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




A Novel Nonenzymatic Hydrogen Peroxide Sensor Based on a Polypyrrole Nanowire-Copper Nanocomposite Modified Gold Electrode - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

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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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. View Full-Text

Keywords: Polypyrrole nanowires; Copper nanoparticles; Nonenzymatic sensor; Hydrogen peroxide Polypyrrole nanowires; Copper nanoparticles; Nonenzymatic sensor; Hydrogen peroxide





Autor: Tingting Zhang, Ruo Yuan * , Yaqin. Chai, Wenjuan Li and Shujuan Ling

Fuente: http://mdpi.com/



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