Graphene sheet comprising an intercalation compound and process of preparing the same

Patent metadata

Field	Value
Publication number	US-9776378-B2
Application number	US-201213549861-A
Country	US
Kind code	B2
Filing date	Jul 16, 2012
Priority date	Feb 17, 2009
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A graphene sheet including an intercalation compound and 2 to about 300 unit graphene layers, wherein each of the unit graphene layers includes a polycyclic aromatic molecule in which a plurality of carbon atoms in the polycyclic aromatic molecule are covalently bonded to each other; and wherein the intercalation compound is interposed between the unit graphene layers.

First claim

What is claimed is:

1. A graphene sheet, comprising:
an intercalation compound comprising a carbon-containing compound; and
2 to about 300 unit graphene layers,
each of the unit graphene layers comprises a polycyclic aromatic molecule in which a plurality of carbon atoms in the polycyclic aromatic molecule are covalently bonded to each other; and
wherein the intercalation compound is interposed between the unit graphene layers, and
wherein the carbon-containing compound is at least one of a carbon nanofiber, a carbon nanoparticles, a graphite, a carbon nanotube, a fullerene, and any mixtures thereof.

2. The graphene sheet of claim 1 , wherein the intercalation compound is regularly and periodically arranged.

3. The graphene sheet of claim 1 , wherein about 1 to about 4 unit graphene layers are interposed between layers comprising the intercalation compound.

4. The graphene sheet of claim 1 , wherein, the graphene sheet has a tetragonal structure and each of a width and a length of the graphene sheet is about 1 to about 1,000 millimeters.

5. The graphene sheet of claim 1 , wherein the graphene sheet has a circular shape and a diameter of the graphene sheet is about 1 to about 1,000 millimeters.

6. A process of preparing the graphene sheet comprising an intercalation compound according to claim 1 , the process comprising:
forming a graphene sheet; and
intercalating an intercalation compound into the graphene sheet using at least one method selected from the group consisting of 2-region vapor phase transport, constant temperature vapor phase transport, an electrochemical method, liquid phase intercalation, and any mixtures thereof,
wherein the intercalation compound comprises a carbon-containing compound selected from the group consisting of a carbon nanofiber, a carbon nanoparticles, a graphite, a carbon nanotube, a fullerene, and any mixtures thereof.

7. The process of claim 6 , wherein the 2-region vapor phase transport comprises:
disposing the graphene sheet in a first chamber of a reactor and disposing the intercalation compound in a second chamber of the reactor, wherein the first chamber and the second chamber are connected to each other through a pathway; and
independently heating each of the first chamber and the second chamber.

8. The process of claim 6 , wherein the constant temperature vapor phase
transport comprises supplying a vapor phase intercalation compound into a chamber in which the graphene sheet is disposed, wherein the temperature of the chamber is maintained at a constant temperature.

9. The process of claim 6 , wherein the liquid phase intercalation comprises immersing the graphene sheet in a liquid phase intercalation compound or in a solution of an intercalation compound to form an intercalated graphene sheet, and drying the intercalated graphene sheet.

10. The process of claim 6 , wherein the electrochemical method comprises
intercalating the intercalation compound into the graphene sheet by electrolysis in an electrolyte using the graphene sheet as an electrode and the intercalation compound as a counter electrode.

11. The process of claim 6 , wherein at least two methods selected from the
group consisting of 2-region vapor phase transport, constant temperature vapor phase transport, an electrochemical method, and liquid phase intercalation are sequentially performed.

12. The process of claim 6 , wherein the forming the graphene sheet comprises:
preparing a substrate having a graphitizing catalyst disposed on at least one surface of the substrate;
contacting a carbonaceous material with the substrate on which the graphitizing catalyst is disposed; and
heat treating the carbonaceous material and the graphitizing catalyst in an inert or a reducing atmosphere to form graphene.

13. The process of claim 12 , wherein the graphitizing catalyst has a single
crystalline structure.

14. The process of claim 12 , wherein the contacting the carbonaceous material with the substrate is performed using at least one method selected from the group consisting of:
coating the carbonaceous material on the substrate on which the graphitizing catalyst is disposed, wherein the carbonaceous material is a carbon containing polymer;
supplying the carbonaceous material onto the substrate on which the graphitizing catalyst is disposed, wherein the carbonaceous material is a gaseous carbonaceous material; and
immersing the substrate on which the graphitizing catalyst is disposed in the carbonaceous material to form an immersed substrate, and pre-heat-treating the immersed substrate, wherein the carbonaceous material is a liquid carbonaceous material and any combinations thereof.

15. The process of claim 12 , further comprising removing the graphitizing
catalyst by acid treatment after the heat treatment.

16. The process of claim 6 , wherein the intercalation compound comprises a
carbon-containing compound selected from the group consisting of a carbon nanofiber, a carbon nanoparticles, a graphite, a carbon nanotube, a fullerene, and any mixtures thereof.

17. A process of preparing the graphene sheet comprising an intercalation compound according to claim 1 , the process comprising:
intercalating an intercalation compound into graphite using at least one method selected from the group consisting of 2-region vapor phase transport, constant temperature vapor phase transport, an electrochemical method, and liquid phase intercalation;
mechanically cutting the graphite into which the intercalation compound is intercalated; and
repeating the cutting of the graphite to obtain a graphene sheet comprising an intercalation compound,
wherein the intercalation compound comprises a carbon-containing compound selected from the group consisting of a carbon nanofiber, a carbon nanoparticles, a graphite, a carbon nanotube, a fullerene, and any mixtures thereof.

18. The process of claim 17 , wherein the mechanically cutting comprises separating graphite using an adhesive tape.

19. A transparent electrode comprising a graphene sheet comprising an intercalation compound according to claim 1 .

20. A solar cell comprising the transparent electrode of claim 19 .

21. A conductive thin film comprising a graphene sheet comprising an intercalation compound according to claim 1 .

22. A display device comprising the conductive thin film of claim 21 .

23. A hydrogen storage medium comprising a graphene sheet comprising an intercalation compound according to claim 1 .

24. An electrical device comprising a graphene sheet comprising an intercalation compound according to claim 1 .

Assignees

• Choi Jae-Young
• Samsung Electronics Co Ltd

Inventors

• Choi Jae-Young

Classifications

• B82Y30/00

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

• C23C16/56

  After-treatment · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• H01L31/022425

  Electricity · mapped topic

• H05B33/28

  of translucent electrodes · CPC title