Enriched macromolecular materials having temperature-independent high electrical conductivity and methods of making same

• US 20030156375A1
• Filed: 02/18/2003
• Published: 08/21/2003
• Est. Priority Date: 08/06/1998
• Status: Active Grant

• Current Assignee: Kevin P. Shambrook, Leonid N. Grigorov
• Original Assignee: Kevin P. Shambrook, Leonid N. Grigorov
• Inventors: Grigorov, Leonid N., Shambrook, Kevin P.
• Granted Patent: US 6,804,105 B2
• Time in Patent Office: Days
• US Class Current: 361/225
• CPC Class Codes: H01B 1/12 organic substances organic macromolecular compounds or compositions C08
• CPC Class Codes: H01L 2224/16 of an individual bump connector
• CPC Class Codes: H01L 23/552 Protection against radiation, e.g. light or electromagnetic waves
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/01019 Potassium [K]
• CPC Class Codes: H01L 2924/01021 Scandium [Sc]
• CPC Class Codes: H01L 2924/01077 Iridium [Ir]
• CPC Class Codes: H01L 2924/01079 Gold [Au]
• CPC Class Codes: H01L 2924/10253 Silicon [Si]
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H10N 10/17 characterised by the structure or configuration of the cell or thermocouple forming the device
• CPC Class Codes: H10N 10/856 comprising organic compositions

Abstract

A polymer material comprising channels whose temperature-independent conductivity exceeds 10⁶ S/cm is used to form conductive films. Conduction takes place through threads and channels passing through the film which is otherwise a dielectric. The film is produced by first depositing a macromolecular polymer substance on a substrate. During preparation, the substance is preferably in a viscous liquid state. Stable free electrons (polarons) are then created by ionizing the substance. This is assisted by exposure to UV radiation and the presence of strong polar groups in the polymer. Various enrichment techniques, such as applying a strong electric field, are then used to join the superpolarons together into conductive threads within the medium. To stabilize the positions of the threads, the medium then may be solidified, preferably by cooling it below its glass transition point or inducing cross-linking between the macromolecules. The film may be a membrane. Devices incorporating these films include electrical interposers, thermoelectric devices, thermally insulating electrical connectors, pressure switches, field emission devices and fault current limiters. The films can also be used to protect conductors from chemical corrosion without electrically insulating them. They also find application as electromagnetic shielding, reflectors, and polarizers.

Claims

1. A method for increasing a concentration of free electrons in a macromolecular material, the method comprising:

a) subjecting the macromolecular material to an electromagnetic field that increases the concentration of free electrons within a region of the macromolecular material; and

b) extracting a portion of material within the region to obtain an enriched material having a concentration of free electrons greater than an original concentration of free electrons in the macromolecular material.

2. The method of claim 1 wherein the electromagnetic field is a non-uniform electric field.

3. The method of claim 1 wherein the electromagnetic field is a high intensity magnetic field.

4. The method of claim 1 wherein the electromagnetic field is an alternating electromagnetic field.

5. The method of claim 1 further comprising the step of heating the material while it is subjected to the electromagnetic field.

6. The method of claim 1 wherein the enriched material has a density of free electrons of at least 10¹⁸ per cubic centimeter.

7. The method of claim 1 wherein the enriched material comprises conductive regions having conductivity greater than 10⁶ S/cm.

8. An enriched macromolecular material comprising a plurality of conductive regions, wherein a density of free electrons in the material is at least 10¹⁸ per cubic centimeter and wherein the conductive regions have conductivity greater than 10⁶ S/cm at temperatures below a temperature of decomposition of the material.

9. The material of claim 8 wherein the conductive regions have conductivity greater than 10¹¹ S/cm.

10. The material of claim 8 wherein the macromolecular material comprises a nonconjugated polymer.

16. The conductive material of claim 8 wherein the enriched material has a free electron density of at least 10¹⁹ free electrons per cubic centimeter.

11. A material comprising a cross-linked nonconjugated polymer having regions of conductivity greater than 10⁶ S/cm.

12. The material of claim 11 wherein the density of free electrons in the material is at least 10¹⁸ per cubic centimeter.

13. A conductive material produced according to the following method:

a) increasing a density of free electrons in a macromolecular medium to produce an enriched material having a free electron density of at least 10¹⁸ free electrons per cubic centimeter; and

b) forming the conductive material from the enriched material, wherein the conductive material has a conductivity of at least 10⁶ S/cm.

14. The material of claim 13 wherein forming the conductive material comprises forming a film from the enriched material.

15. The material of claim 13 wherein forming the conductive material comprises forming a conductor from the enriched material comprising a thread or a plurality of parallel threads.

17. A macromolecular film having a free electron density of at least 10¹⁸ free electrons per cubic centimeter, comprising parallel threads with conductivity of at least 10⁶ S/cm at temperatures below a temperature of decomposition of the material.

18. The film of claim 17 wherein wherein the threads are channels oriented substantially perpendicular to a surface of the film, and wherein the channels electrically connect points on opposing sides of the film.