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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2013,Vol.29>> Issue(06)>> 1305-1312     doi: 10.3866/PKU.WHXB201303182         中文摘要
CATALYSIS AND SURFACE SCIENCE
Structure, Characterization and Photocatalytic Properties of TiO2 Doped with Different Content of Sn4+ Ions
ZHANG Peng1,2, ZHAO Lu Song1,2, YAO Jiang Hong1,2, CAO Ya An1,2
1 College of Physics, Nankai University, Tianjin 300071, P. R. China;
2 Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Teda Applied Physics School, Nankai University, Tianjin 300457, P. R. China
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Pure TiO2 and Sn4+ doped TiO2 (TiO2-Snx%) photocatalysts were prepared by a sol-gel method, where x% represents the nominal molar fraction of Sn4+ ions in the Zr4+ structure. The crystal structure and energy band structure of the resultant catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and surface photovoltage spectroscopy (SPS).The results show that for a low content of Sn4+ ions, the Sn4+ ions are doped into the TiO2 lattice and replace lattice Ti4+ ions in a substitute mode (Ti1-xSnxO2). The energy levels of these Sn4+ ions are located 0.38 eV below the conduction band. Moreover, the rutile SnO2 crystal structure evolves with increasing content of Sn4+ ions, i.e., a TiO2/SnO2 structure is formed. The conduction band of SnO2 is located 0.33 eV lower than that of TiO2. The separation and recombination mechanism of the photo-generated carriers was characterized by photoluminescence and transient photovoltage techniques. The results showed that the formation of the energy levels of Sn4+ ions and the conduction band of rutile SnO2 can enhance the separation of the photogenerated carriers, and suppress the recombination of photo-generated carriers. However, the energy levels of Sn4+ can lead to a much longer life time and higher separation efficiency of the photo-generated carriers. For different content of Sn4+ in Sn4+ ion doped TiO2(TiO2-Snx%), the abovementioned aspects improve the photocatalytic activity.



Keywords: Sn4+-doped TiO2   Content of Sn4+ ions   Transient photovoltage   Surface photovoltage spectroscopy   Life time of photo-generated electrons  
Received: 2012-12-11 Accepted: 2013-03-18 Publication Date (Web): 2013-03-18
Corresponding Authors: Email: caoyaan@yahoo.com

Fund: The project was supported by the National Natural Science Foundation of China (51072082, 21173121, 11074129) and National Key Basic Research Program of China (973) (2012CB934201).

Cite this article: ZHANG Peng, ZHAO Lu Song, YAO Jiang Hong, CAO Ya An. Structure, Characterization and Photocatalytic Properties of TiO2 Doped with Different Content of Sn4+ Ions[J]. Acta Phys. Chim. Sin., 2013,29 (06): 1305-1312.    doi: 10.3866/PKU.WHXB201303182

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