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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

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Abstract

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 (C LF) and double-layer capacitance (C dl) 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.

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Acknowledgments

Financial support for this work by the Research Foundation of Namik Kemal University (Turkey) project number: NKU.BAP.00.10.AR.11.01 is gratefully acknowledged.

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  1. Department of Chemistry, Faculty of Arts and Sciences, Namik Kemal University, Degirmenalti Campus, 59030, Tekirdag, Turkey

    Murat Ates, Tolga Karazehir, Fatih Arican & Nuri Eren

  2. Department of Chemistry, Faculty of Arts and Sciences, Istanbul Technical University, Maslak, Istanbul, Turkey

    Tolga Karazehir

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  1. Murat Ates
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Ates, M., Karazehir, T., Arican, F. et al. 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. J Coat Technol Res 10, 317–330 (2013). https://doi.org/10.1007/s11998-012-9448-0

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