Abstract
Some solid films of organic dyes, such as methylene blue, show a metallic luster. We are interested in the electrochromism of metallic luster and its reflected color from non-metallic materials. It has already been reported that 3-methoxythiophene polymers obtained by chemical and electrochemical synthesis show metallic luster. It was believed that this electrochemical polymerization could only produce a polymer product with high reflectance by slowly sweeping the applied potential, but a metallic luster was achieved by using a different electrolytic polymerization procedure. A constant potential is applied at which the monomer polymerizes, followed by a constant potential at which the polymer product obtained on the electrode is reduced. A polymer film that showed a green metallic luster in a reduced state and a red metallic luster in an oxidized state was obtained by repeating these potentiostatic electropolymerization procedures. We call this method as multi-step potentiostatic polymerization. These color tones were obtained when no light was transmitted through the polymer film, and we believe that they are caused by reflection on the surface of the polymer film. For reference, when white light was transmitted through the polymer film obtained, red color was observed in the reduced state and blue color was observed in the oxidized state. This is electrochromism based on transmitted color, which is well known as polythiophene electrochromism. By performing electrochromism with metallic luster, it becomes possible to apply it to switchable Mirror mirrors.
Published Version
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