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Citation: LI Kui-Ying, GUO Jing, LIU Tong, ZHOU Bing-Jing, LI Yue. Electron Structure and Energy Transformation Mechanism of the Surface of Porous Nanocrystalline TiO₂ Doped with La[J]. Acta Physico-Chimica Sinica, ;2008, 24(11): 2096-2101. doi: 10.3866/PKU.WHXB20081127 shu

Electron Structure and Energy Transformation Mechanism of the Surface of Porous Nanocrystalline TiO₂ Doped with La

1.
National Laboratory of Metastable Materials Manufacture Technology &Science, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China; Department of Environment and Chemical Engineering, Tangshan College, Tangshan 063000, Hebei Province, P. R. China

Received Date: 16 May 2008
Available Online: 17 September 2008

The porous nanocrystalline TiO2 doped with La was synthesized by sol-gel method. The combination of the photoacoustic (PA) and the surface photovoltage (SPV) techniques was proved to be a promising experimental method to probe the photogenic electron behaviors and electron structure on the surface. Results showed that active oxygen and hydroxy were formed on the donor-type active centers produced by the La-O-Ti compounds enriched on the surfaces, which resulted in the sensitized photoreaction of charge transfer transitions on the surface after adsorbing oxygen and H2O. It was experimentally confirmed that doping an appropriate amount of La not only enhanced the surface photovoltage characters of the sample, but also suppressed effectivly the nonradiative transitions, leading to the increased photon efficiency. The charge transfer transitions were dependent closely on the nonradiative transitions, while the formation of active oxygen and hydroxy on the adsorptive surface was independent of the nonradiative transitions.
- Nanocrystalline TiO2 doped with La; Photoacoustic spectroscopy; Surface photovoltaic spectroscopy; Surface electronic structure
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沈阳化工大学材料科学与工程学院沈阳 110142

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Electron Structure and Energy Transformation Mechanism of the Surface of Porous Nanocrystalline TiO2 Doped with La

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通讯作者: 陈斌, bchen63@163.com

Electron Structure and Energy Transformation Mechanism of the Surface of Porous Nanocrystalline TiO₂ Doped with La