Large-area electrochromic coatings: Composites of polyaniline and polyacrylate-silica hybrid sol-gel materials
- Gumbs Associates, Inc., East Brunswick, NJ (United States)
- Drexel Univ., Philadelphia, PA (United States). Dept. of Chemistry
A low-cost technique for fabricating large-area electrochromic coatings is described. Polyaniline was incorporated into polyacrylate-silica hybrid sol-gel networks using suspended particles or solutions. A solution of polyaniline and poly[methyl methacrylate-co-3-(trimethoxysilyl)propyl methacrylate] can be spray- or brush-coated on transparent indium-tin oxide substrates to form robust electrochromic coatings. Silane functional groups on the polyacrylate chain act as coupling and cross-linking agents to improve surface adhesion and mechanical properties of the resulting composite coatings. These coatings showed reversible transparent to green color change when polarized at potentials between {minus}0.4 and +0.4 V vs. Ag/AgCl in a 0.2 M LiClO{sub 4}/acetonitrile electrolyte solution. The cycle lifetimes of polyaniline films were improved by incorporating the polymer in the polyacrylate-silica matrix. Electrochromic switching was demonstrated for the composite coatings in large-area all-solid-state devices.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG05-93ER81632
- OSTI ID:
- 413411
- Journal Information:
- Journal of the Electrochemical Society, Vol. 143, Issue 8; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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