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Electrochemical restructuring o polyaniline films in the presence of catechols
|Grzegorz Milczarek , Aleksander Ciszewski|
Poznań Technical University, Institute of Chemistry and Applied Electrochemistry, Piotrowo 3, Poznań 60-965, Poland
It is shown that electrochemical cycling of polyaniline modified electrodes in acidic electrolytes containing dissolved catechol(s) results in covalent attachement of this species to polyaniline. Electrochemical properties of polyaniline are significantly altered and a new voltammetric peaks appear that are not assigned to parent polyaniline nor catechol (Fig 1).
Fig. 1. Cyclic voltammogram of catechol-restructured polyaniline film in 0.1M H2SO4
The proposed mechanism involves nucleophilic addition of polyaniline to oxidized form of catechol (o-quinone). When sulfonated catechol is generated by the oxidation of guaiacol sulfonic acid on polyaniline film it also attaches to the polymer to form a new self-doped composite retaining its electrochemical activity in neutral electrolytes. Morover it exhibits persistent electrochemical activity toward the oxidation of ascorbic acid.
Presentation: Poster at SMCBS'2005 Workshop, by Grzegorz Milczarek
See On-line Journal of SMCBS'2005 Workshop
Submitted: 2005-07-13 20:03 Revised: 2009-06-07 00:44