| Abstract
| - Electroactive conducting copolymers of aniline and 4,4‘-diaminodiphenyl sulfone (DDS) were preparedelectrochemically. The cyclic voltammetric studies were carried out with different feed concentration ofDDS on a glassy carbon electrode surface. The voltammograms exhibited different behavior for differentconcentrations of DDS. The effect of scan rate and pH on the electroactive copolymer film was studied.The copolymer showed good adherence on the glassy carbon electrode surface and gave a response upto pH 7.0. Spectroelectrochemical analysis of copolymer film was carried out on an indium−tin oxideplate, and it showed multicolor electrochromic behavior when the applied potential was changed. Thecolor of the copolymer was changed from neutral yellow (427 nm) to green (777 nm) and to blue (600nm) at the concentration of 0.3 M aniline and 0.1 M DDS in 0.1 H2SO4 medium. When the DDSconcentration changed to 0.5 M, the spectra exhibited the color change from neutral yellow (417 nm) todark green (723 nm) and to dark blue (650 nm). The copolymer film was characterized by Fourier transformIR spectral data, and the surface morphology was studied using SEM analysis.
- The novel copolymer, poly(aniline-co-4,4‘-DDS) synthesized electrochemically exhibited good multicolor electrochromic behavior. Dependent upon the applied potential, the color of the polymer changed from yellow to green and then blue. This copolymer can be used in the development of dynamic electrochromic devices.
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