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《Chinese Journal of Catalysis》 2004-05
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Effect of Sm ~(3+) Doping on Photocatalytic Properties of TiO_2 Thin Films

CHEN Juntao*, LI Xinjun*, YANG Ying, WANG Liangyan, HE Mingxing (Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China)  
Sm 3+-doped TiO 2 thin films with different doping modes and Sm contents were prepared by the sol-gel dip-coating technique and characterized by X-ray diffraction, UV-Vis spectroscopy and electrochemical experiment. The photocatalytic activity of the TiO 2 thin films was evaluated by the photocatalytic degradation of methyl orange. XRD results showed that both pure TiO 2 and Sm 3+-doped TiO 2 thin films were of anatase type and oriented predominantly to the (101) plane, and no crystallographic planes of Sm 2O 3 were identified in Sm 3+-doped films. This is due to the low content of the Sm 3+ dopant and the possible incorporation of Sm 3+ into the anatase lattice. A shift of the UV-Vis absorption towards longer wavelength was observed, which indicated a decrease in the band-gap of TiO 2 upon Sm 3+ doping. The electrochemical experiment showed that the open circuit photo-potential of Sm 3+-doped TiO 2 thin films increased compared with the un-doped TiO 2 thin film. The photocatalytic experiment results showed that the Sm 3+ doping content and doping mode were the important factors that affected the photocatalytic activity of TiO 2 thin films. The doping of appropriate amount of Sm improved the photoctalytic activity obviously, and the optimum Sm 3+ content was about 0 5%. The surface doping thin film (Sm-TiO 2(S)) showed the highest catalytic activity. The possible mechanism for the enhancement of the photocatalytic activity of the TiO 2 thin films by Sm 3+ doping was discussed based on PN junction theory.
【Fund】: 广东省自然科学基金重点资助项目 (0 10 873 );; 广东省科技计划基金资助项目 (A3 0 40 3 0 1)
【CateGory Index】: X70
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