PREPARATION AND ION-EXCHANGE VOLTAMMETRIC CHARACTERIZATION OF COMPOSITE FILMS MADE OF CONDUCTING POLYMERS AND IONOMERS

摘要

Ion-exchange voltammetry is an electroanalytical technique,which employs solid electrodes modified by a thin film of an ion-exchange polymer [1].The polymeric coating allows the selective ion-exchange preconcentration and voltammetric determination of traces inorganic and organic electroactive ions of interest for environmental,biomedical or pharmaceutical analysis.This research is aimed to introduce electrochemical control in the uptake and release of the electroactive analytes.In principle,this can be achieved by preparing a composite between an ion-exchanger with fixed anion exchange functionalities and a conducting polymer [2,3],which,in the oxidized state,can act as polycationic counter ion.Electrochemical switching of the latter polymer from the reduced (insulating) to the oxidized (conducting) form should change the composite properties from those of a cation-exchanger to those of a neutral polymer.