Author/Authors :
Ramazani, M Department of Physics - Varamin Pishva Branch, Islamic Azad University, Varamin, Iran , Farahmandjou, M Department of Physics - Varamin Pishva Branch, Islamic Azad University, Varamin, Iran , Firoozabadi, T.P Department of Physics - Varamin Pishva Branch, Islamic Azad University, Varamin, Iran
Abstract :
In this research, TiO2 nanoparticles were synthesized by a simple wet chemical method. TiCl4 was used as precursor in hydrogen
peroxide and ethanol. The TiO2 nanoparticles were characterized by transmission electron microscopy (TEM), scanning electron
microscopy (SEM), X-ray diffraction (XRD), electron dispersive spectroscopy (EDS) and UV-Vis spectrophotometer. The particle size of
the as-synthesized TiO2 was estimated by XRD and TEM analyses in the range of 5-10 nm. The SEM images showed that the size of
sphere-like shaped nanoparticles decrease with increasing annealing temperature. The prepared TiO2 nanoparticles were characterized for
phase composition, using X-ray diffractometry. The crystal structure of the nanoparticles after annealing was measured by XRD analysis. It
was realized that phase transition from anatase to rutile occurs after heat treatment at 600 °C. The particle size of the annealed sample was
also calculated about 20 nm by XRD analysis. The EDS spectrum showed peaks of titanium and oxygen with fewer impurities. The UVVis
spectrum showed anatase and rutile phase at wavelength about 375 nm (Eg = 3.30 eV) and 470 nm (Eg = 2.63 eV) for as-prepared TiO2
and annealed TiO2 nanoparticles respectively.
Keywords :
TiO2 nanocrystals , Wet chemical , Anatase , Phase transition , Rutile
