CAI Zhenqian, SHEN Qianhong, GAO Jiwei, YANG Hui

(Center for Nano- Science and Technology of Zhejiang Univers ity, Hangzhou 310027)

Abstract: TiO₂/SnO₂ compos ite film prepared by the sol- gel method was depos ited on a s lide glas s subs trate by dip - coating method at low temperature. The influence of different SnO₂ layers on the photocatalytic activity of TiO₂/SnO₂ compos ite film was inves tigated. In addition, the mechanism of the photocatalytic activity enhancement of TiO₂/SnO₂ compos ite film was also analyzed. Since the conduction band (CB) of SnO₂ is lower than that of the TiO₂, the former acts as a s ink for the photogenerated electrons thereby making charge separation more efficient and improving the photocatalytic activity most.

Keywords: TiO₂, SnO₂, photocatalys is , compos ite film