Preparation and Optical Properties of TiO2-SiO2 thin films by Sol-gel Dipping Method

TiO 2 , SiO 2 and TiO 2 -SiO 2 thin films were prepared by sol-gel dipping method on glass substrates. The pyrolysis behavior of TiO 2 and SiO 2 dry gel were tested by differential thermal analysis (DTA). The microstructure and optical properties of the TiO 2 , SiO 2 and TiO 2 - SiO 2 were studied by X-ray diffraction (XRD) and ultraviolet and visible spectrophotometer. The results showed that the phase structure of the films was affected by the composition. All the films were transparent in the visible region. Meanwhile, the transparency of SiO 2 was better than TiO 2 and TiO 2 -SiO 2 composite film. The ban-gap of the TiO 2 , SiO 2 and TiO 2 -SiO 2 thin films were 3.79, 4.01 and 3.91.