Morphological and electrochemical properties of PPy, PAni bilayer films and enhanced stability of their electrochromic devices (PPy/PAni–PEDOT, PAni/PPy–PEDOT)

Polyaniline (PAni), polypyrrole (PPy) and their bilayer coatings on ITO coated glass were prepared by electropolymerization method. Morphological and spectroelectrochemical properties of these films depending on the thickness and the sequence of the coated polymers (PAni/PPy or PPy/PAni) were analyzed. Cyclic voltammetry, UV–vis spectroscopy and scanning electron microscopy techniques were conducted to investigate the properties of bilayer...