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    Title: Unraveling the Origin of Visible Light Capture by Core-Shell TiO2 Nanotubes
    Authors: Li, Jun;Liu, Chang-Hai;Li, Xia;Wang, Zhi-Qiang;Shao, Yu-Cheng;Wang, Sui-Dong;Sun, Xue-Liang;Pong, Way-Faung;Guo, Jing-Hua;Sham, Tsun-Kong
    Date: 2016-05-24
    Issue Date: 2016-10-22 02:10:38 (UTC+8)
    Publisher: American Chemical Society
    Abstract: A black TiO2 nanotube (NT) heterostructure with an anatase-core and an amorphous-shell has been synthesized by NH3 annealing of amorphous NT grown by the anodization of a Ti substrate. Remarkable photoabsorption behavior of these black TiO2 NTs is observed: strong absorption throughout the entire optical wavelength region from ultraviolet to near-infrared. X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS) and resonant inelastic X-ray scattering (RIXS) have been used to elucidate the origin of this spectacular light capture phenomenon. Surface-sensitive XANES recorded in total electron yield and XPS show that the surface layer is amorphous with a chemical composition approaching that of Ti4O7. Bulk-sensitive XANES using X-ray partial fluorescence yield and Ti 2p RIXS confirm the presence of a rich amount of Ti3+ in the crystalline bulk (core of the NT with anatase structure) of black TiO2 NTs, which exhibits a dispersive d-d energy loss at ∼2 eV corresponding to the broad visible light absorption at ∼600 nm. Our results suggest that the extraordinary photoabsorption behavior of these black TiO2 NTs is due to the stabilization of Ti3+ in this special N-doped core–shell assembly having structure varying between TiO2 (bulk anatase) and Ti4O7 (surface, amorphous).
    Relation: Chemistry of Materials 28(12), pp.4467-4475
    DOI: 10.1021/acs.chemmater.6b01673
    Appears in Collections:[物理學系暨研究所] 期刊論文

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