Electrochromic properties of poly(o-methoxyaniline)-poly (3-thiophene acetic acid) layer by layer films

Solar Energy Materials and Solar Cells Volume: 157 Pages: 703-708 Published: 2016

20 de dezembro de 2016 CDMF Artigo 0

Cyclic-voltammograms-for — Cyclic voltammograms for (a) POMA casting film and (b) POMA/PTAALBL film and SEM micrographs (c) POMA casting and (d) POMA/PTAALBL films on ITO substrates. Measurements were made in 0.1 M LiClO4 in acetonitrile at 20 mVs1 at room temperature.

Writers: Wania Ap. Christinelli and Aline B. Trench and Ernesto C. Pereira

Keywords: Conducting polymers; Electrochromic devices; Layer-by-layer films; Self-doping

Abstract: In this work, a new material was developed to be used as the active electrode in an electrochromic device based on layer-by-layer poly(o-methoxyaniline) and poly(3-thiopheneacetic acid) films. Its properties were compared to a poly(o-methoxyaniline) film prepared by casting with similar electrochemical properties. The film preparation technique, layer-by-layer, guarantees molecular interaction between layers. In this case, the interaction leads to a self-doping effect, inhibiting the ion transport from the solution to the polymer which is the rate limiting step during the device operation. The results show both a decrease in the time constant for color change as well as a strong increase in the coloration efficiency, from 144.7 to 542 cm² C⁻¹ for POMA casting and LBL films, respectively.

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