Jump to main content
Jump to site search

Issue 5, 2014
Previous Article Next Article

In situ oxygenous functionalization of a graphite electrode for enhanced affinity towards charged species and a reduced graphene oxide mediator

Author affiliations

Abstract

The weak affinity of bare carbon based electrodes for biological molecules or charged species is a major drawback for their direct application in analytical electrochemistry. We observed that the surfaces of graphite rods and glassy carbon (GC) ring electrodes can be modified by oxygenated functional groups through controlled electrochemical oxidation in aqueous media. Study of their cyclic voltammetry, surface conductivity, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, infrared spectroscopy (IR) and powder X-ray diffraction (PXRD) spectroscopy confirmed the chemical change. In the electrodynamics study, the modified GC ring in a rotating ring-disk electrode (RRDE) assembly showed better electron transfer efficiency than the virgin electrode when evaluated using a Ru(bpy)32+/3+ couple. In comparison to the virgin electrode, the modified graphite rod exhibited better affinity toward polyvinylpyrrolidone protected reduced graphene oxide (PVP-rGO) attached to glucose oxidase enzymes (GOx), and showed the direct attachment of mediators to the oxygenated electrode surface. These observations imply that a small oxygenated layer on the carbon electrode surface can significantly increase its activity. The present evidence indicates the possibility for the oxygenous functionalization of carbon based electrodes for applications in areas like electrokinetics studies and biosensing, where strong analyte–electrode interactions are useful.

Graphical abstract: In situ oxygenous functionalization of a graphite electrode for enhanced affinity towards charged species and a reduced graphene oxide mediator

Back to tab navigation

Supplementary files

Publication details

The article was received on 24 Nov 2013, accepted on 21 Jan 2014 and first published on 21 Jan 2014


Article type: Paper
DOI: 10.1039/C3NJ01471A
Author version available: Download Author version (PDF)
Citation: New J. Chem., 2014,38, 2120-2127
  •   Request permissions

    In situ oxygenous functionalization of a graphite electrode for enhanced affinity towards charged species and a reduced graphene oxide mediator

    M. R. Karim, Y. Ikeda, T. Ide, S. Sugimoto, K. Toda, Y. Kitamura, T. Ihara, T. Matsui, T. Taniguchi, M. Koinuma, Y. Matsumoto and S. Hayami, New J. Chem., 2014, 38, 2120
    DOI: 10.1039/C3NJ01471A

Search articles by author

Spotlight

Advertisements