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Journal of Nanotechnology
Volume 2012 (2012), Article ID 328565, 8 pages
http://dx.doi.org/10.1155/2012/328565
Research Article

Uniform Decoration of Reduced Graphene Oxide Sheets with Gold Nanoparticles

1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
2Department of physics, Faculty of Science, National University of Singapore, Singapore 117542

Received 11 July 2011; Revised 8 December 2011; Accepted 23 December 2011

Academic Editor: Renu Pasricha

Copyright © 2012 Huanping Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A simple method employing ionic liquid functionalization is developed to achieve the uniform decoration of reduced graphene oxide sheets with gold nanoparticles. The synthesis of ionic liquid modified graphene oxide is accomplished by covalently binding 1-(3-Aminopropyl) imidazole with GO sheets. The formation mechanism of Au nanoparticles on RGO sheets is proposed to load A u C l 4 onto the surface of GO sheets through anion exchange; then reduce A u C l 4 to Au NPs and at the same time reduce GO sheets to RGO sheets via a one-step process. The presence of Au NPs is well identified by SEM, TEM, and XPS. As a concept, the RGO-supported Au NPs is applied to surface-enhanced Raman spectroscopy.