高频等离子体法制备纳米氧化铋

Preparation of nano-Bi_2O_3 by high-frequency plasma

采用高频等离子体为热源,以普通微米级氧化铋粉体为原料制备高纯氧化铋纳米粉末。用X射线衍射仪、透射电镜和X射线小角散射法（SAXS）对高纯氧化铋纳米粉结构、形貌、粒度及其分布进行表征;用BET吸附法测定比表面积,并测定其红外和紫外吸收性能。结果表明,高频等离子体法制备纳米氧化铋为正方晶系的Bi2O3,中位粒径17.5 nm,粒径范围分布在1~50 nm,比表面积为47.73 m2/g,禁带宽度为2.25 eV。

Micron Bi2O3 powders are used as raw material to produce Bi2O3 nano-powder by high-frequency plasma method.The produced powder was characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM） and small angle X-ray scattering method（SAXS） to determine structure,morphology,particle size and particle size distribution.The specific surface area of the powder was measured using Brunauer-Emmett-Teller（BET） surface area analyser.And its infrared and ultraviolet absorption performance were also tested.The experimental results show that the tetragonal structure of Bi2O3 nano-powder with an median size of 17.5 nm ranging from 1 nm to 50 nm can be produced by high-frequency plasma.The specific surface area is 47.73 m2/g and the energy gap is 2.25 eV.