摘要
为了提高纳米银粉在导体浆料中的分散性以及与基体的结合力,通过直流电弧等离子法制备纳米银粉,并对银粉进行表面改性。利用X射线衍射、X射线荧光分析、热分析、透射电子显微镜等测试手段对样品的晶体结构、成分、形貌和粒径分布进行表征。在测试纳米Ag粉在无水乙醇介质中pH-Zeta电位图的基础上,系统研究了超声时间、不同表面活性剂及其加入量对纳米Ag粉在无水乙醇介质中分散稳定性的影响,并对其分散机理进行了初步探讨。研究表明,直流电弧等离子法制备的纳米银粉纯度高达99.92%(质量比),分散性好,颗粒呈链球型,多晶立方结构。在无水乙醇介质中,推荐较好的纳米Ag粉表面进行改性工艺为:三乙醇胺(TEA)/聚乙烯吡咯烷酮(PVP)复合表面活性剂修饰,其加入量为:2.5%TEA,2.5%PVP,超声70 min,pH值为8。
The silver nano-powder, synthesized by DC arc plasma evaporation in vacuum, were surface modified with appropriate surfactant to improve its dispersion and adhesion at the Agi substrate interface when used as the conductive paste. The Ag nano- powder were characterized with X-ray diffraction, X-ray fluorescence spectroscopy, and transmission electron microscopy. The impacts of the surface modification conditions, including the type and concentration of surfactant and ultrasonic time, on the stability of its dispersion in ethanol solvent were evaluated by means of pH-Zeta potential analysis. The spherical, polycrystalline , cubic- phased Ag nano- powder has a purity of 99 . 92 % （ wt） ,with a narrow size distribution. The Ag powder in alcohol displayed better dispersion, after surface modification under the conditions： the composite surfactant consisting of 2 . 5 % triethanolamine and 2. 5 % polyvinylpyrrolidone, for a ultrasonic time of 70 min, and at apHof8.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2014年第2期186-191,共6页
Chinese Journal of Vacuum Science and Technology
基金
广西科技成果转化与推广计划项目(1298009-15)
江苏省高校优势学科建设工程项目(苏政办发2011-6)
关键词
直流电弧等离子蒸发
纳米银粉
分散
表面改性
DC arc plasma evaporation, Ag nano- particles, Dispersion, Surface modification
