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Journal of Nanotechnology
Volume 2011 (2011), Article ID 408151, 7 pages
http://dx.doi.org/10.1155/2011/408151
Research Article

Spontaneous Ag-Nanoparticle Growth at Single-Walled Carbon Nanotube Defect Sites: A Tool for In Situ Generation of SERS Substrate

1Saskatchewan Structural Sciences Centre, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada S7N 5C9
2College of Pharmacy, University of Saskatchewan, 110 Science Place, Saskatoon, SK, Canada S7N 5C9

Received 31 March 2011; Accepted 4 July 2011

Academic Editor: A. M. Rao

Copyright © 2011 Jason Maley 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

Silver nanoparticles were spontaneously formed on pristine and oxidized single-wall nanotubes. Nanoparticles were observed on carbon nanotubes with AFM, and the presence of Ag nanoparticles were confirmed by ESR experiments. Raman spectroscopy of the Ag-treated carbon nanotubes had a 4–10X enhancement of intensity compared to untreated carbon nanotubes. Ag nanoparticles formed at defect sites on the CNT surface, where free electrons located at the defect sites reduced Ag+ to Ag. A mechanism for the propagation of the nanoparticles is through a continual negative charge generation on the nanoparticle by electron transfer from doublet oxygen (O2).