Electrogeneration of Poly-N-Methylpyrrole Tosylate Doped Films: Electrochemical and Morphological Study

González-Tejera, M.J.; Martín, G. Hervás

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Portugaliae Electrochimica Acta

Print version ISSN 0872-1904

Port. Electrochim. Acta vol.25 no.3 Coimbra 2007

Electrogeneration of Poly-N-Methylpyrrole Tosylate Doped Films. Electrochemical and Morphological Study

M.J. González-Tejera* and G. Hervás Martín

Dpto. Química Física I. Fac. CC. Químicas. Universidad Complutense. 28040-Madrid, Spain

Received 27 September 2006; accepted 17 July 2007

Abstract

In order to investigate the electrochemical behaviour and morphology under different experimental conditions of poly-N-methylpyrrole doped with sodium p-toluensulphonate (NaTsO) in aqueous medium, the doped polymer was potentiostatically synthesized at four potential values: 0.6, 0.8, 0.9 and 1.0 V. The morphological study reveals a compact texture in these polymeric films; after being submitted to a positive potential those films were wrinkled. Cyclic voltammetry was used to characterize polymer films (pNMPy/TsO). The corresponding voltammograms revealed a reversible doping/de-doping process in those films obtained at η_p = 0.8 V. Different parameters such as: negative potential limit (E_i), positive potential limit (E_f), sweep rate (v) and continuous cycling were varied.

Keywords: conducting polymers, poly-N-methylpyrrole, tosylate anion.

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* Corresponding author. E-mail address: mjgonte@quim.ucm.es