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Sensors 2008, 8(8), 5141-5152; doi:10.3390/s8085141

A Novel Nonenzymatic Hydrogen Peroxide Sensor Based on a Polypyrrole Nanowire-Copper Nanocomposite Modified Gold Electrode

Chongqing Key Laboratory of Analytical Chemistry, College of Chemistry and Chemical Engineering, Southwest University, key Laboratory on Luminescence and Real-Time Analysis Southwest University, Ministry of Education, Chongqing 400715, P.R. China
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Received: 10 July 2008 / Revised: 19 August 2008 / Accepted: 20 August 2008 / Published: 28 August 2008
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Abstract

A novel nonenzymatic hydrogen peroxide (H2O2) sensor has been fabricated by dispersing copper nanoparticles onto polypyrrole (PPy) nanowires by cyclic voltammetry (CV) to form PPy-copper nanocomposites on gold electrodes. Scanning electron microscopy (SEM) was used to characterize the morphologies of the PPy nanowires and the PPy-copper nanocomposite. The reactivity of the PPy-copper nanocomposite towards H2O2 was characterized by cyclic voltammetry and chronoamperometry. Effects of applied potential, the concentrations of detection solution upon the response currents of the sensor were investigated for an optimum analytical performance. It was proved that the PPy-copper nanocomposite showed excellent catalytic activity for the reduction of hydrogen peroxide (H2O2). The sensor showed a linear response to hydrogen peroxide in the concentration range between 7.0×10-6 and 4.3×10-3 mol L-1 with a high sensitivity, and a detection limit of 2.3×10-6 mol L-1. Experiment results also showed that the sensor had good stability.
Keywords: Polypyrrole nanowires; Copper nanoparticles; Nonenzymatic sensor; Hydrogen peroxide Polypyrrole nanowires; Copper nanoparticles; Nonenzymatic sensor; Hydrogen peroxide
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Zhang, T.; Yuan, R.; Chai, Y.; Li, W.; Ling, S. A Novel Nonenzymatic Hydrogen Peroxide Sensor Based on a Polypyrrole Nanowire-Copper Nanocomposite Modified Gold Electrode. Sensors 2008, 8, 5141-5152.

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