Study on the electronic structures of the reduced anatase TiO2 by the first-principle calculation |
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Authors: | Zhijun Cheng Tingyu Liu Chenxing Yang Haixiu Gan Feiwu Zhang Jianyu Chen |
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Institution: | 1. College of Science, University of Shanghai for Science and Technology, Shanghai 200093, PR China;2. Nanochemistry Research Institute, Curtin University, G.P.O. Box U1987, Perth, WA 6845, Australia;3. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, PR China |
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Abstract: | Employing the first-principle calculations based on the density functional theory (DFT) and the Molecule Orbital theory (MO), we have researched the electronic structures of the reduced anatase TiO2 and its visible light photoactivity. The study is emphasized on the O vacancy, including the components of the defect states, the relationship with the bulk states and the way in which these electrons occupying the defect states are distributed in the real space. We find that the origin of the visible light photoactivity should be due to the transition of the excited electrons from the defect states σg orbital to the σu orbital in the upper conduction bands, rather than arising from the reduction of the band gap. The calculated results indicate that the localized defect states induced by the neutral and doubly ionized oxygen vacancies are all located in the band gap. |
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