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Journal of Nanotechnology
Volume 2009 (2009), Article ID 217469, 7 pages
http://dx.doi.org/10.1155/2009/217469
Research Article

Noncovalent Interaction between Gold Nanoparticles and Multiwalled Carbon Nanotubes via an Intermediatory

1Department of Chemistry and Center for Nanotechnology (CYCU) and R&D Center for Membrane Technology, Chung Yuan Christian University, Chung Li 32023, Taiwan
2Material and Chemical Research Laboratories (ITRI), Industrial Technology Research Institute, HsinChu 310, Taiwan

Received 9 September 2008; Revised 5 January 2009; Accepted 3 February 2009

Academic Editor: Valery N. Khabashesku

Copyright © 2009 Jui-Ming Yeh 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 new and effective method has been developed where self-assembled gold nanoparticles (Au-NPs) of ∼10 nm diameter are successfully attached onto the surface of sidewalls and ends of thiol-terminated multi-walled carbon nanotubes (MWNTs) functionalized with orthomercaptoaniline, acting as a bridging agent. It can bridge the carbon nanotubes (CNTs) and Au-NPs via the bi-functional moiety with benzene unit at one end and thiol group at the other end by self-assembly. The ortho-mercaptoaniline was first grafted onto the surface of the CNTs via - interaction between the benzene ring of the mercaptoaniline and -conjugated body of MWNTs surface to produce thiol-terminated CNTs. The bare surface of Au-NPs facilitates to attach on the thiol group of the thiol-terminated CNTs. Attenuated total reflectance FTIR, UV-visible, Raman spectroscopy and X-ray powder diffraction studies were used to verify whether the mercapto-benzene moieties have been attached to the -conjugated body of functionalized MWNTs. The direct evidence is obtained from transmission electron microscope (TEM) images where self-assembled Au-NPs are attached onto the functionalized MWNTs.