THE SYNTHESIS OFTiO2NANOPARTICLES BY WET-CHEMICAL METHOD AND THEIR PHOTOLUMINESCENCE, THERMAL AND VIBRATIONAL CHARACTERIZATIONS: EFFECT OF GROWTH CONDITION

Abstract

Low temperature calcination methods have been developed to obtain anatase TiO2nanocrystals using three different synthesis routes. The DSC thermograms have been used to set the annealing temperature. Various size of TiO2nanocrystals ranging from 8 nm to 16.5 nm have been used to synthesize by setting up the annealing temperature and time. The X-ray diffraction (XRD) and Raman spectrum have been used to identify and confirm the anatase crystal structure having long range ordering. The photoluminescence (PL) spectra have been recorded as a function of particle size and excitation power, which is attributed to the defects inside the grain that can migrate into the grain surface region during annealing. In a typical TiO2nanocrystals (sample TN12), luminescence efficiency increases with the decrease in size due to e-/ h+recombination process.