Field emission element with carbon nanotube yarn

• US 7,550,907 B2
• Filed: 08/11/2006
• Issued: 06/23/2009
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Original Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Inventors: Fan, Shou-Shan, Liu, Peng, Jiang, Kai-Li, Wei, Yang, Zhang, Xiao-Bo
• Primary Examiner(s): Ton; Toan
• Assistant Examiner(s): FEATHERLY, HANA SANEI
• Application Number:
  US11/502,850
• Publication Number:
  US 20070144780A1
• Time in Patent Office: 1,047 Days
• Field of Search: 313/309, 313495-497, 313/310
• US Class Current: 313/309
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: H01J 1/304 Field-emissive cathodes
• CPC Class Codes: H01J 2201/30469 Carbon nanotubes (CNTs)
• CPC Class Codes: H01J 9/025 of field emission cathodes

Abstract

A field emission element (100) includes an elongated solid body (110), a carbon nanotube yarn (112) and an electrically conductive adhesive agent (114). The carbon nanotube yarn wraps round the elongated solid body. The electrically conductive adhesive agent is applied between the elongated solid body and the carbon nanotube yarn, and the electrically conductive adhesive agent is configured for fixing the carbon nanotube yarn to the elongated solid body. The substantially all of carbon nanotube yarn is entirely adhered on a peripheral surface of the elongated solid body.

Claims

1. A field emission clement, comprising:

an elongated solid body;

a carbon nanotube yarn wrapping round the elongated solid body;

an electrically conductive adhesive agent applied between the elongated solid body and the carbon nanotube yarn, the electrically conductive adhesive agent being configured for fixing the carbon nanotube yarn to the elongated solid body, wherein substantially all of the carbon nanotube yarn is entirely adhered on a peripheral surface of the elongated solid body by the adhesive agent.

2. The field emission element of claim 1, wherein a diameter of the carbon nanotube yarn is in a range from 2 to 200 microns.

3. The field emission element of claim 1, wherein the conductive adhesive agent is comprised of terpineol, ethyl cellulose, electrically conductive metallic powder and low-melting-point glass powder.

4. The field emission element of claim 1, wherein the conductive adhesive agent is comprised of electrically conductive adhesive chosen from the group consisting of gold, silver, palladium, nickel, copper, and appropriate combination thereof.

5. The field emission element of claim 1, wherein the conductive binder agent is chosen from the group consisting of electrically conductive epoxy resin, electrically conductive paint and electrically conductive polymer material.

6. The field emission element of claim 1, wherein the elongated solid body is an electrically conductive rod.

7. The field emission element of claim 6, wherein a diameter of the electrically conductive rod is in a range from 10 microns to 10 millimeters.

8. The field emission element of claim 1, wherein the elongated solid body has an electrically conductive circumferential surface.

9. The field emission element of claim 1, wherein the carbon nanotube yarn and the elongated solid body have a linear contact.

10. The field emission element of claim 1, wherein the elongated solid body has a shape selected from the group consisting of cylindrical, rectangular-parallelepiped, and conical.

11. The field emission element of claim 1, wherein the carbon nanotube yarn comprises a plurality of carbon nanotube bundles that are joined end to end by van der Waals force.

12. The field emission element of claim 11, wherein each carbon nanotube bundles comprises a plurality of carbon nanotubes substantially parallel to each other.

13. The field emission element of claim 11, wherein each carbon nanotube bundle is joined with the adjacent carbon nanotubes bundles.

14. The field emission element of claim 1, wherein two or more carbon nanotube yarns are intertwined with each other.

15. A field emission element, comprising

an elongated solid body;

a carbon nanotube yarn helically twining around the elongated solid body along an orientation of the axis direction thereof;

an electrically conductive adhesive agent applied between the elongated solid body and the carbon nanotube yarn, the electrically conductive adhesive agent being configured for fixing the carbon nanotube yarn to the elongated solid body, wherein the carbon nanotube yarn is entirely adhered on a peripheral surface of the elongated solid body.

16. The field emission element of claim 15, wherein the carbon nanotube yarn comprises a plurality of carbon nanotube bundles that are joined end to end by van der Waals force.

17. The field emission element of claim 16, wherein the carbon nanotube bundles each comprises a plurality of carbon nanotubes substantially parallel to each other.

18. The field emission element of claim 16, wherein each carbon nanotube bundle is joined with the adjacent carbon nanotubes bundles.

19. The field emission element of claim 15, wherein two or more carbon nanotube yarns are made to intertwine with each other.