Abstract
The effect of organic sulphonic acids on electrochemical, optical and conductivity properties of poly(aniline-co-o-anisidine-co-o-toluidine) terpolymer thin films have been investigated. Homo- and terpolymer thin films were synthesized electrochemically under cyclic voltammetric conditions in aqueous solutions of sulphuric acid, p-toluene sulphonic acid, sulphamic acid and sulphosalicylic acid at room temperature. The films were electro-polymerized in solution containing 0.1 M monomers and the respective electrolyte (1 M sulphuric acid or organic sulphonic acid) by applying a sequential linear potential scan rate of 50 mV/s between −0.2 and 1.0 V versus Ag/AgCl electrode. The electrosynthesized films were characterized by cyclic voltammetry, UV-Vis spectroscopy and conductivity measurement. It is observed that the UV-Vis peaks for sulphuric acid, p-toluene sulphonic acid, sulphamic acid and sulphosalicylic acid are appearing in the region of conducting emeraldine salt phase. In an overall study, the polymers prepared using these three organic sulphonic acids have higher conductivity than sulphuric acid; however, the higher conductivity is observed for p-toluene sulphonic acid as electrolyte in comparison with sulphamic acid and sulphosalicylic acid. Differential scanning calorimetry also proved the formation of terpolymer. A possible reaction mechanism for the homo- and co-polymer has been suggested.
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