Preparation and Characterization of Tungsten Trioxide/dibenzyl Viologen Polymer Bilayer Electrochromic Films
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.
N. Leventis and Y. C. Chung, "Preparation and Characterization of Tungsten Trioxide/dibenzyl Viologen Polymer Bilayer Electrochromic Films," Journal of Materials Chemistry, Royal Society of Chemistry, Jan 1993.
The definitive version is available at http://dx.doi.org/10.1039/JM9930300833
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© 1993 Royal Society of Chemistry, All rights reserved.