Phase transition process of Cu-doped TiO₂ nanoparticles

Abstract

Cu-doped TiO2 nanoparticles were synthesized through sol-gel method.X-ray diffraction(XRD), transmission electron microscopy (TEM), scanning transmission electron microscope (STEM), X-ray photoelectron spectroscopy(XPS) and UV-Vis absorption spectrum(UV-Vis) were used to characterize the phase composition, average grain size, morphology of TiO2 nanoparticles, chemical valence states and the optical absorption property of TiO2 nanoparticles. The results show that Cu doping suppresses the phase transition of TiO2. CuO appears on the surface of TiO2 particles at 650℃, and the doped Cu ions are in the form of Cu+. The light absorption bands of Cu-doped TiO2 are red-shifted markedly. The absorbance of the sample increases with the increase of Cu doping amount, and the UV-Vis absorption band is red shifted with the increase of temperature.

Keywords

• TiO₂
• phase transition
• Cu
• doping
• sol-gel method