Solvothermal synthesis of grain size controlled nanocrystalline SnO2
(1.湖南省长沙市湖南大学化学与化学工程2.湖南省长沙市湖南有色金属研究所3.清华大学 核能与新能源技术研究院, 北京 1000844.湖南省长沙市中南大学粉末治金国家重点实验室5.清华大学 核能与新能源技术研究院，北京100084; 北京分子科学国家实验室，北京 100080)
Abstract: Uniform nanocrystalline SnO2 with different particle sizes was prepared by a solvothermal method using SnCl4×5H2O as the starting material and ethanol as the solvent in the presence of different concentrations of HCl or KOH. The as-prepared powders were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), thermo-gravimetry and differential thermal analysis(TG-DTA), and nitrogen BET measurements. With increasing alkalinity of the precursor solution, the crystallite size of the as-prepared SnO2 nanocrystals decreases from 7.1 nm to 3.2 nm, while the specific surface area of the as-prepared powders increases from 101 m2/g to 195 m2/g. When calcined at 500 ℃ for 2 h in air, the crystallite size of the as-calcined powders increases slightly (12？5.9 nm) and the specific surface area of the as-calcined powders is 42？63 m2/g.
Key words: SnO2; solvothermal synthesis, nanocrystalline particle