Electrochemical and Electrochromic Properties of Polymer Complex Films Composed of Polytetramethyleneviologen and Poly-[p-Styrenesulfonic Acid] Containing a Conductive Powder |
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| Authors: | Kenji Nomura Kazuko Hirayama Takeo Ohsaka Masahiro Nakanishi Osamu Hatozaki Noboru Oyama |
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| Institution: | 1. Materials &2. Electronic Devices Laboratory , Mitsubishi Electric Corp. , Amagasaki, Hyogo, 661, Japan;3. Department of Applied Chemistry for Resources , Tokyo University of Agriculture &4. Technology , Koganei, Tokyo, 184, Japan |
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| Abstract: | The electrochemical and electrochromic properties of polymer films containing a conductive powder (SnO2/TiO2) have been investigated. The films are complexes of polytetramethyleneviologen and poly(p-styrenesulfonic acid). It was found that the coloration (purple) and bleaching rates of the composite films increase markedly with increasing conductive powder content(x). The coloring and bleaching of the composite film with x = 95 wt% were about 7 and 44 times faster, respectively, than those for an equivalent film without conductive powder. This increase in the rate of color change by introduction of a conductive powder was found to be correlated with the apparent diffusion coefficient (D app) for the diffusionlike charge-transport process within the composite films which increases with increasing x. The D app for the reduction process of the film with x = 95 wt% was larger by about 3 orders of magnitude than that for the unfilled film. |
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