Electrochemical characterization of polythiophene derivatives modified electrodes using differential pulse techniques

The electrochemical behavior of poly[4,4′-bis(butylsulfanyl)-2,2′-bithiophene] (PBSBT) modified conventional-size and microelectrodes in acetonitrile and aqueous solutions has been investigated using differential pulse voltammetry and cyclic voltammetry. The differential pulse voltammograms of both conventional-size and microelectrodes modified with PBSBT in acetonitrile containing 0.1 M TBAPF6 show the appearance of two peaks, when the electrode potential is scanned from 0.0 to +1.0 V, which correspond to the polaron formation (peak at ca. +0.50 V), and to bipolaron formation (peak at ca. +0.90 V), respectively. This behavior of the polymer when submitted to differential pulse measurements is similar to that exhibited in cyclic voltammetric tests. The modified electrodes present good stability under repetitive scanning of the electrode potential.