摘要
采用自行研制的高真空三枪直流电弧金属纳米粉体连续制备设备,通过控制充气压力制备不同粒径的纳米铋粉。利用X射线衍射(XRD)、透射电子显微镜(TEM)和相应的选区电子衍射(SAED)以及SimplePCI软件等测试手段对样品的成分、晶体结构、形貌和粒径分布进行表征。结果表明:等离子体法制备的纳米铋粉纯度高,粒径分布窄,分散性好,颗粒呈链球状均匀分布;纳米粉体的晶体结构与块体材料相同,为六方结构、空间群R-3m,晶格常数略有增大;当电流恒定为250A、充气压力从5kPa增加到60kPa时,纳米铋粉的平均粒径从35nm增加到143nm。
Bismuth nanoparticles were prepared by controlling the working pressure of self-designed fabricated high-vacuum three-electrode DC arc plasma production apparatus in argon atmosphere. The chemical composition, crystalline structure, morphology, and particle size distribution of the samples were characterized by X-ray diffractometry （XRD）, transmission electron microscopy （TEM）, selected area electron diffractometry （SAED） and simple PCI software. The results indicate that the prepared bismuth nanoparticles have uniform size, high purity, narrow size distribution and spherical shape, and the crystal structure of the samples is the same as that of the bulk materials, being R-3m and rhombohedral structure, a slight expansion in the lattice parameter. The average diameters of bismuth nanoparticles increase from 35 nm to 143 nm when the working pressure is from 5 kPa to 60 kPa at constant electric current of 250 A.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2009年第2期334-338,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(10502025)
江苏省高校自然科学基金资助项目(05KJB1300421)
江苏省火炬计划资助项目(H2007306)
