore formation. These insights have led to the conclusion that by following a one-pot templating strategy with standard, nonexotic commercial templates, i.e. CTMABr and TPAOH, it is not possible to develop a true hierarchical mesoporous zeolite, meaning a mesoporous siliceous material with highly crystalline zeolitic walls. The resultant materials are instead combined zeolitic/mesoporous composite structures with, however, highly tuneable and controllable porosity characteristics.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000296143500014	Publication Date	2011-08-17
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1434-1948;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.444	Times cited	7	Open Access
Notes	Fwo			Approved	Most recent IF: 2.444; 2011 IF: 3.049
Call Number	UA @ lucian @ c:irua:91574			Serial	2315
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Author	Kalkert, C.; Krisponeit, J.-O.; Esseling, M.; Lebedev, O.I.; Moshnyaga, V.; Damaschke, B.; Van Tendeloo, G.; Samwer, K.
Title	Resistive switching at manganite/manganite interfaces			Type	A1 Journal article
Year	2011	Publication	Applied physics letters	Abbreviated Journal	Appl Phys Lett
Volume	99	Issue	13	Pages	132512-132512,3
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	We report bipolar resistive switching between the interfaces of manganite nanocolumns. La0.7Sr0.3MnO3 films were prepared on Al2O3 substrates, where the films grow in nanocolumns from the substrate to the surface. Conductive atomic force microscopy directly detects that the resistive switching is located at the boundaries of the grains. Furthermore, mesoscopic transport measurements reveal a tunnel magnetoresistance. In combination with the resistive switching, this leads to a total of four different resistive states.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000295618000052	Publication Date	2011-09-29
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-6951;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.411	Times cited	10	Open Access
Notes				Approved	Most recent IF: 3.411; 2011 IF: 3.844
Call Number	UA @ lucian @ c:irua:91884			Serial	2881
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Author	Simon, Q.; Barreca, D.; Bekermann, D.; Gasparotto, A.; Maccato, C.; Comini, E.; Gombac, V.; Fornasiero, P.; Lebedev, O.I.; Turner, S.; Devi, A.; Fischer, R.A.; Van Tendeloo, G.
Title	Plasma-assisted synthesis of Ag/ZnO nanocomposites : first example of photo-induced H₂ production and sensing			Type	A1 Journal article
Year	2011	Publication	International journal of hydrogen energy	Abbreviated Journal	Int J Hydrogen Energ
Volume	36	Issue	24	Pages	15527-15537
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Ag/ZnO nanocomposites were developed by a plasma-assisted approach. The adopted strategy exploits the advantages of Plasma Enhanced-Chemical Vapor Deposition (PE-CVD) for the growth of columnar ZnO arrays on Si(100) and Al2O3 substrates, in synergy with the infiltration power of the Radio Frequency (RF)-sputtering technique for the subsequent dispersion of different amounts of Ag nanoparticles (NPs). The resulting composites, both as-prepared and after annealing in air, were thoroughly characterized with particular attention on their morphological organization, structure and composition. For the first time, the above systems have been used as catalysts in the production of hydrogen by photo-reforming of alcoholic solutions, yielding a stable H2 evolution even by the sole use of simulated solar radiation. In addition, Ag/ZnO nanocomposites presented an excellent response in the gas-phase detection of H2, opening attractive perspectives for advanced technological applications.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Oxford	Editor
Language		Wos	000297089700006	Publication Date	2011-10-14
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0360-3199;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.582	Times cited	62	Open Access
Notes	Esteem 026019; Fwo			Approved	Most recent IF: 3.582; 2011 IF: 4.054
Call Number	UA @ lucian @ c:irua:91901			Serial	2627
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Author	Gasparotto, A.; Barreca, D.; Bekermann, D.; Devi, A.; Fischer, R.A.; Fornasiero, P.; Gombac, V.; Lebedev, O.I.; Maccato, C.; Montini, T.; Van Tendeloo, G.; Tondello, E.
Title	F-doped Co₃O₄ photocatalysts for sustainable H₂ generation from water/ethanol			Type	A1 Journal article
Year	2011	Publication	Journal of the American Chemical Society	Abbreviated Journal	J Am Chem Soc
Volume	133	Issue	48	Pages	19362-19365
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	p-Type Co3O4 nanostructured films are synthesized by a plasma-assisted process and tested in the photocatalytic production of H2 from water/ethanol solutions under both near-UV and solar irradiation. It is demonstrated that the introduction of fluorine into p-type Co3O4 results in a remarkable performance improvement with respect to the corresponding undoped oxide, highlighting F-doped Co3O4 films as highly promising systems for hydrogen generation. Notably, the obtained yields were among the best ever reported for similar semiconductor-based photocatalytic processes.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000297606500027	Publication Date	2011-11-04
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0002-7863;1520-5126;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	13.858	Times cited	114	Open Access
Notes				Approved	Most recent IF: 13.858; 2011 IF: 9.907
Call Number	UA @ lucian @ c:irua:93628			Serial	1164
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Author	Afanasov, I.M.; Lebedev, O.I.; Kolozhvary, B.A.; Smirnov, A.V.,; Van Tendeloo, G.
Title	Nickel/carbon composite materials based on expanded graphite			Type	A1 Journal article
Year	2011	Publication	New carbon materials	Abbreviated Journal
Volume	26	Issue	5	Pages	335-340
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Monolithic nickel/carbon (Ni/C) composites were prepared from coal tar pitch-impregnated compressed expanded graphite pre-decorated with NiO particles (EGNiO) by pyrolysis at 550 °C and subsequent steam activation at 800 °C. The microstructural arrangement of the Ni-comprising nanoparticles in the composites was investigated using transmission electron microscopy. The specific surface area and porosity of the composites were analyzed by nitrogen adsorption. The catalytic activity of the composites was compared with the material obtained by the conventional H2 treatment of EGNiO using hydrocracking of 2,2,3-trimethylpentane as a model reaction.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000296926500003	Publication Date	2011-11-12
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1872-5805;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor		Times cited	7	Open Access
Notes	Iap			Approved	Most recent IF: NA
Call Number	UA @ lucian @ c:irua:93633			Serial	2340
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Author	Ray, S.; Kolen'ko, Y.V.; Kovnir, K.A.; Lebedev, O.I.; Turner, S.; Chakraborty, T.; Erni, R.; Watanabe, T.; Van Tendeloo, G.; Yoshimura, M.; Itoh, M.
Title	Defect controlled room temperature ferromagnetism in Co-doped barium titanate nanocrystals			Type	A1 Journal article
Year	2012	Publication	Nanotechnology	Abbreviated Journal	Nanotechnology
Volume	23	Issue	2	Pages	025702,1-025702,10
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Defect mediated high temperature ferromagnetism in oxide nanocrystallites is the central feature of this work. Here, we report the development of room temperature ferromagnetism in nanosized Co-doped barium titanate particles with a size of around 14 nm, synthesized by a solvothermal drying method. A combination of x-ray diffraction with state-of-the-art electron microscopy techniques confirms the intrinsic doping of Co into BaTiO3. The development of the room temperature ferromagnetism was tracked down to the different donor defects, namely hydroxyl groups at the oxygen site (\mathrm {OH}_{\mathrm {(O)}}
Address
Corporate Author				Thesis
Publisher		Place of Publication	Bristol	Editor
Language		Wos	000298409000011	Publication Date	2011-12-14
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0957-4484;1361-6528;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.44	Times cited	19	Open Access
Notes	Esteem 026019; Fwo			Approved	Most recent IF: 3.44; 2012 IF: 3.842
Call Number	UA @ lucian @ c:irua:93636			Serial	614
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Author	Gao, J.; Lebedev, O.I.; Turner, S.; Li, Y.F.; Lu, Y.H.; Feng, Y.P.; Boullay, P.; Prellier, W.; Van Tendeloo, G.; Wu, T.
Title	Phase selection enabled formation of abrupt axial heterojunctions in branched oxide nanowires			Type	A1 Journal article
Year	2012	Publication	Nano letters	Abbreviated Journal	Nano Lett
Volume	12	Issue	1	Pages	275-280
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Rational synthesis of nanowires via the vaporliquidsolid (VLS) mechanism with compositional and structural controls is vitally important for fabricating functional nanodevices from bottom up. Here, we show that branched indium tin oxide nanowires can be in situ seeded in vapor transport growth using tailored AuCu alloys as catalyst. Furthermore, we demonstrate that VLS synthesis gives unprecedented freedom to navigate the ternary InSnO phase diagram, and a rare and bulk-unstable cubic phase can be selectively stabilized in nanowires. The stabilized cubic fluorite phase possesses an unusual almost equimolar concentration of In and Sn, forming a defect-free epitaxial interface with the conventional bixbyite phase of tin-doped indium oxide that is the most employed transparent conducting oxide. This rational methodology of selecting phases and making abrupt axial heterojunctions in nanowires presents advantages over the conventional synthesis routes, promising novel composition-modulated nanomaterials.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington	Editor
Language		Wos	000298943100048	Publication Date	2011-12-05
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1530-6984;1530-6992;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	12.712	Times cited	25	Open Access
Notes	Fwo			Approved	Most recent IF: 12.712; 2012 IF: 13.025
Call Number	UA @ lucian @ c:irua:94209			Serial	2587
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Author	Abakumov, A.M.; Alekseeva, A.M.; Rozova, M.G.; Antipov, E.V.; Lebedev, O.I.; Van Tendeloo, G.
Title	Ordering of tetrahedral chains in the Sr₂MnGaO₅ brownmillerite			Type	A1 Journal article
Year	2003	Publication	Journal of solid state chemistry	Abbreviated Journal	J Solid State Chem
Volume	174	Issue	2	Pages	319-328
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Tetrahedral chain ordering in the Sr2MnGaO5 structure is studied using electron diffraction (ED) and high-resolution electron microscopy. The ED patterns show the presence of satellite reflections, which indicate a commensurately modulated structure with a = 5.4056(8) Angstrom b 16.171(3) Angstrom, c = 5.5592(7) Angstrom, q – 1/2c*, superspace group Immma(00gamma,)s00. The Superstructure arises due to ordering of the two types of symmetry related tetrahedral chains (L and R) according to a ... LRLR ... sequence, where L and R chains alternate along the c-axis within the same (GaO) layer. Numerous defects at different structural levels were observed, comprising interleaving L and R chains, violation of the ... LRLR ... chain sequence within one layer, different stacking modes of the ... LRLR ... ordered layers with subsequent alternation of blocks of different width along the h-axis of the brownmillerite subcell and island fragmentation of the modulated superstructure. By in situ heating ED experiments it is found that the long-range ordering of the tetrahedral chains is stable tip to 665degreesC and is completely suppressed at 905degreesC. (C) 2003 Elsevier Inc. All rights reserved.
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Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000185180500011	Publication Date	2003-07-22
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0022-4596;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.299	Times cited	34	Open Access
Notes				Approved	Most recent IF: 2.299; 2003 IF: 1.413
Call Number	UA @ lucian @ c:irua:94846			Serial	2506
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