摘要
本文研究了化学还原法制备纳米级Ag粉的高分子保护机理,实验结果显示聚乙烯基吡咯烷酮(PVP)能有效地阻止颗粒团聚并降低Ag晶粒尺寸,得到近单分散200nm以下的Ag粉.PVP的保护机制为:第一步,PVP与Ag^+形成配位键.第二步,配位键促进Ag颗粒成核.第三步,形成大量小晶核使Ag颗粒平均尺寸减小,而PVP吸附在Ag颗粒表面形成位阻效应阻止了颗粒团聚.
Nanometer silver grain growth and particle' s aggregation were effectively prohibited by polyvinyl pirrolidon (PVP) when the silver powder prepared from silver nitride solution reduced by hydrazine hydrate. On the base of ultraviolet spectra and FTIR spectra measurement, PVP protecting mechanisms proposed in this paper were that , first, the coordinative bonds were formed between PVP and silver ions; secondly, a large number of silver embryos were generated during the initial reaction period due to the coordinative bonds formation; and finally, silver embryos and the PVP steric effects were responsible for the inhibited grain growth and the grain aggregation of silver particles.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1996年第4期379-384,共6页
Acta Chimica Sinica
基金
国家教委优秀青年教师基金资助
