Thermally induced structural changes and optical properties of tin dioxide nanoparticles synthesized by a conventional precipitation method

Abstract

Tin dioxide (SnO2) nanoparticles were synthesized by a conventional precipitation method using the reaction between tin chloride pentahydrate and ammonia solutions. The obtained powders were calcined at varied temperatures from 300 to 1050°C, and then characterized by using thermogravimetric analysis, differential thermal analysis and Fourier transformation infrared spectroscopy. The average crystallite size, determined by x-ray diffraction, was found to be in the range of 3.45–23.5nm. The analysis exhibited a tetragonal phase. The activation energy of crystal growth was calculated and found to be 12.12kJ/mol. The microstructure of nanoparticles was examined by high resolution transmission electron microscopy. Optical properties were investigated by a UV–vis absorption spectrophotometer. The calculated optical band gap lies between 4.75–4.25eV as a result of increasing the calcination temperatures and crystallite size.