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Counter-ion and pH effect on the electrochemical synthesis of polyaniline

The effect of different electrolytes at various pH values on the electropolymerization of aniline from aqueous solutions has been studied. It has been found that polyaniline can be synthesized within the whole pH range investigated, provided that the proper counter-ion is present. Distinct regions of different pH effect on aniline polymerization have been identified and corresponding reaction mechanisms suggested. It was also found that polyaniline synthesized in the solutions having high pH values, when transferred to acidic solutions, switched from a non- conductive to a conductive state, giving voltammograms and FTIR spectra characteristic of PANI synthesized in acidic media.

polyaniline ; counter-ion effect ; cyclic voltammetry ; pH effect

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