About this Journal Submit a Manuscript Table of Contents
Journal of Nanotechnology
Volume 2014 (2014), Article ID 304526, 7 pages
http://dx.doi.org/10.1155/2014/304526
Research Article

Graphene/Gold Nanocomposites-Based Thin Films as an Enhanced Sensing Platform for Voltammetric Detection of Cr(VI) Ions

Centre for Nanotechnology Research, VIT University, Vellore 632 014, India

Received 31 July 2013; Revised 15 November 2013; Accepted 23 December 2013; Published 5 February 2014

Academic Editor: Carlos R. Cabrera

Copyright © 2014 Chella Santhosh 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 highly sensitive and selective Cr(VI) sensor with graphene-based nanocomposites film as an enhanced sensing platform is reported. The detection of chromium species is a challenging task because of the different possible oxidation states in which the element can occur. The sensing film was developed by homogenously distributing Au nanoparticles (AuNPs) onto the two-dimensional (2D) graphene nanosheet matrix by electrochemical method. Such nanostructured composite film platforms combine the advantages of AuNPs and graphene nanosheets because of the synergistic effect between them. This effect greatly facilitates the electron-transfer processes and the sensing behavior for Cr(VI) detection, leading to a remarkably improved sensitivity and selectivity. The interference from other heavy metal ions is studied in detail. Such sensing elements are very promising for practical environmental monitoring applications.