V2O5-TiO2, SiO2-TiO2 , SiO2-V2O5-TiO2 composite nanometer thin film and TiO2 single thin film on glass substrates were prepared by sol-gel method and dip-coating technique, respectively. The films were characterized by X-ray diffraction (XRD), high-resolution scanning electron microscopy (HRSEM). The hydrophilicity of the films was determined by water contact angles on the films. The results show that the addition of V2O5 to TiO2 thin films could keep good hydrophilicity under sunlight on the TiO2 thin films and make surface morphology of thin films dense and crystalline size decrease. The addition of SiO2 could suppress crystal growth of TiO2 crystal and improve super-hydrophilicity of TiO2 thin films. The contact angle in SiO2-V2O5-TiO2 thin composite films declined with the increase in V2O5 content, declined firstly and then increased with SiO2 content. The dopant of V2O5 on TiO2 thin films could produce a visible-light response to the films, but the addition of SiO2 could not do much help in improving the hydrophilicity.
