Comparison of electrolyte effects for poly(3,4-ethylenedioxythiophene) and poly(3-octylthiophene) by electrochemical impedance spectroscopy and polymerization parameters with morphological analyses on coated films

  • Murat Ates
  • Tolga Karazehir
  • Fatih Arican
  • Nuri Eren


3,4-Ethylenedioxythiophene and 3-octylthiophene were electropolymerized on glassy carbon electrodes (GCE) to compare with four different electrolytes [lithium perchlorate (LiClO4), sodium perchlorate, tetraethylammonium tetrafluoroborate, and tetrabutylammonium tetrafluoroborate] in a solvent of acetonitrile (CH3CN). Modified electrodes were characterized by cyclic voltammetry, attenuated total reflectance–Fourier transform IR spectroscopy, scanning electron microscopy, energy dispersive X-ray analysis, atomic force microscopy, and electrochemical impedance spectroscopy (EIS). Nyquist and Bode plots for magnitude, phase, admittance, and capacitance on both polymer-modified electrodes were comparatively investigated in detail. The highest low-frequency capacitance (CLF) and double-layer capacitance (Cdl) were obtained in 0.1 M LiClO4/CH3CN for poly(3,4-ethylenedioxythiophene) and poly(octylthiophene)/GCE. EIS data were fitted to the equivalent circuit model of R(Q(R(C(R(C(RW))))))(CR), which is used to investigate circuit parameters.


Poly(3,4-ethylenedioxythiophene) Poly(3-octylthiophene) Electrochemical impedance spectroscopy Electrolyte Morphology Atomic force microscopy 


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Copyright information

© American Coatings Association & Oil and Colour Chemists' Association 2012

Authors and Affiliations

  • Murat Ates
    • 1
  • Tolga Karazehir
    • 1
    • 2
  • Fatih Arican
    • 1
  • Nuri Eren
    • 1
  1. 1.Department of Chemistry, Faculty of Arts and SciencesNamik Kemal UniversityTekirdagTurkey
  2. 2.Department of Chemistry, Faculty of Arts and SciencesIstanbul Technical UniversityMaslakTurkey

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