Synthesis and characterization of bismuth-doped tin dioxide nanometer powders

来源期刊：中南大学学报(英文版)2006年第5期

论文作者：何秋星 涂伟萍 胡剑青

文章页码：519 - 524

Key words：bismuth-doped tin dioxide; tin dioxide nanometer powders; co-precipitation method; ultrasonic wave

Abstract: Bismuth-doped tin dioxide nanometer powders were prepared by co-precipitation method using SnCl4and Bi(NO₃)₃ as raw materials. The effects of calcining temperature and doping ratio on the particle size, composition,spectrum selectivity of bismuth-doped tin dioxide and the phase transition of Bi-Sn precursor at different temperatures were studied by means of X-ray diffraction, transmission electron microscopy, ultraviolet-visual-near infrared diffuse reflection spectrum and the thermogravimetric-differential scanning calorimetry. The results show that prepared bismuth-doped tin dioxide powders have excellent characteristics with a single-phase tetragonal structure,good dispersibility, good absorbency for ultraviolet ray and average particle size less than 10 nm. The optimum conditions for preparing bismuth-doped tin dioxide nanometer powders are as follows: calcining temperature of 600℃,ratio of bismuth-doped in a range of 0.10 0.30, and Bi-Sn precursor being dispersed by ultrasonic wave and refluxed azeotropic and distillated with mixture ofn-butanol and benzene. The mechanism of phase transition of Bi-Sn precursor is that Bi³⁺enters Sn-vacancy and then forms Sn—O—Bi bond.