EQCM and in situ conductance studies on the polymerization and redox features of thiophene co-polymers

Csaba Visy, Jouko Kankare, Emese Kriván

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

3-Thiophene-acetic acid and 3-methylthiophene co-polymers have been prepared with the consideration that the solvation behaviour of the film could be modified. The modification is coupled with the observed splitting of the oxidation peak on the cyclic voltammograms. The redox transformation of the films was studied by electrochemical quartz crystal microbalance (EQCM) and in situ conductance (ISC) techniques. Mass changes during the electrochemical processes showed that the cation is not involved into the charge balancing of the film. Manifestation of self-doping was excluded by analogous measurements with an aprotic co-polymer of methylthiophene. Results completed with in situ conductance and spectroelectrochemical observations confirmed the assumption of a chemical step taking place after the first oxidation. In this process desolvation of the oxidized intermediate occurs, which is a necessary step for the achievement of the quasi-metallic state.

Original languageEnglish
Pages (from-to)3851-3864
Number of pages14
JournalElectrochimica Acta
Volume45
Issue number22
DOIs
Publication statusPublished - Jul 28 2000

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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