(1. 中南大学 冶金科学与工程学院,长沙 410083;
2. 长沙职工大学,长沙 410008;
3. 四川大学 原子与分子物理研究所,成都 610065)
摘 要: 采用自悬浮定向流法制备纳米Cu粉;用透射电镜、X射线衍射、紫外?可见光吸收光谱、差示扫描量热?热重法和X射线光电子能谱分析对纳米Cu微晶的形貌、粒度、结构和性能进行研究。研究结果表明:在体积分数为10% He和90% Ar混合气流中和在Ar气流中制备的纳米Cu粒子形貌呈球形,平均粒度分别约为45和60 nm;在590 nm左右有1个很强的吸收峰;纳米Cu粒子表面Cu和O元素的摩尔比为94.88?5.12,有少量氧化亚铜和氧化铜的混合物存在,但在其表面未发现Ar和N。
关键字: 纳米铜粉;微结构;自悬浮定向流法;X射线光电子能谱
nano-copper powders prepared by
flow-levitation method
(1. School of Metallurgical Science and Engineering, Central South University,
Changsha 410083, China;
2. Changsha Workers College, Changsha 410008, China;
3. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China)
Abstract:Nano-copper powders were prepared by flow-levitation method. The morphologies, granularities, structure and properties of nano-Cu particles were investigated by means of transmission electron microscopy, X-ray diffractometry, UV-Visible absorption spectroscopy, thermal analysis techniques and X-ray photoelectron spectroscopy. The results show that the mean granularity of almost-spherical nano-Cu particles are about 45 nm and 60 nm prepared in 10% He and 90% Ar and in Ar, respectively. The maximum specific absorption appears at wavelength of 590 nm. On the surface of the nano-Cu particles, the mole ratio of Cu to O is about 94.88?5.12, and there is a small amount of mixture of Cu2O and CuO, but there are no elements of Ar and N in nano-Cu particles by X-ray photoelectron spectroscopy.
Key words: nano Cu powders; microstructure; flow-levitation method; X-ray photoelectron spectroscopy