Abstract: Zn doped TiO2/SiO2 thin films were prepared successfully by sol-gel method.To obtain structure properties and micro-topography,these films were characterized by XRD,UV-vis and SEM.The photocatalytic activities of these thin films in the methylene blue were studied.The results show that the titanium dioxide composite films of the anatase phase can be obtained when the Zn2+-TiO2/SiO2 precursors are heated at 500 ℃ for 1h.The films are smooth,compact and uniform.The zinc ions enter the TiO2 crystal lattice to ...