Electrochemical relaxation study of polythiophene as a conducting polymer (II)

The electrosynthesis of polythiophene films from thiophene, 2,2′,5,2″-terthiophene, 3-methylthiophene and 3-bromothiophene monomers was investigated using different electrochemical techniques. The stability and electrical conductivity of the prepared films were studied. The most stable polythiophene film was obtained using galvanostatic technique in acetonitrile solvent and TBAPF6 as a supporting electrolyte at 5 °C, except in the case of electropolymerization of 3-bromothiophene the most stable film was obtained potentiodynamically. The relaxation kinetics of the films was extensively studied. It was found that a very thin film would hardly shows the slow relaxation. Also by using TBAPF6 as an electrolyte, the most sensitive film was obtained, which has the lowest relaxation. The relaxation time is sharply affected by increasing the donor number of the solvent used and also by temperature.