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Electrochemical preparation and characterization of a new conducting copolymer of 2,7-carbazole and 3-octylthiophene

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Abstract

In the present work, the synthesis and study of the electrochemical behavior of 2,7-bis(3-octylthiophene-2-yl)-N-methylcarbazole are reported. The electropolymerization of this monomer was achieved by potentiodynamic cyclic voltammetry and potentiostatic techniques. Voltammograms show that two different conducting deposits are formed on Pt for oxidation at 1.0 and 0.8 V. The nature of the deposits depends on the applied potential and the scan rate. Both deposits exhibit n- and p-doping/undoping processes that are thermodynamically reversible and kinetically partially reversible. The same behavior was determined on fluorine-doped tin oxide. The nucleation and growth mechanism (NGM) of the electropolymerization were investigated using a potentiostatic technique (i–t). Two mechanisms were obtained, and the deconvolution of the current–time transient for the low-potential data fitted with a theoretical model suggesting that at short times, an instantaneous nucleation with a two-dimensional growth contribution prevails, followed by a three-dimensional progressive nucleation with a transfer charge diffusion. Finally, at longer times, a three-dimensional progressive nucleation with a diffusion-controlled growth contribution becomes important. The morphology predicted from these NGMs fully correlates with that determined by scanning electron microscopy.

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Acknowledgments

The authors acknowledge the financial support from the FONDECYT Project No. 11080073 and the DII-Pontificia Universidad Católica de Valparaíso and are also grateful to CONICYT-FONDEQUIP program NMR 300 (Grant Number EQM 130154) and CONICYT-Beca Doctorado Nacional number 21120405.

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Authors and Affiliations

  1. Laboratorio de Polímeros, Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2950, Valparaiso, Chile

    Juliet Andrea Aristizabal, Juan Carlos Ahumada & Juan Pablo Soto

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  1. Juliet Andrea Aristizabal
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  2. Juan Carlos Ahumada
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  3. Juan Pablo Soto
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Correspondence to Juan Pablo Soto.

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Aristizabal, J.A., Ahumada, J.C. & Soto, J.P. Electrochemical preparation and characterization of a new conducting copolymer of 2,7-carbazole and 3-octylthiophene. Polym. Bull. 74, 1649–1660 (2017). https://doi.org/10.1007/s00289-016-1794-0

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  • DOI: https://doi.org/10.1007/s00289-016-1794-0

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