Optical and hydrophilic properties of Cr doped TiO2-SiO2 nanostructure thin film

► The Cr doped TiO2-SiO2 thin film on glass substrate was deposited by a sol gel process. ► Cr doping decreased the band gaps of the TiO2-SiO2 thin film. ► The Cr doped TiO2-SiO2 thin film showed large photocatalytic activity to degradation of methyl orange.