Coating of gold substrates with polyaniline through electrografting of aryl diazonium salts

The results of an experimental study on electrochemical preparation of polyaniline (PANI)/polycrystalline gold composites are reported in this work. A three steps approach is adopted in order to obtain a stable and uniform coating: (1) functionalization of the gold surface by 4-nitrophenyl group, (2...

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Bibliographic Details
Published in:Electrochimica acta 2014-04, Vol.126, p.81-89
Main Authors: Vacca, A., Mascia, M., Rizzardini, S., Palmas, S., Mais, L.
Format: Article
Language:English
Subjects:
Amines
Aminophenyl modified electrode
Aromatic compounds
Coating
Electrochemical impedance spectroscopy
Electrodes
Gold
Nitrobenzendiazonium
Polyaniline
Polyanilines
Voltammetry
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Summary:The results of an experimental study on electrochemical preparation of polyaniline (PANI)/polycrystalline gold composites are reported in this work. A three steps approach is adopted in order to obtain a stable and uniform coating: (1) functionalization of the gold surface by 4-nitrophenyl group, (2) electrochemical reduction of the nitro group to amine, and (3) electropolymerization of aniline onto the surface of the aminophenyl-modified gold electrode. Cyclic voltammetries and electrochemical impedance spectroscopies are used to characterize the gold surface after each step. Also the results of a sample prepared by electropolymerization of PANI on bare gold are presented as a comparison.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.08.187