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Journal of Nanomaterials
Volume 2011 (2011), Article ID 354793, 8 pages
http://dx.doi.org/10.1155/2011/354793
Research Article

Synthesis of Gold Nanoanisotrops Using Dioscorea bulbifera Tuber Extract

1Institute of Bioinformatics and Biotechnology, University of Pune, Pune 411007, India
2Department of Electronic Science, Fergusson College, Pune 411004, India
3Garware Research Centre, Department of Chemistry, University of Pune, Pune 411007, India
4Department of Applied Physics, Defence Institute of Advanced Technology, Girinagar, Pune 411025, India
5Department of Microbiology, University of Pune, Pune 411007, India
6Department of Chemical Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India

Received 10 May 2011; Accepted 12 July 2011

Academic Editor: Rakesh Joshi

Copyright © 2011 Sougata Ghosh 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

Biosynthesis of metal nanoparticles employing plant extracts and thereby development of an environmentally benign process is an important branch of nanotechnology. Here, the synthesis of gold nanoparticles using Dioscorea bulbifera tuber extract (DBTE) as the reducing agent is reported. Field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDX), X-ray diffraction (XRD), and UV-visible absorption spectroscopy confirmed the reduction of gold ions to AuNPs. The anisotropic nanoparticles consist of a mixture of gold nanotriangles, nanoprisms, nanotrapezoid, and spheres. The kinetics of particle formation was time dependent and was enhanced by the increase of temperature from 6°C to 50°C, the optimum being 50°C. The optimum concentration of chloroauric acid was found to be 1 mM. Complete reduction of the metal ions within 5 hours by DBTE highlights the development of a novel ecofriendly route of biological synthesis of gold nanoparticles. This is the first paper on synthesis of gold nanoparticles using DBTE.