Graphene with nanosized openings

Patent metadata

Field	Value
Publication number	US-11407644-B2
Application number	US-201916722313-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Dec 21, 2018
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

Synthesizing holey graphene oxide includes dispersing graphene oxide in an aqueous solution to yield a first graphene oxide dispersion, irradiating the first graphene oxide dispersion with microwave radiation, thereby at least partially reducing the graphene oxide in the first graphene oxide dispersion to yield a second graphene oxide dispersion that includes partially reduced graphene oxide, combining the second graphene oxide dispersion with an etching agent to form a third graphene oxide dispersion, and irradiating the third graphene oxide dispersion with microwave radiation to yield a fourth graphene oxide dispersion comprising holey graphene oxide.

First claim

What is claimed is:

1. A method of synthesizing holey graphene oxide, the method comprising:
dispersing graphene oxide in an aqueous solution to yield a first graphene oxide dispersion;
irradiating the first graphene oxide dispersion with microwave radiation, thereby at least partially reducing the graphene oxide in the first graphene oxide dispersion to yield a second graphene oxide dispersion comprising at least partially reduced graphene oxide;
combining the second graphene oxide dispersion with an etching agent to form a third graphene oxide dispersion; and
irradiating the third graphene oxide dispersion with microwave radiation to yield a fourth graphene oxide dispersion comprising holey graphene oxide.

2. The method of claim 1 , wherein the graphene oxide comprises graphene oxide nanosheets.

3. The method of claim 1 , wherein a power of the microwave radiation is in a range between 50 W and 400 W.

4. The method of claim 1 , further comprising stirring the first graphene oxide dispersion while irradiating the first graphene oxide dispersion.

5. The method of claim 1 , wherein irradiating the first graphene oxide dispersion comprises irradiating the first graphene oxide dispersion for a length of time between 90 seconds and 360 seconds.

6. The method of claim 1 , wherein partially reducing the graphene oxide comprises removing functional groups from the graphene oxide.

7. The method of claim 1 , wherein the etching agent comprises one or more of hydrogen peroxide, HNO 3 , KOH, Co, and O 2 .

8. The method of claim 1 , wherein irradiating the third graphene oxide dispersion occurs in a sealed vessel.

9. The method of claim 1 , wherein irradiating the third graphene oxide dispersion comprises irradiating the first graphene oxide dispersion for a length of time between 45 seconds and 180 seconds.

10. The method of claim 1 , further comprising stirring the third graphene oxide dispersion while irradiating the third graphene oxide dispersion.

11. The method of claim 1 , wherein the fourth graphene oxide dispersion comprises a plurality of holey graphene oxide nanosheets.

12. The method of claim 10 , wherein each holey graphene oxide nanosheet defines a plurality of openings through a plane of the holey graphene oxide nanosheet.

13. The method of claim 12 , wherein each opening in the plurality of openings has a diameter in a range of 1 nm to 100 nm.

14. The method of claim 12 , wherein openings of the plurality of openings are uniformly distributed on each holey graphene nanosheet.

15. The method of claim 12 , wherein the plane is the basal plane of the nanosheet.

16. The method of claim 1 , further comprising reducing the holey graphene oxide to yield reduced holey graphene oxide.

17. The method of claim 1 , wherein the C/O ratio of the holey graphene oxide is equal to or greater than the C/O ratio of the graphene oxide in the first graphene oxide dispersion.

18. The method of claim 1 , wherein synthesizing the holey graphene oxide occurs in less than one hour.

19. The method of claim 1 , wherein irradiating the first graphene oxide dispersion results in the formation of vacancy defects on the graphene oxide by electromagnetic wave-induced heating.

20. The method of claim 1 , wherein irradiating the first graphene oxide dispersion results in nonlinear heating of the first graphene oxide dispersion.

Assignees

• Nian Qiong
• Wang Dini
• Univ Arizona State

Inventors

• Nian Qiong
• Wang Dini

Classifications

• C01B32/192 Primary

  starting from graphitic oxides · CPC title

• C01B32/198

  Graphene oxide · CPC title

• C01P2004/17

  Nanostrips, nanoribbons or nanobelts, i.e. solid nanofibres with two significantly differing dimensions between 1-100 nanometer · CPC title