Low-temperature Preparation of TiO2/SnO2 Composite Film and Its Photocatalytic Activity

doi:10.3724/SP.J.1077.2007.00733

Abstract

Abstract: TiO₂/SnO₂ composite films were prepared on a slide glass with a sol-gel method at low temperature. The influence of different dip-coating times of SnO₂ layers on the photocatalytic activity of TiO₂/SnO₂ composite films was investigated. In addition, the mechanism of the photocatalytic activity enhancement of TiO₂/SnO₂
composite film was also analyzed. The results show that the photocatalytic efficiency of TiO₂ film is enhanced by using SnO₂ layer as a substrate. Since the conduction band (CB) of SnO₂ is lower than that of TiO₂, and the valence band(VB) of SnO₂ is higher than that of TiO₂, electrons transfer from TiO₂ to SnO₂, while holes oppositely diffuse into the SnO₂ layer . Thus, the charge recombination is suppressed more efficiently, and more holes can reach the TiO₂ surface to cause oxidation
reaction. This is believed to be the main reason for the photocatalytic activity enhancement of the TiO₂ film photocatalyst.

Key words: titania, tin dioxide, composite film, photocatalysis

CLC Number:

O643

CAI Zhen-Qian,SHEN Qian-Hong,GAO Ji-Wei,YANG Hui. Low-temperature Preparation of TiO₂/SnO₂ Composite Film and Its Photocatalytic Activity[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00733.

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Low-temperature Preparation of TiO₂/SnO₂ Composite Film and Its Photocatalytic Activity

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