The brush model of the polymer films - Analysis of the impedance spectra of Au,Pt̄poly(o-phenylenediamine) electrodes

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25 Citations (Scopus)

Abstract

In the "brush model" of polymer modified electrodes it is assumed that the polymer film consists of short and long polymer chains forming bundles in such a way that only a small part of the metal substrate surface is covered by the polymeric material. The results of electrochemical impedance spectroscopy, cyclic voltammetry and surface stress measurements confirm that a brush-like ordering of the polymer chains on the metal surface is a realistic description of the surface film structure. Physicochemical parameters obtained from electrochemical impedance spectra for poly(o-phenylenediamine) films on platinum in contact with 1 M HClO4 or 0.5 M H2SO 4 solution were analyzed on the basis of the brush model. The characteristic parameters derived from the impedance spectra of different electrodes were compared.

Original languageEnglish
Pages (from-to)1680-1694
Number of pages15
JournalElectrochimica Acta
Volume51
Issue number8-9
DOIs
Publication statusPublished - Jan 20 2006
EventElectrochemical Impedance Spectroscopy Selection of Papers from the 6th International Symposium (EIS 2004) -
Duration: May 16 2004May 21 2004

Keywords

  • Brush model
  • Electrochemical impedance spectroscopy
  • Gold
  • Platinum
  • Poly(o-phenylenediamine)

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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