Electrochemical Synthesis of Polypyrrole, Reduced Graphene Oxide, and Gold Nanoparticles Composite and Its Application to Hydrogen Peroxide Biosensor

Overview

Journal Nanomaterials (Basel)

Date 2017 Mar 25

PMID 28335348

Citations 10

Authors

Baoyan Wu

Na Zhao

Shihua Hou

Cong Zhang

Affiliations

Soon will be listed here.

Abstract

Here we report a facile eco-friendly one-step electrochemical approach for the fabrication of a polypyrrole (PPy), reduced graphene oxide (RGO), and gold nanoparticles (nanoAu) biocomposite on a glassy carbon electrode (GCE). The electrochemical behaviors of PPy-RGO-nanoAu and its application to electrochemical detection of hydrogen peroxide were investigated by cyclic voltammetry. Graphene oxide and pyrrole monomer were first mixed and casted on the surface of a cleaned GCE. After an electrochemical processing consisting of the electrooxidation of pyrrole monomer and simultaneous electroreduction of graphene oxide and auric ions (Au) in aqueous solution, a PPy-RGO-nanoAu biocomposite was synthesized on GCE. Each component of PPy-RGO-nanoAu is electroactive without non-electroactive substance. The obtained PPy-RGO-nanoAu/GCE exhibited high electrocatalytic activity toward hydrogen peroxide, which allows the detection of hydrogen peroxide at a negative potential of about -0.62 V vs. SCE. The amperometric responses of the biosensor displayed a sensitivity of 40 µA/mM, a linear range of 32 µM-2 mM, and a detection limit of 2.7 µM (signal-to-noise ratio = 3) with good stability and acceptable reproducibility and selectivity. The results clearly demonstrate the potential of the as-prepared PPy-RGO-nanoAu biocomposite for use as a highly electroactive matrix for an amperometric biosensor.

Citing Articles

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