Voltammetric and electrochemical impedance analysis of poly(bisphenol A) supported poly(3,4-ethylenedioxythiophene) layers deposited on gold – the effects of thickness distribution, overoxidation and non-stationarity

The present study describes the preparation and electrochemical characterization of poly(bisphenol A) (poly(BPA)) supported poly(3,4-ethylenedioxythiophene) (PEDOT) modified gold electrodes. Cyclic voltammetry (CV) impedance spectroscopy (EIS) were used to characterize electrochemistry Au | PEDOT 0.1 mol/dm3 H2SO4(aq.) [poly(BPA)/PEDOT] electrodes before after overoxidation. Scanning electron microscopy (SEM) was for structure/morphology polymer coatings. Similarly overoxidized electrodes, time evolution properties poly(BPA)/PEDOT films could be observed four-dimensional (4D) analysis method (i.e., a post-experimental mathematical/analytical procedure overcome problems caused by non-stationarity) complex nonlinear least-squares (CNLS) fitting has been estimation parameters corresponding different instants overoxidation film. deviations responses from purely capacitive behavior predicted at low frequencies theoretical models well explained solely assumption uneven film thickness. It found that model, which takes into account thickness distribution gives good description data, both According results, deposition poly(BPA) on layer resulting electrode becomes more resistant against negative effects