ELECTROCHEMICAL-BEHAVIOR OF POLYPYRROLE FILM POLYMERIZED IN INDIGO CARMINE SOLUTION

Z GAO, Johan Bobacka, Andrzej Lewenstam, Ari Ivaska

Research output: Contribution to journalArticleScientificpeer-review

50 Citations (Scopus)

Abstract

Electrochemical studies have been conducted to characterize polypyrrole film prepared in indigo carmine solution, PPy(IC). The PPy(IC) film was found to be formed via an adsorbed layer of IC on the substrate electrode surface. No obvious nucleation process was observed during the film deposition. The electrochemical processes of PPy(IC) are mediated by the entrapped IC in the film. It was found that the redox potential of the PPy(IC) film is dependent on the pH of the solution in the pH range of 0-9, and a stable cyclic voltammogram was obtained at pH values lower than 7. In an alkaline medium, however, the film loses its redox response quickly upon potential cycling resulting in a cation permselective membrane. The PPy(IC) membrane with the bulky and multi-charged dopant was found to have cationic sensitivity but the film was nevertheless rather non-selective to cations.
Original languageUndefined/Unknown
Pages (from-to)755–762
Number of pages8
JournalElectrochimica Acta
Volume39
Issue number5
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

Keywords

  • INDIGO CARMINE
  • VOLTAMMETRY
  • POLYMERIZATION

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