教師資料查詢 | 類別: 期刊論文 | 教師: 彭維鋒 Pong, Way-faung (瀏覽個人網頁)

標題: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
語言英文(美國)
ISSN1520-5002
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式,電子版,紙本
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