Journal
SENSORS
Volume 8, Issue 8, Pages 5141-5152Publisher
MDPI
DOI: 10.3390/s8085141
Keywords
polypyrrole nanowires; copper nanoparticles; nonenzymatic sensor; hydrogen peroxide
Funding
- National Natural Science Foundation of China [20675064]
- Natural Science Foundation of Chongqing City [CSTC-2004BB4149, 2005BB4100]
- High Technology Project Foundation of Southwest University [XSGX 02]
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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 x 10(-6) and 4.3 x 10(-3) mol L-1 with a high sensitivity, and a detection limit of 2.3 x 10(-6) mol L-1. Experiment results also showed that the sensor had good stability.
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