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The influence of graphene on the electrical communication through organic layers on graphite and gold electrodes

Zong,X, Kong,N, Liu,J, Yang,W, Cao,M and Gooding,JJ 2014, The influence of graphene on the electrical communication through organic layers on graphite and gold electrodes, Electroanalysis, vol. 26, no. 1, pp. 84-92, doi: 10.1002/elan.201300246.

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Title The influence of graphene on the electrical communication through organic layers on graphite and gold electrodes
Author(s) Zong,X
Kong,N
Liu,J
Yang,WORCID iD for Yang,W orcid.org/0000-0001-8815-1951
Cao,M
Gooding,JJ
Journal name Electroanalysis
Volume number 26
Issue number 1
Start page 84
End page 92
Publisher Wiley-VCH Verlag GmbH & Co. KGaA
Place of publication Weinheim, Germany
Publication date 2014
ISSN 1521-4109
1521-4109
Keyword(s) Electrical communication
Gold electrodes
Graphene
Graphite electrodes
Self-assembled monolayers (SAMs)
Summary The influence of graphene on the electrical communication through organic layers fabricated on graphite and gold electrodes is investigated. These layers were prepared by in situ reductive adsorption of 4-aminobenzoic acid in the presence of NaNO2 and HCl to have surface bound carboxylic acid functionalities, followed by covalent attachment of 1-aminopyrene via an amide coupling reaction to have surface bound pyrene groups for graphene immobilization via noncovalent π-π stacking interaction. The coverage of the layers created via reductive adsorption on graphite electrodes was found to be much higher than that on gold electrodes. It was revealed that graphene significantly enhances the electrical communication through the layers on graphite electrodes but on gold electrodes the enhancement effect through the layers was only minor. However, when gold electrodes were modified with a self-assembled monolayer (SAM) of propanethiol the subsequent immobilization of graphene resulted in a significant enhancement of the electrical communication. It is also found that immobilization of graphene could affect the electron transfer between the redox probe, pyrene and the underlying electrodes. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to characterize the graphene sheets. Cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS) were also used to characterize the stepwise modified electrodes. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Language eng
DOI 10.1002/elan.201300246
Field of Research 030306 Synthesis of Materials
030606 Structural Chemistry and Spectroscopy
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30072612

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