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

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.

Preparation and characterisation of poly(3,4-ethylenedioxythiophene) and poly(3,4-ethylenedioxythiophene)/poly(neutral red) modified carbon film electrodes, and application as sensors for hydrogen peroxide

“…In another study [36] with the polymer 5,2´:5´,2"-terthiophene-3´-carboxylic acid polymer (TCAP)), also with HRP, hydrogen peroxide reduction was measured at -0.2 V vs. Ag/AgCl and the response was more sensitive (0.48 μA cm -2 mmol -1 dm 3 ), with a wider linear range (up to 1.5 mmol dm -3 ) but the detection limit of 0.2 mmol dm -3 ) was higher than in the present work. There are very few reports in the literature concerning the determination of hydrogen peroxide without enzyme amplification at electrodes modified with conducting polymers [37] or composites containing polymer [38];…”

One Dimensional Silver‐based Nanomaterials: Preparations and Electrochemical Applications

“…Alloy NWs were used in electrochemical sensors for the detection of compounds. Benefiting from the high surface area of 1D nanoarchitecture, the Alloy NWs provided much effective surface exposure at the electrode‐electrolyte interface …”

Graphene oxide-Cu(II) composite electrode for non-enzymatic determination of hydrogen peroxide

“…Therefore, the determination of H 2 O 2 concentration is of great importance in both biological and environmental systems. The various analytical methods have been developed for the determination of hydrogen peroxide including titrimetry, spectrophotometry, fluorimetry, fluorescence, chromatography, chemiluminescence and electrochemical methods [5,6]. Among all the above methods, electrochemical methods offer a simple, sensitive, rapid and economically favourable method for the detection of H 2 O 2 [7].…”