Electrochemucalinvestigation Of The Leucoemeraldineiemeraldine Redox Couple Of Polyaniline

Polyaniline (PANI) was prepared electrochemically by the pulse and potentialrncycling methods at gold and platinum electrodes, respectively. Thin and thick films werernprepared by the latter method. Square-wave and ac-voltammetric methods were employed torninvestigate the leucoemeraldine/emeraldine redox couple. Two well-separated cunent peaksrnwere obse!ved in the thick films suggesting a two-step reaction in the oxidation process. Therneffect of supporting electrolytes on the ac-voltammetric behavior of PANI was alsorninvestigated. The positions of the current peaks seem to be influenced by the size of thernanion. The obselved two-current peaks might be due to a two-step reaction in therntransformation of leucoemeraldine to emeraldine.

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