Single-step, solvent-free, catalyst-free preparation of holey carbon allotropes

Patent metadata

Field	Value
Publication number	US-9567225-B2
Application number	US-201414513813-A
Country	US
Kind code	B2
Filing date	Oct 14, 2014
Priority date	Oct 11, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

Methods for forming holey carbon allotropes and graphene nanomeshes are provided by the various embodiments. The various embodiments may be applicable to a variety of carbon allotropes, such as graphene, graphene oxide, reduced graphene oxide, thermal exfoliated graphene, graphene nanoribbons, graphite, exfoliated graphite, expanded graphite, carbon nanotubes (e.g., single-walled carbon nanotubes, double-walled carbon nanotubes, few-walled carbon nanotubes, multi-walled carbon nanotubes, etc.), carbon nanofibers, carbon fibers, carbon black, amorphous carbon, fullerenes, etc. The methods may produce holey carbon allotropes without the use of solvents, catalysts, flammable gas, additional chemical agents, or electrolysis to produce the pores (e.g., holes, etc.) in the carbon allotropes. In an embodiment, a carbon allotrope may be heated at a working window temperature for a working period of time to create holes in the carbon allotrope.

First claim

What is claimed is:

1. A method of forming a holey carbon allotrope, comprising:
providing a carbon allotrope; and
heating the provided carbon allotrope in air at a working window temperature for a working period of time at atmospheric pressure to create pores in the provided carbon allotrope;
wherein heating the provided carbon allotrope is performed without the addition of solvents, catalysts, or additional chemical agents; and
wherein the working window temperature is from about 100° C. to about 800° C. and
the working period of time is from about 1 minute to about 24 hours.

2. The method of claim 1 , wherein the created pores have a radius size of about 1 nanometer to about 100 nanometers.

3. The method of claim 2 , wherein heating the provided carbon allotrope at the working window temperature for the working period of time to create pores in the provided carbon allotrope is performed without the addition of flammable gasses or electrolysis.

4. The method of claim 2 , wherein heating the provided carbon allotrope is performed by thermal heating, mechanical heating, microwave heating, infrared heating, laser beam heating, mechanochemical heating, electrochemical heating, electron bombardment, ion bombardment, electromagnetic heating, or any combination of the foregoing.

5. The method of claim 2 , wherein the working window temperature is from about 150° C. to about 500° C.

6. The method of claim 5 , wherein the working window temperature is from about 300° C. to about 500° C.

7. The method of claim 2 , wherein:
the working window temperature is about 400° C. or more; and
the working period of time is about 1 hour.

8. The method of claim 7 , wherein the working window temperature is about 450° C.

9. The method of claim 2 , wherein:
the working window temperature is about 400° C. or more; and
the working period of time is about 3 hours.

10. The method of claim 9 , wherein the working window temperature is about 450° C.

11. The method of claim 2 , wherein:
the working window temperature is about 350° C. or more; and
the working period of time is about 10 hours.

12. The method of claim 11 , wherein the working window temperature is about 400° C.

13. The method of claim 2 , wherein:
the working window temperature is about 500° C. or more; and
the working period of time is about 20 minutes.

14. The method of claim 13 , wherein the working window temperature is about 500° C.

15. The method of claim 2 , wherein the provided carbon allotrope is at least one selected from the group consisting of graphene, graphene oxide, reduced graphene oxide, thermal exfoliated graphene, graphene nanoribbons, graphite, exfoliated graphite, expanded graphite, single-walled carbon nanotubes, double-walled carbon nanotubes, few-walled carbon nanotubes, multi-walled carbon nanotubes, carbon nanofibers, carbon fibers, carbon black, amorphous carbon, and fullerenes.

16. The method of claim 2 , wherein a form of the provided carbon allotrope is at least one selected from the group consisting of a sheet, a mat, a roving, a yarn, a thread, and a filament.

17. The method of claim 16 , wherein constituents of the form of the provided carbon allotrope are at least partially aligned in a same direction.

18. The method of claim 1 , wherein the pores of the holey carbon allotrope have a radius size of about 1 nanometer to about 20 nanometers and wherein the BET surface area of the holey carbon allotrope is at least 461 m 2 /g.

19. The method of claim 16 ,
wherein an electrode is formed from the holey carbon allotrope, and
wherein the pores of the holey carbon allotrope have a radius size of about 1 nanometer to about 20 nanometers and wherein the BET surface area of the holey carbon allotrope is at least 461 m 2 /g.

Assignees

• Nasa

Inventors

• Lin Yi
• Kim Jae-Woo
• Connell John W
• Funk Michael R
• Campbell Caroline J

Classifications

• C01B32/194

  After-treatment · CPC title

• C01B32/168 Primary

  After-treatment · CPC title

• C01B32/156

  After-treatment · CPC title

• C01B32/21

  After-treatment · CPC title

• C01P2006/16

  Pore diameter · CPC title