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Compositions for Use in Optically Printing High Conductive Characters

IP.com Disclosure Number: IPCOM000089823D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Engler, EM: AUTHOR [+3]

Abstract

This article describes pi-organic donors other than tetrathiafulvalene derivatives, which are useful in the optical printing of high conductivity patterns.

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Compositions for Use in Optically Printing High Conductive Characters

This article describes pi-organic donors other than tetrathiafulvalene derivatives, which are useful in the optical printing of high conductivity patterns.

The general requirements for organic pi-donors to operate in this optical printing process are summarized below:

1) Low oxidation potential donors with oxidation potentials <1 eV vs standard calomel electrode.

2) The ability to form weak charge-transfer complexes with halo-carbon solvents; these complexes possess charge transfer absorptions in the range of actinic radiation.

3) The ability to form high conductivity halide salts.

Several new donor systems which possess the above properties are: tetrathia- and tetraselenatetracenes (I), pyranylidene and dithiapyranylidene derivatives (II), and 3,3'-bis(1,2-dithiole) derivatives (III).

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These donors are expected to undergo photochemical reaction in halocarbon solvents to give conducting donor-halide patterns. For example, a solution containing 1 mg/ml of tetrathiatetracene (1, X=S) in a 1:1 solvent mixture of CCl(4) and chlorobenzene is coated on a substrate (paper, glass, etc.) and covered with a mask. The mask is then illuminated with low intensity ultraviolet radiation for several minutes, removed, and excess solvent allowed to evaporate. A dark red purple conducting image was deposited on the substrate with a resolution better than 7 lines per millimeter.

Other classes of org...