Unraveling the Origin of Visible Light Capture by Core-Shell TiO2 Nanotubes
學年 104
學期 2
出版（發表）日期 2016-05-24
作品名稱 Unraveling the Origin of Visible Light Capture by Core-Shell TiO2 Nanotubes
作品名稱（其他語言）
著者 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
單位
出版者
著錄名稱、卷期、頁數 Chemistry of Materials 28(12), p.4467-4475
摘要 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).
關鍵字
語言 en_US
ISSN 1520-5002
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 USA
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/108024 )