Redox processes in polyaniline thin films studied by optical multichannel analysis

Anne Hugot-Le Goff; Marie-Claude Bernard

doi:10.1117/12.130536

25 November 1992 Redox processes in polyaniline thin films studied by optical multichannel analysis

Anne Hugot-Le Goff, Marie-Claude Bernard

Proceedings Volume 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows; (1992) https://doi.org/10.1117/12.130536
Event: Optical Materials Technology for Energy Efficiency and Solar Energy, 1992, Toulouse-Labege, France

Abstract

Optical multichannel analysis (OMA) was used to follow the kinetics of color changes in electrochromic polyaniline (PANI) films when they are polarized in an electrolytic medium at different potentials; these color changes which are related to the transition from one polymer form to another one are very fast. For the setting of electrochromic devices, PANI must be used in acid electrolytic media. In these media, the color change mechanisms are essentially related to the chains protonation/deprotonation. The study is now extended to different pH media (neutral and alkaline) in order to obtain a better understanding of the chemical mechanisms of passage from one form to another one, and particularly of the oxidation of phenyl in quinone rings. OMA allowed us to also obtain an apparent value of the films absorption coefficient. In the investigated range (300/800 nm), several absorption phenomena characteristic of the different polymer forms can be displayed. The range in which two different forms coexist can then be characterized by the deconvolution of the optical spectra. Finally, the electrochromism in polymer is characterized by the change of optical density (Delta) DO directly obtained from the OMA experimental spectra.

Citation Download Citation

Anne Hugot-Le Goff and Marie-Claude Bernard "Redox processes in polyaniline thin films studied by optical multichannel analysis", Proc. SPIE 1728, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Chromogenics for Smart Windows, (25 November 1992); https://doi.org/10.1117/12.130536

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