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\bibitem{Lu_etal2020} {\textquotedblleft}\textit{Spatial heterojunction in nanostructured TiO$_{2}$ and its cascade effect for efficient photocatalysis}{\textquotedblright}. Lu Y, Liu X-L, He L, Zhang Y-X, Hu Z-Y, Tian G, Cheng X, Wu S-M, Li Y-Z, Yang X-H, Wang L-Y, Liu J-W, Janiak C, Chang G-G, Li W-H, Van Tendeloo G, Yang X-Y, Su B-L, Nano Letters \textbf{20}, 3122 (2020).   http://doi.org/10.1021/ACS.NANOLETT.9B05121

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