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1 Polish Journal of Chemistry

1 2004

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Studies on Spontaneous Discharge of Oxidized Polypyrrole and Poly(N-methylpyrrole)

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Dumańska J. , Maksymiuk K.

Polish Journal of Chemistry

2004

tom Vol. 78 / nr 9

1477-1491

Spontaneous processes of charging/discharging of conducting polymers affect analytical characteristics of potentiometric sensors using conducting polymer films as ion sensitive membranes (detection limit, selectivity, sensitivity to redox interferences). These effects also contribute to undesirable loss of charge accumulated in the polymer phase used in charge storing devices. For polypyrrole and its derivatives the charging process is mainly related to oxidation by oxygen or other oxidants present in solution. On the other hand, the nature of the discharge process of oxidized polymer is still not quite clear. This work is oriented towards revealing the nature of the discharge reaction of polypyrrole and poly(N-methylpyrrole). The significance of spontaneous processes, especially for analytical characteristic of potentiometric sensors based on conducting polymers, is highlighted. Therefore, the effect of electrolyte concentration, solution acidity, influence of oxygen, conditioning time and medium was studied. The results of potentiometric and coulometric studies support the thesis that the discharge process is related to the polymer deprotonation; its rate is affected by pre-polarization of the electrode and conditioning of the polymer film.