纳米银粉的微结构研究

Microstructure of Silver Nanopowders

采用阳极弧放电等离子体法成功制备了银纳米粉体，并利用X射线衍射（XRD）、透射电子显微镜（TEM）和选区电子衍射（SAED）对样品的形貌、晶体结构、粒度及其分布进行性能表征。利用静态表面吸附仪测试样品对N2的吸附-脱附等温线，依据BJH理论模型分析样品的孔结构；利用BET吸附公式计算出样品的比表面积。结果表明：所制备的银纳米粉末的晶体结构与相应的块体材料基本相同，为fcc结构，其粒度主要分布在10～50nm，平均粒度为26nm，比表面积为23．81m^2／g，呈规则的类球形分布。

Silver nanopowders were successfully prepared by an anodic arc discharged plasma in this study. The morphology, crystal structure, particle size and its distribution of the nanopowders were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and the corresponding selected area electron diffraction （SAED）. The N2 absorption-desorption isotherm lines of the samples were measured by using the volumetric absorption analyzer. The pore structure of sample was calculated by BJH academic model and the specific surface area was calculated from the BET adsorption equation. The experimental results show that the fcc crystal structure of the samples is as same as the bulk material; the average size of grain is about 26 nm with a narrow size distribution from 10 nm to 50 nm; the specific surface area is 23.81 m^2/g; distributed uniformly with uniformly quasi-spherical shapes.