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International Journal of Electrochemistry
Volume 2012, Article ID 410846, 8 pages
http://dx.doi.org/10.1155/2012/410846
Research Article

Improvement of Amperometric Biosensor Performance for H2O2 Detection based on Bimetallic PtM (M = Ru, Au, and Ir) Nanoparticles

1Department of Chemistry, Shanghai University, Shanghai 200444, China
2Department of Chemical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
3Institute of Materials Science and Engineering, National Central University, Chung-Li 320, Taiwan
4Department of Material Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA

Received 13 September 2011; Revised 26 October 2011; Accepted 28 October 2011

Academic Editor: Ulku Anik

Copyright © 2012 Yuan Zhang 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

Novel bimetallic nanoparticles have been synthesized via rapid microwave irradiation, leading to an improved sensitivity and a highly anti-interference property for amperometric biosensor in H2O2 detection. The material characterizations were performed by TEM, XRD, and EDX, which show the bimetallic formation of Pt-based catalysts and well-dispersed nanoparticles of 2–5 nm. The sensitivities for the detection of H2O2 of PtRu, PtAu, and PtIr as the biosensor working electrode catalysts are 539.01 ( ), 415.46 ( ), and 404.52 ( ) μA·mM−1·cm−2, respectively, nearly twice higher than the pure Pt catalyst (221.77 μA·mM−1·cm−2, ), at a low applied potential of +0.25 V versus Ag/AgCl. Furthermore, Pt-Ru and Pt-Ir show a highly sensitive response and a promising anti-interference capability to ascorbic acid, a major interferent, by reducing the interferent current as low as 7-8% significantly lower than that of Pt (30% change). The enhancement of both sensitivity and selectivity in the bimetallic catalysts can be found practical applications in biosensing.