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Counter-Electrode Comprising Platinum-Black Dispersion

IP.com Disclosure Number: IPCOM000043829D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Jones, AS: AUTHOR [+3]

Abstract

A counter-electrode, e.g., for an electrochromic display, comprises a dispersion of platinum-black in an acrylic polymer binder. The dispersion is screen printed onto a glass substrate. The specific surface area of platinum-black is increased by subjecting the cured electrode to an oxidizing plasma discharge which removes the surface binder. In the case of an electrochromic display the counter-electrode is formed on a glass cover plate which is clamped over the body of the display cell, as described in a previous article [*]. As in that article a layer of gold over titanium is first deposited on the cover plate to provide a conductor pattern for electrically connecting the counter-electrode to the edge of the cover plate beyond a clamping seal.

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Counter-Electrode Comprising Platinum-Black Dispersion

A counter-electrode, e.g., for an electrochromic display, comprises a dispersion of platinum-black in an acrylic polymer binder. The dispersion is screen printed onto a glass substrate.

The specific surface area of platinum-black is increased by subjecting the cured electrode to an oxidizing plasma discharge which removes the surface binder. In the case of an electrochromic display the counter-electrode is formed on a glass cover plate which is clamped over the body of the display cell, as described in a previous article [*]. As in that article a layer of gold over titanium is first deposited on the cover plate to provide a conductor pattern for electrically connecting the counter-electrode to the edge of the cover plate beyond a clamping seal. However, instead of electroplating the platinum-black forming the counter-electrode over a portion of the conductor pattern, a dispersion of platinum-black particles of up to 1 micron in size is silk screened onto the conductor pattern. The binder is 5% by weight methyl methacrylate polymer dissolved in 5% by weight dichloromethane solvent. Platinum-black particles make up the remaining 90% by weight. A thickness of between .01 and 0.4 mm of paste is applied and is heated for 4 hours at 120OEC to remove the solvent. The cured counter-electrode is then subjected to a plasma oxidizing discharge 100 watts in air at 10-1mm pressure to remove the binder at the surface. This...