Title

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.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1993 Royal Society of Chemistry, All rights reserved.


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