US6045977A
Expired / Lapsed
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Process for patterning conductive polyaniline films
Assignee: Nokia of America Corp
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Filing: 1998-02-19
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Granted: 2000-04-04
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Expires: 2018-02-19
Abstract
Abstract A method for making a device in which a conductive polyaniline layer (polyaniline salt layer) is formed on a substrate and patterned into a desired configuration, is disclosed. The polyaniline salt containing layer is formed by applying a polyaniline salt solution which combines a mixture of polyaniline and an additive, dissolved in a solvent on the substrate. Thereafter, the polyaniline salt containing layer is patterned by delineating in such layer at least one region having a conductivity less than about 10-6 S/cm. The at least one region in the polyaniline salt containing layer having a conductivity less than about 10-6 S/cm is optionally formed by combining a photobase generator (PBG) with the polyaniline salt solution. An adhesive is optionally mixed with the polyaniline salt solution for forming an polyaniline salt/adhesive polymer layer which is patterned into the desired configuration.
Inventors
- 👤 Edwin Arthur Chandross
- 👤 Francis Michael Houlihan
- 👤 Afshin Partovi
- 👤 Xina Shu-Wen Quan
- 👤 Ganesh Venugopal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:40
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/128; G; G03; G03F; G03F7/00; G03F7/004; G03F7/0045; G03F7/09; G03F7/093
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
A method for fabricating a device, comprising the steps of: applying a solution which combines a mixture of polyaniline and an additive, dissolved in a solvent on a substrate, wherein the polyaniline has the structure ##STR1## wherein 0≦x≦1, wherein R is selected from the group consisting of an alkyl, and alkyl sulfonate, and an aryl, and wherein the additive dissociates and forms a polyaniline salt; evaporating the solvent to form a polyaniline salt containing layer on the substrate, wherein the polyaniline salt containing layer has a conductivity greater than about 10 -2 S/cm and wherein the polyaniline salt containing layer has a thickness less than about 10 microns; and delineating at least one region in the polyaniline salt containing layer wherein the at least one region has a conductivity less than about 10 -6 S/cm.
Claim 2
Independent Claim
135 words
A method for fabricating a device, comprising the steps of: applying a solution which combines a mixture of polyaniline and an additive, dissolved in a solvent on a substrate, wherein the polyaniline has the structure ##STR1## wherein 0≦x≦1, wherein R is selected from the group consisting of an alkyl, and alkyl sulfonate, and an aryl, and wherein the additive dissociates and forms a polyaniline salt; evaporating the solvent to form a polyaniline salt containing layer on the substrate, wherein the polyaniline salt containing layer has a conductivity greater than about 10 -2 S/cm and wherein the polyaniline salt containing layer has a thickness less than about 10 microns; and delineating at least one region in the polyaniline salt containing layer wherein the at least one region has a conductivity less than about 10 -6 S/cm.
Claim 3
Dependent Claim
119 words
The method of claim 1 wherein delineation of the at least one region in the polyaniline salt containing layer comprises the steps of: forming a layer of energy sensitive resist material over the polyaniline salt containing layer; introducing an image of a pattern into the energy sensitive resist material by exposing the energy sensitive resist material to patterned radiation; developing the pattern with an aqueous basic solution, wherein the aqueous basic solution removes the irradiated energy sensitive resist material and wherein the aqueous basic solution that contacts uncovered areas of the underlying polyaniline salt containing layer forms the at least one region having the conductivity less than about 10 -6 S/cm; and removing the unexposed energy sensitive resist material.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein the aqueous basic solution is selected from the group consisting of sodium hydroxide and tetramethylammonium hydroxide.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the additive is selected from the group consisting of camphorsulfonic acid and alkylbenzenesulfonic acid.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the solvent is selected from the group consisting of 2,2,2-trifluoroethanol and cyclohexanone.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the additive is camphorsulfonic acid and the solvent is 2,2,2-trifluoroethanol.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein the mixture further comprises an energy sensitive compound that generates a basic moiety when exposed to radiation.
Claim 9
Dependent Claim
71 words
The method of claim 7 wherein delineation of the at least one region in the polyaniline salt containing layer comprises introducing an image of a pattern into the polyaniline salt containing layer by exposing the polyaniline salt containing layer to patterned radiation, wherein the basic moiety generated by the energy sensitive compound forms the at least one region in the polyaniline layer having the conductivity less than about 10 -6 S/cm.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein the mixture further comprises an adhesive polymer.
Claim 11
Dependent Claim
25 words
The method of claim 9 wherein the adhesive polymer is selected from the group consisting of thermoplastic adhesives, hot-melt adhesives and ultraviolet radiation curable adhesives.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 2003-04-04 | 2003-10-04 | 2004-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-04 | 2007-10-04 | 2008-04-04 | $3760.00 | Window Closed / Lapsed |
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