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Issue 8, 1993
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Preparation and characterization of tungsten trioxide/dibenzyl viologen polymer bilayer electrochromic films

Abstract

A new composite electrochromic material has been prepared by electropolymerizing N,N′-bis[p-(trimethoxysilyl)benzyl]-4,4′-bipyridinium dichloride (BPQ2+·2Cl) on top of a reductively conducting film of tungsten trioxide. The resulting bilayer system responds to a potential step from 0.9 to –0.65 V by turning from colourless to blue in two steps: the absorbance due to one-electron reduction of each monomer unit in poly(BPQ2+) increases quickly (in < 4 s), and is followed by a slower development of the absorbance due to the WO3 reduction ( > 1 min). The significance of these bilayer films is discussed with respect to applications to electrochromic devices.

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Article type: Paper
DOI: 10.1039/JM9930300833
Citation: J. Mater. Chem., 1993,3, 833-839
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    Preparation and characterization of tungsten trioxide/dibenzyl viologen polymer bilayer electrochromic films

    N. Leventis and Y. C. Chung, J. Mater. Chem., 1993, 3, 833
    DOI: 10.1039/JM9930300833

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