Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Investigation of the optimal weight contents of reduced graphene oxide–gold nanoparticles composites and theirs application in electrochemical biosensors

Language

English

Abstract

Graphene, as a single-atom-thick carbon material, is considered an ideal platform for designing composite nanomaterials for high-performance electrochemical or electrocatalytic devices. Reduced graphene oxide-gold nanoparticles composites were prepared by depositing gold nanoparticles (AuNPs) on the surface of reduced graphene oxide (RGO) with different RGO-to-AuNPs weight ratios. The resulting composite materials were characterized morphologically and optically by scanning electron microscopy (SEM) and UV-visible absorption spectroscopy. Cyclic voltammetry and amperometric measurements were employed to investigate the electrocatalytic effect of different composites toward the reduction of hydrogen peroxide. Experimental results demonstrated that RGO-AuNPs composites displayed high stability and catalytic effect for the analysis of hydrogen peroxide, demonstrating the possible synergistic effects of the RGO-AuNPs composite materials. Additionally, direct electron transfer of glucose oxidase (GOD) was achieved after codeposition of GOD and chitosan (CHIT). The glassy carbon electrode modified with RGO-AuNPs/CHIT-GOD material exhibited an excellent catalytic effect for glucose detection with a sensitivity of 34 mA M-1 cm-2 at a detection potential of -0.3 V vs. Ag|AgCl reference. © 2014 Elsevier B.V. All rights reserved.

Keywords

Au nanoparticles, Composite materials, Electrochemical biosensor, Reduced graphene oxide, Weight ratio

Publication Date

2014

Source Publication Title

Journal of Electroanalytical Chemistry

Volume

720-721

Start Page

84

End Page

91

Publisher

Elsevier

DOI

10.1016/j.jelechem.2014.03.031

ISSN (print)

15726657

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