Nano-scaled graphene plate films and articles

Patent metadata

Field	Value
Publication number	US-9233850-B2
Application number	US-78460607-A
Country	US
Kind code	B2
Filing date	Apr 9, 2007
Priority date	Apr 9, 2007
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

Disclosed is a nano-scaled graphene article comprising a non-woven aggregate of nano-scaled graphene platelets wherein each of the platelets comprises a graphene sheet or multiple graphene sheets and the platelets have a thickness no greater than 100 nm (preferably smaller than 10 nm) and platelets contact other platelets to define a plurality of conductive pathways along the article. The article has an exceptional thermal conductivity (typically greater than 500 Wm −1 K −1 ) and excellent electrical conductivity (typically greater than 1,000 S/cm). Thin-film articles of the present invention can be used for thermal management in micro-electronic devices and for current-dissipating on an aircraft skin against lightning strikes.

First claim

We claim:

1. A nano-scaled graphene article comprising a compressed, close packed, non-woven aggregate of nano-scaled graphene platelets wherein each of the platelets comprises a graphene sheet and the platelets have a thickness no greater than 100 nm, and wherein platelets contact other platelets to define a plurality of conductive pathways along the article.

2. The nano-scaled graphene article as defined in claim 1 wherein said article has a thickness smaller than 50 μm and the platelets have a thickness smaller than 10 nm.

3. The nano-scaled graphene article as defined in claim 1 wherein said article has a thickness smaller than 1 μm and the platelets have a thickness smaller than 10 nm.

4. The nano-scaled graphene article as defined in claim 1 wherein said article has a thickness smaller than 100 nm.

5. The nano-scaled graphene article as defined in claim 1 wherein said article has a thermal conductivity greater than 1,000 Wm −1 K −1 .

6. The nano-scaled graphene article as defined in claim 1 wherein said article has a thermal conductivity greater than 1,500 Wm −1 K −1 .

7. The nano-scaled graphene article as defined in claim 1 wherein said article has an electrical conductivity greater than 3,000 S/cm.

8. The nano-scaled graphene article as defined in claim 1 wherein said article has an electrical conductivity greater than 3,000 S/cm and a thermal conductivity greater than 1,000 Wm −1 K −1 .

9. The nano-scaled graphene article as defined in claim 1 further comprising a desired amount of a nano-scaled filler, having at least one dimension smaller than 100 nm, selected from the group consisting of a carbon nanotube, carbon nano fiber, carbon black, metal nano-powder, and combinations thereof, wherein said amount is no less than 0.1% by weight based on the total weight of said nano-scaled filler and the nano-scaled graphene platelets.

10. The nano-scaled graphene article as defined in claim 9 wherein said nano-scaled filler occupies a weight fraction no greater than 20%.

11. The nano-scaled graphene article of claim 9 wherein, when the article contains a matrix or binder material, the compressed aggregate is infiltrated or impregnated by the matrix or binder material.

12. The nano-scaled graphene article as defined in claim 9 further comprising a matrix or binder material that impregnates or infiltrates said article to form a composite article, wherein said binder or matrix material is selected from a carbon, graphite, metal, glass, or ceramic material.

13. The nano-scaled graphene article as defined in claim 12 wherein said composite article has an electrical conductivity greater than 200 S/cm or a thermal conductivity greater than 300 Wm −1 K −1 .

14. The nano-scaled graphene article as defined in claim 12 wherein said composite article has an electrical conductivity greater than 300 S/cm or a thermal conductivity greater than 500 Wm −1 K −1 .

15. The nano-scaled graphene article of claim 12 wherein the weight fraction of the platelets is not less than 75%.

16. The nano-scaled graphene article as defined in claim 1 wherein the platelets are over-lapping.

17. The nano-scaled graphene article of claim 1 wherein, when the article contains a matrix or binder material, the compressed aggregate is infiltrated or impregnated by the matrix or binder material.

18. The nano-scaled graphene article as defined in claim 17 wherein the article further comprises a matrix or binder material that impregnates or infiltrates said article to form a composite article, wherein said binder or matrix material is selected from a carbon, graphite, metal, glass, or ceramic material.

19. The nano-scaled graphene article as defined in claim 18 wherein said composite article has an electrical conductivity greater than 200 S/cm or a thermal conductivity greater than 300 Wm −1 K −1 .

20. The nano-scaled graphene article as defined in claim 18 wherein said composite article has an electrical conductivity greater than 300 S/cm or a thermal conductivity greater than 500 Wm −1 K −1 .

21. The nano-scaled graphene article of claim 18 wherein the weight fraction of the platelets is not less than 75%.

22. The nano-scaled graphene article of claim 1 wherein the aggregate is a thin film having a thickness no greater than 100 μm or paper.

23. The nano-scaled graphene article as defined in claim 1 wherein the aggregate is formed by dispersing separated platelets in a liquid medium and re-assembling the platelets in a layer by removing the liquid medium.

24. A nano-scaled graphene platelet-containing article comprising a compressed, close packed, non-woven aggregate of nano-scaled graphene platelets to form an electrical network of platelets in contact with other platelets to define a plurality of conductive pathways along the article wherein the article has an electrical conductivity no less than 200 S/cm or a thermal conductivity no less than 400 Wm −1 K −1 .

25. The nano-scaled graphene article of claim 24 wherein the article has an electrical conductivity no less than 1,000 S/cm or a thermal conductivity no less than 500 Wm −1 K −1 .

26. The nano-scaled graphene article as defined in claim 24 further comprising a matrix or binder material that impregnates or infiltrates said article to form a composite article.

27. The nano-scaled graphene article as defined in claim 26 wherein said composite article has an electrical conductivity greater than 1,000 S/cm or a thermal conductivity greater than 500 Wm −1 K −1 .

28. The nano-scaled graphene article as defined in claim 26 wherein said composite article has an electrical conductivity greater than 2,000 S/cm or a thermal conductivity greater than 1,000 Wm −1 K −1 .

29. The nano-scaled graphene article as defined in claim 26 wherein said binder or matrix material is selected from a resin, carbon, graphite, metal, glass, or ceramic material.

30. The nano-scaled graphene article as defined in claim 24 further comprising a desired amount of a nano-scaled filler selected from the group consisting of a carbon nanotube, carbon nano fiber, carbon black, metal nano-powder, and combinations thereof wherein said amount is no less than 0.1% by weight based on the total weight of said nano-scaled filler and the nano-scaled graphene platelets.

31. The nano-scaled graphene article of claim 24 wherein the weight fraction of the platelets is not less than 75%.

32. The nano-scaled graphene article of claim 24 wherein, when the article contains a matrix or binder material, the matrix or binder material infiltrates or impregnates the compressed aggregate.

33. The nano-scaled graphene article of claim 32 wherein the weight fraction of the platelets is not less than 75%.

34. The nano-scaled graphene article of claim 24 wherein the aggregate is a thin film having a thickness no greater than 100 μm or paper.

35. A nano-scaled graphene article comprising a compressed, close packed, non-woven aggregate of nano-scaled graphene platelets wherein the aggregate is formed by dispersing nano-scaled graphene platelets in a liquid medium and re-assembling the platelets in a layer by removing the liquid medium, each of the platelets comprises a graphene sheet and the platelets have a thickness not greater than 100 nm, and wherein

Assignees

• Jang Bor Z
• Zhamu Aruna
• Guo Jiusheng
• Nanotek Instruments Inc

Inventors

• Jang Bor Z
• Zhamu Aruna
• Guo Jiusheng

Classifications

• C04B35/522

  Graphite (C04B35/536 takes precedence) · CPC title

• C01B32/194

  After-treatment · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• H01B1/04

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title

• C01B2204/24

  Thermal properties · CPC title