Pyrrole copolymer produced by coelectropolymerization of pyrrole (Py) and 2,2′-dithiodianiline (DTDA) in organic medium (propylene carbonate, PC) was investigated by cyclic voltammetry, UV-visible spectroelectrochemical study, infrared spectroscopy, and scanning electron spectroscopy (SEM). The cyclic voltammogram of the copolymer grown from nonaqueous media containing an electrolyte (LiClO4) is significantly affected by DTDA concentration in the deposition solution. The electropolymerization rate of pyrrole is decreased upon addition of DTDA in the growth solution. This involves the possible branched structure for the copolymer. SEM was used to determine the morphological behavior of the copolymer. The results show that a branch as a consequence of incorporation of DTDA units resulting in -S-S- links in the polypyrrole structure. UV-visible spectrum of the copolymer showed three optical transitions at ηmax = 390, 540, and 800 nm for different applied potentials. At 425 nm, a fixed stoichiometric ratio of oxidized to reduced form exists when the P(Py-DTDA) copolymer film is oxidized successively by applying potentials, but such a ratio did not exist in PPy film.
All Science Journal Classification (ASJC) codes