Studies of the formation and redox transformation of poly(o-phenylenediamine) films using a quartz crystal microbalance

K. Martinusz, E. Czirók, G. Inzelt

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The electropolymerization of o-phenylenediamine on gold and the redox behaviour of poly(o-phenylenediamine) films were studied in acid media using the electrochemical quartz crystal microbalance technique. It was established that the film formation is not an autocatalytic process and takes place mainly during the negative-going potential scan. The results indicate that the films are swollen by solvent molecules and ions in both reduced and oxidized states, and the extent of swelling increases with film thickness. At least two electron transfer steps should be considered in the redox mechanism. In the first oxidation step anion insertion and/or proton expulsion occur, while in the second oxidation step anions and/or protons are expelled. The magnitude of the mass changes accompanying the redox transformations depends on the pH of the bulk solution, which indicates that protonation-deprotonation processes play an important role in the overall mechanism. Dimerization of sites of different oxidation states may also occur. A counter-flux of water molecules can be assumed during the second oxidation step, i.e. the fully oxidized films are more hydrated.

Original languageEnglish
Pages (from-to)437-444
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume379
Issue number1-2
DOIs
Publication statusPublished - Dec 12 1994

Fingerprint

Quartz crystal microbalances
Oxidation
Anions
Protons
Negative ions
Deprotonation
Molecules
Electropolymerization
Dimerization
Protonation
Gold
Swelling
Film thickness
Ions
Fluxes
Acids
poly(o-phenylenediamine)
Oxidation-Reduction
Electrons
Water

Keywords

  • Electropolymerization
  • poly(o-phenylenediamine) films
  • quartz crystal microbalance
  • redox transformation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Studies of the formation and redox transformation of poly(o-phenylenediamine) films using a quartz crystal microbalance. / Martinusz, K.; Czirók, E.; Inzelt, G.

In: Journal of Electroanalytical Chemistry, Vol. 379, No. 1-2, 12.12.1994, p. 437-444.

Research output: Contribution to journalArticle

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