Photodecomposition effects of graphene oxide coated on TiO_2 thin film prepared by electron-beam evaporation method

摘要

Morphological, structural and photocatalytic properties of graphene oxide (GO)/TiO_2 thin-film deposited on quartz substrate were investigated. The TiO_2 film was prepared by electron-beam evaporation and the GO film by spin coating method. The photocatalytic activities of the GO/TiO_2 film were evaluated by photodecomposition of methylene blue. There was synergistic effect between TiO_2 and GO which causes a rapid photo-induced charge separation and the reduction of the recombination of electron-hole pairs under the UV-visible light irradiation. GO on TiO_2 film also promotes the properties of adsorption of the dye, photon scattering probability, and interacting surface area. As a result, it leads to the enhancement of the efficiency of the photodegradation in GO/TiO_2 film.