Origin of Photocatalytic Activity of Nitrogen-Doped TiO Nanobelts.
Experiments combined with the density functional theory (DFT) calculation have been performed to understand the underlying photocatalysis mechanism of the nitrogen-doped titania nanobelts. Nitrogen-doped anatase titania nanobelts are prepared via hydrothermal processing and subsequent heat treatment...
| Published in: | Journal of the American Chemical Society Vol. 131; no. 34; pp. 12290 - 12298 |
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| Main Authors: | , , , , , , , |
| Format: | Article |
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American Chemical Society
9/2/2009
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=44230203&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 44230203 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 9/2/2009 vid: 131 iid: 34 pid: 997 pub: American Chemical Society artinfo: ui: 44230203 10.1021/ja903781h ppf: 12290 ppct: 8 formats: tig: atl: Origin of Photocatalytic Activity of Nitrogen-Doped TiO Nanobelts. aug: au: Jin Wang De Nyago Tafen Lewis, James P. Zhanglian Hong Manivannan, Ayyakkannu Mingjia Zhi Ming Li Nianqiang Wu affil: Department of Mechanical and Aerospace Engineering, WVNano Initiative, West Virginia University, Morgantown, West Virginia 26506-6106 Department of Physics, West Virginia University, Morgantown, West Virginia 26506 State Key Laboratory of Silicon Materials, Department of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, P.R. China National Energy Technology Laboratory, U.S. Department of Energy, Morgantown, West Virginia 26507 su: Molecular spectroscopy Photoelectron spectroscopy Molecular orbitals Density functionals Electron spectroscopy Dislocations in crystals sug: subj: Molecular spectroscopy Photoelectron spectroscopy Molecular orbitals Density functionals Electron spectroscopy Dislocations in crystals ab: Experiments combined with the density functional theory (DFT) calculation have been performed to understand the underlying photocatalysis mechanism of the nitrogen-doped titania nanobelts. Nitrogen-doped anatase titania nanobelts are prepared via hydrothermal processing and subsequent heat treatment in NH. Both the nitrogen content and the oxygen vacancy concentration increase with increasing the NH treatment temperature. Nitrogen doping leads to an add-on shoulder on the edge of the valence band, the localized N 2p levels above the valence band maximum, and the 3d states of Ti below the conduction band, which is confirmed by DFT calculation and X-ray photoelectron spectroscopy (XPS) measurement. Extension of the light absorption from the ultraviolet (UV) region to the visible-light region arises from the N 2p levels near the valence band and from the color centers induced by the oxygen vacancies and the Ti species. Nitrogen doping allows visible-light-responsive photocatalytic activity but lowers UV-light-responsive photocatalytic activity. The visible-light photocatalytic activity originates from the N 2p levels near the valence band. The oxygen vacancies and the associated Ti species act as the recombination centers for the photoinduced electrons and holes. They reduce the photocatalytic activity although they contribute to the visible light absorbance. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2009 holdings: @attributes: islocal: N |
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