关键词: 纳米, 二氧化锡, 超声波, 化学沉淀法

Abstract: The SnO2 nanopowder was prepared by the chemical precipitation reaction of SnCl2·2H2O and NH3·H2O under the action of ultrasonic wave, in which no inclusions were found with a yield approaching theoretical value if controlling pH = 5.0. The structure of SnO2 was transformed from amorphous to crystalline via calcination process, and the calcination temperature affected obviously its grain size which increased with increasing calcination temperature and in accordance to the equation d = 0.2027 t - 30.7750. However, the time for calcination exerts no significant influence on the grain size. It was found preferable that the structure transform of SnO2 nanopowder is calcined at 350°C for 15 min, thus obtaining the spherical crystals about 20 nm.