Issue 6, 2007
From the journal:

New Journal of Chemistry

Identifying quinone-like species on the surface of graphitic carbon and multi-walled carbon nanotubes using reactions with 2,4-dinitrophenylhydrazine to provide a voltammetric fingerprint

Charles A. Thorogood,a   Gregory G. Wildgoose,a   John H. Jonesb  and  Richard G. Compton*a  

* Corresponding authors

a Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK
E-mail: richard.compton@chem.ox.ac.uk
Fax: +44 (0)1865 275410
Tel: +44 (0)1865 275413

b Chemical Research Laboratory, University of Oxford, Mansfield Road, Oxford, UK

Abstract

Quinone groups on the surface of edge-plane and basal-plane pyrolytic graphite electrodes, and, for the first time, “bamboo-like” multi-walled carbon nanotubes (b-MWCNTs), are labelled with a voltammetric “tag”, namely 2,4-dinitrophenylhydrazine (2,4-DNPH). The voltammetric response of these materials is studied in both aqueous and non-aqueous electrolyte solutions, and mechanisms are proposed for each media involving the voltammetrically controlled cleavage of the 2,4-DNPH adduct. Thus, these materials can be used for potentiometrically controlled chemical release, and as such may find application in, for example, drug delivery systems. In aqueous media, this cleavage results in the conversion of the surface quinonyl groups into surface arylnitroso species. This conversion is confirmed by studying the voltammetric response of the arylnitroso/arylhydroxylamine redox couple, formed after cleavage of the 2,4-DNPH adduct in the presence of L-glutathione, which has been shown in our previous work to react with arylnitroso species on the surface of graphitic carbon materials.

Graphical abstract: Identifying quinone-like species on the surface of graphitic carbon and multi-walled carbon nanotubes using reactions with 2,4-dinitrophenylhydrazine to provide a voltammetric fingerprint

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Article information

DOI
https://doi.org/10.1039/B700867H
Article type
Paper
Submitted
19 Jan 2007
Accepted
21 Mar 2007
First published
17 Apr 2007

New J. Chem., 2007,31, 958-965

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Identifying quinone-like species on the surface of graphitic carbon and multi-walled carbon nanotubes using reactions with 2,4-dinitrophenylhydrazine to provide a voltammetric fingerprint

C. A. Thorogood, G. G. Wildgoose, J. H. Jones and R. G. Compton, New J. Chem., 2007, 31, 958 DOI: 10.1039/B700867H

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