Département de chimie moléculaire

The spectroelectrochem. behavior of cast poly(3-octylthiophene) (POT) films (0.2 and 0.5 $μ$m) on ITO glass electrodes was investigated in org. media. These thin films exhibit interesting electrochromic properties and their application in electrochromic devices was examd. in liq. (CH3CN + 0.3M LiClO4) and viscous (PEO + CH3CN + 0.3M LiClO4) electrolyte. Polyaniline (PANI) film appears to be a convenient complementary counter-electrode since its transmission max. corresponds to its oxidized state and that of POT film in its reduced state. Thin films of IrO2 are also suitable counter-electrodes, even in acetonitrile; the electrochem. behavior being mostly capacitive with a low transmission change. However, the best contrast is obtained with the POT/PANI system. [on SciFinder(R)]