巯基丙酸保护的纳米银制备及热分解行为研究

摘要

以双官能团配体巯基丙酸(MPA)为保护剂, 通过配体置换法和液相化学还原法制备得到纳米银.考察了双官能团配体对纳米银的制备及热分解的影响.配体置换法制备的纳米银粒径为50 nm左右,化学还原法制备的纳米银粒径为10 nm左右.元素分析结果和X射线光电子能谱表明MPA通过S原子与Ag原子形成共价键,同时通过烷基链之间的氢键作用及范德华力形成多层保护剂保护的纳米银.将纳米银在200 ℃下烧结并对烧结产物进行表征,结果表明加热使得C—S键断裂,Ag/MPA热分解形成硫化银.

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	余明明
	刘东志
	李巍
	周雪琴

关键词：纳米银；保护剂；热分解

Abstract：

In this paper double-function groups ligand-3-mercaptopropionic acid (MPA) was used as protective agent to prepare the silver nanoparticles via ligand exchange and chemical reduction reaction. The effect of double-function ligand on the preparation and thermal decomposition of silver nanoparticles was investigated. Silver nanoparticles with diameter around 50 nm were synthesized by ligand exchange reaction. However, the size of silver nanoparticles prepared by the chemical reduction method is around 10 nm. Elemental analysis and XPS results suggest that the silver nanoparticles protected with multi-layer MPA are obtained by the covalent bond between the sulfur atom and the Ag atom, hydrogen bonding and van der Waals force between alkyl chains. The sintering at 200 ℃ makes the cleavage of C—S bond and the silver nanoparticles decompose to silver sulfide.

Keywords： silver nanoparticles； protective agent； thermal decomposition

Received 2013-05-24;

Fund:

教育部博士点基金项目(20110032110018).

Corresponding Authors: 周雪琴,E-mail: zhouxueqin@tju.edu.cn. Email: zhouxueqin@tju.edu.cn

About author: 余明明(1987-),女,硕士研究生,现从事金属纳米材料的研究.

引用本文:

余明明, 刘东志, 李巍, 周雪琴.巯基丙酸保护的纳米银制备及热分解行为研究[J]. 化学工业与工程, 2015,32(6): 18-21,57

Yu Mingming, Liu Dongzhi, Li Wei, Zhou Xueqin.Preparation and Thermal Decomposition of Silver Nanoparticles Protected with 3-Mercaptopropionic Acid[J]. Chemcial Industry and Engineering, 2015,32(6): 18-21,57

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