Electrochemical properties of cation sensitive polypyrrole films

摘要: Abstract The influence of the electrochemical pretreatment (potentiodynamic cycling) and previous conditioning thick cation sensitive PPy films (30 μm) doped with sulphate, naphthalene-2-sulfonate (N-2-S) naphthalene-1,5-disulfonate (N-1,5-DS) on properties were studied. changes in chemical composition determined by electron probe microanalysis (EPMA). poor mobility dopant anions film participation cations redox process is basis their sensitivity. potentiodynamic cycling these correlated change several factors, such as activity potential interval potentiometric measurements, capacity, ionic content quality contact substrate. long-term electrode a certain solution necessary for achievement, maintenance or re-establishment stable quasi-equilibrium state characterized E r . untreated PPy|N-2-S PPy|N-1,5-DS electrodes proceeds very slowly. It accelerates after cycling, enabling use measurements only 2 days conditioning. big organic improves also response, extending considerably linear parts –log  plots towards low concentrations. nature this effect consists to become active region measurements.