Abstract
Two donor-acceptor electrochromic copolymers containing fused rigid units of cyclopentadithiophene and diketopyrrolopyrrole, namely PCPDTT-DPP with benzene and thiophene ring linkers, were successfully synthesized. The electrochromic properties of the copolymers were characterized by cyclic voltammetry, UV-Vis spectroscopy and spectroelectrochemical method. The results demonstrated that the effect of DPP on the copolymer showed the p-type doping with an electrochemical band gap of 1.45 eV. The copolymer showed a higher color contrast changing from purple to transparent with %ΔT of 55% at ±1.0 V vs. Ag/AgCl compared to the parent polymer containing only cyclopentadithiophene unit. The results indicated that the new copolymer could be a potential candidate for electrochromic materials in smart films and windows.
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Acknowledgements
This work was supported by the National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Thailand. The authors would like to thank Prof. Thawatchai Tuntulani and Prof. Supapan Seraphin for fruitful discussions.
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Jiramitmongkon, K., Chotsuwan, C., Asawapirom, U. et al. Cyclopentadithiophene and Diketo-pyrrolo-pyrrole fused rigid copolymer for high optical contrast electrochromic polymer. J Polym Res 27, 17 (2020). https://doi.org/10.1007/s10965-019-1989-9
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DOI: https://doi.org/10.1007/s10965-019-1989-9