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ISRN Nanomaterials
Volume 2012 (2012), Article ID 502960, 9 pages
http://dx.doi.org/10.5402/2012/502960
Research Article

Synthesis of High Aspect-Ratio Gold Nanowires with Highly Porous Morphology

School of Chemical and Physical Sciences, Flinders University, Adelaide, SA 5001, Australia

Received 4 April 2012; Accepted 8 May 2012

Academic Editors: S.-H. Kim, W. Lee, and M. Mirzaei

Copyright © 2012 Lucas P. Johnson and Janis G. Matisons. 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

Here, we demonstrate the formation of porous gold nanowires with diameters <60 nm by a two-step process involving the successive electrodeposition of silver then gold into the pores of a track-etched polycarbonate filtration membrane, followed by treatment with nitric acid. The resulting nanowires possess a unique, highly porous morphology, which yields a very high accessible surface area to volume ratio compared to solid nanowires of the same dimensions. Combined with the high aspect ratio of these particles (which allows for easy isolation from solution), this makes them eminently suitable for use in catalysis and sensing applications. The formation of such porous gold nanostructures was ascertained to result from the low diffusivity of the silver species within the narrow membrane pores.