QUARTZ-CRYSTAL MICROBALANCE CHARACTERIZATION OF ELECTROCHEMICAL DOPING OF POLYANILINE FILMS

The electrochemical ionic exchange of polyaniline film-coated electrod es was studied in detail by electrogravimetry using an electrochemical quartz crystal microbalance. The influence of film thickness, electro lyte composition and potential sweep rate is discussed. The data obtai ned from these measurements establish the dependence of ion population inside the film on the degree of oxidation from -0.25 to 0.5 V (versu s SCE). Analysis is made by calculating the relative contribution of a nions and cations to the polymer electroneutrality from the electroche mical quartz crystal microbalance and electric charge data.