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Electrochemical synthesis and characterization of thiophene conducting polymer in aqueous micellar medium

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Abstract

In opposite with the usually applied synthesis in organic media, the polymerization of bithiophene in aqueous media has been studied. The use of a non-ionic surfactant (polyoxyethylene octyl phenyl ether (Triton X-100)) is useful not only to solubilize the hydrophobic monomer but it is also important to incorporate various—biologically and catalytically active—additives. In this paper, the optimization of the polymerization conditions as well as the characterization of the electrochemical, spectral and mass exchange behavior of these composite films is summarized. The layers have shown imperceptible electroactivity in monomer-free aqueous LiClO4 solutions, and electrochemical quartz crystal microbalance (EQCM) studies exhibited scarce ion movements, caused assumingly by the fact that the dopant species—moving together with their hydrate shell in the aqueous media—could not penetrate into the hydrophobic film. In contrast, nice reversible redox transformation could be obtained in organic medium such as acetonitrile, where—according to the EQCM results—the charge carrier formation/depletion is accompanied by the incorporation/removal of ClO4 − anions. In this solution, the spectral changes have proved the transformation into the conducting state, connected to both mono- and di-cation forms. The incorporation of the surfactant has been demonstrated by the extraordinary surface morphology of the polybithiophene (pBT) films, characterized by scanning electron microscopy. The elementary composition of the curious shell-shaped objects, monitored by energy dispersive X-ray spectroscopy (EDX), evidenced the presence of Triton X-100 by the increased C/S ratio compared to neat polybithiophene, while the Cl/S data reflected the changes connected to the doping level as a consequence of ClO4 − anion movements. Moreover, ex situ attenuated total reflectance (ATR) FT–IR measurements clearly showed the existence of C―O bonds, also proving the successful functionalization by the surfactant, built permanently into the redox active films.

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Acknowledgment

This work was supported by TÉT/PHC–Balaton Hungarian/French bilateral programme no.:10-1-2011-0713.

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Authors and Affiliations

  1. Department of Physical Chemistry & Materials Science, University of Szeged, Aradi vt. sq. 1, Szeged, H6720, Hungary

    Péter S Tóth & Csaba Visy

  2. Université Paris Diderot, Sorbonne Paris Cité, Laboratoire ITODYS, UMR 7086, 15 rue Jean Antoine de Baif, 75205, Paris Cedex 13, France

    Christian Perruchot, Amani Chams, Nabiha Maslah & Mohamed Jouini

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  1. Péter S Tóth
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  2. Christian Perruchot
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  3. Amani Chams
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Correspondence to Csaba Visy.

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Péter S Tóth, Christian Perruchot, Mohamed Jouini, and Csaba Visy are ISE members.

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Tóth, P.S., Perruchot, C., Chams, A. et al. Electrochemical synthesis and characterization of thiophene conducting polymer in aqueous micellar medium. J Solid State Electrochem 17, 635–641 (2013). https://doi.org/10.1007/s10008-012-1899-9

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