Band-gap narrowing of TiO2 doped with Ce probed with x-ray absorption spectroscopy

被引：53

作者：

Chen, S. W. ^{[1
]}

Lee, J. M. ^{[1
]}

Lu, K. T. ^{[1
]}

Pao, C. W. ^{[1
]}

Lee, J. F. ^{[1
]}

Chan, T. S. ^{[1
]}

Chen, J. M. ^{[1
]}

机构：

[1] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 01期

关键词：

cerium; conduction bands; doping; energy gap; photoluminescence; titanium compounds; X-ray absorption spectra; PHOTOCATALYST; NITROGEN; OXIDES; STATES;

D O I：

10.1063/1.3460916

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electronic structure of TiO2 doped with Ce was investigated with x-ray absorption and photoluminescence (PL) spectra. Ce doping narrows the band gap of TiO2, as evidenced by a redshift in the absorption edge in the O K-edge spectrum and PL. Narrowing is ascribed to the formation of an impurity band, composed of Ce 4f (Ce3+/Ce4+) and oxygen defect states, that induces tailing of the conduction band. Band gap narrowing extends the photoactivity of TiO2 to visible light. The impurity band located below the minimum of the conduction band traps excited electrons and suppresses recombination, enhancing the photocatalytic activity. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3460916]

引用

页数：3

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