A thermodynamic approach to the interpretation of anodic and cathodic doping of poly(3-methylthiophene)

Csaba Visy, Jukka Lukkari, Jouko Kankare

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Anodically and cathodically conducting poly(3-methylthiophene) have been studied by transient and steady-state spectroelectrochemical methods in the presence of different anions (ClO-4, PF-6) and cations (BU4N+, Dec4N+) in acetonitrile solution of low water content. Spectral differences obtained with different ions are interpreted by assuming segments of different effective conjugation lengths in the neutral polymer determined by an interaction between the anions and the chains during the electrochemical preparation of the film. A redox mechanism based on thermodynamic considerations is suggested to describe the anodic and cathodic doping of thiophene-type conducting polymers. Both dopings start with the electrochemical transformation of species of longer effective conjugation length. Cyclic measurements are strongly controlled by non-equilibrium or quasi-reversible effects explained by the assumption of a two-phase system resulting in the undoping not being the simple inverse process of doping.

Original languageEnglish
Pages (from-to)85-100
Number of pages16
JournalJournal of Electroanalytical Chemistry
Volume319
Issue number1-2
DOIs
Publication statusPublished - Dec 10 1991

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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