The Size Effect of TiO 2 Anatase Nanoparticles on Photon Correlation Spectroscopy

Abstract

In this work, the anataze phase of TiO 2 nanoparticles was prepared by sol gel method. We changed time and tempera-ture of calcinations to change size and property of nanoparticles. The Transmission Electron Microscopy and Scanning Electron Microscopy were used for characterization of the TiO 2 nanoparticles. The nanoparticle size was increased with time and temperature. We found that the average size of samples was changed from 30 nm to 46 nm with changing tem-perature from 450˚C to 650˚C and at fixed temperature (450˚C) with changing of calcination times from 1 to 3 hours, the size was changed from 30 nm to 58 nm. For study the dynamic of nanoparticles, the TiO 2 nanoparticles were added to water with 2.4 weights present of particles to the water. The different size of TiO 2 nanoparticles was studied with photon correlation spectroscopy. The relaxation time was increased with increasing of nanoparticle size and so diffusion coefficient was decreased.