Electrochemical preparation and characterization of gold-polyaniline core-shell nanocomposites on highly oriented pyrolytic graphite

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 12; pp. 2314 - 2319
• Main Author: 李年丰 雷霆 刘咏 贺跃辉 张阳德
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2010; Xiangya Hospital, Central South University, Changsha 410008, China; State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China%State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China%Xiangya Hospital, Central South University, Changsha 410008, China
• Subjects: core-shell structure; Covalence; Gold; gold nanoparticles; highly oriented pyrolytic graphite (HOPG); Nanocomposites; Nanoparticles; Particulate composites; polyaniline; Polyanilines; Pyrolytic graphite; Shells; 热解石墨; 电化学制备; 纳米复合材料; 聚苯胺; 高定向裂解石墨; polyaniline; gold nanoparticles; nanocomposites; highly oriented pyrolytic graphite (HOPG); core-shell structure
• ISSN: 1003-6326
• DOI: 10.1016/s1003-6326(10)60647-4

A simple electrochemical method for the in situ preparation of homogeneously dispersed gold-polyaniline core/shell nanocomposite particles with controlled size on the highly oriented pyrolytic graphite（HOPG）was demonstrated.The HOPG surface was modified preferentially by covalent bonding of a two-dimensional 4-aminophenyl monolayer employing diazonium chemistry.AuCl4 -ions were attached to the Ar-NH2 termination and reduced electrochemically.This results in the formation of Au nuclei that could be further grown into gold nanoparticles.The formation of polyaniline as the shell wrap of Au nanoparticle was established by localized electro-polymerization.These core-shell nanocomposites prepared were characterized by AFM and cyclic voltammetry.The results show that the gold-polyaniline core-shell composites on HOPG have a mean particle size of 100 nm in diameter and the polyaniline shell thickness is about 15 nm.