▎ 摘　　要

This work reports the impact of graphene oxide (GO) on titanium dioxide (TiO2)-based thin films. The obtained data represent a methodical investigation on the physical and dielectric characteristics of TiO2 nanoparticles (NPs) in solution mixed with different volumes of graphene oxide (0, 2, 4, 6 ml) and deposited on a glass substrate by spin coating. Our obtained nanocomposites films were characterized by FTIR, SEM, EDX, XRD, UV-Vis, thermogravimetric analysis and impedance spectroscopy (IS) techniques. The presence and disappearance of functional groups were confirmed by FTIR spectroscopy. SEM images displayed agglomerative surface and a remarkable correspondence between added content, the surface roughness and porosity of the films. The band gap energy of our GO-TiO2 nanocomposites decreased in the range of 3.2-2.2 eV. The impedance spectroscopy analysis revealed a semiconducting behavior of layers after annealing until 150 degrees C. The photocatalytic activities of GO-TiO2 nanocomposite were esteemed by degradation of methyl orange (MO) under UV-irradiation. Our results open up the opportunity for using the GO-TiO2 nanocomposite thin films as promising candidate in solar cells or photovoltaic applications.