Single crystalline graphene sheet and process of preparing the same

Patent metadata

Field	Value
Publication number	US-9534312-B2
Application number	US-201615042438-A
Country	US
Kind code	B2
Filing date	Feb 12, 2016
Priority date	Dec 17, 2007
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A single-crystal graphene sheet includes a polycyclic aromatic molecule wherein a plurality of carbon atoms are covalently bound to each other, the single-crystal graphene sheet comprising between about 1 layer to about 300 layers; and wherein a peak ratio of a Raman D band intensity to a Raman G band intensity is equal to or less than 0.2. Also described is a method for preparing a single-crystal graphene sheet, the method includes forming a catalyst layer, which includes a single-crystal graphitizing metal catalyst sheet; disposing a carbonaceous material on the catalyst layer; and heat-treating the catalyst layer and the carbonaceous material in at least one of an inert atmosphere and a reducing atmosphere. Also described is a transparent electrode including a single-crystal graphene sheet.

First claim

What is claimed is:

1. A method for preparing a single-crystal graphene sheet, the method comprising:
forming a catalyst layer, the catalyst layer comprising a single-crystal graphitizing metal catalyst sheet;
disposing a carbonaceous material on the catalyst layer; and
heat-treating the catalyst layer and the carbonaceous material in at least one of an inert atmosphere and a reducing atmosphere to form a single-crystal graphene sheet.

2. The method of claim 1 , wherein the carbonaceous material is solid-solubilized in the catalyst layer.

3. The method of claim 1 , wherein the catalyst layer comprises a metal selected from the group consisting of Ni, Co, Fe, Pt, Au, Al, Cr, Cu, Mg, Mn, Mo, Rh, Si, Ta, Ti, W, U, V, Zr, a combination comprising at least one of the foregoing metals, and an alloy comprising at least one of the foregoing metals.

4. The method of claim 1 , wherein the disposing a carbonaceous material on the catalyst layer comprises coating a carbon-containing polymer on a surface of the catalyst layer.

5. The method of claim 4 , wherein the carbon-containing polymer is a self-assembling polymer.

6. The method of claim 4 , wherein the carbon-containing polymer is a polymer selected from the group consisting of an amphiphilic polymer, a liquid crystal polymer, a conductive polymer, and a combination comprising at least one of the foregoing polymers.

7. The method of claim 4 , wherein the carbon-containing polymer comprises a polymerizable functional group.

8. The method of claim 1 , wherein the disposing a carbonaceous material on the catalyst layer comprises disposing a carbon-containing gas on the catalyst layer.

9. The method of claim 8 , wherein the heat-treating is performed at a temperature between about 300° C. to about 2,000° C. for a time between about 0.001 hours to about 1000 hours.

10. The method of claim 8 , wherein the carbon-containing gas is a gas selected from the group consisting of carbon monoxide, ethane, ethylene, ethanol, acetylene, propane, propylene, butane, butadiene, pentane, pentene, cyclopentadiene, hexane, cyclohexane, benzene, toluene, and a combination comprising at least one of the foregoing gases.

11. The method of claim 1 , wherein the disposing a carbonaceous material on the catalyst layer is performed by immersing the catalyst layer in a liquid, wherein the liquid comprises the carbonaceous material.

12. The method of claim 1 , wherein the heat-treating the catalyst layer comprises:
a first heat-treating at a temperature and for a time sufficient to solid-solubilize the carbonaceous material in the catalyst layer; and
a second heat-treating at a temperature and for a time sufficient to precipitate the solid-solubilized carbonaceous material and form a single-crystal graphene sheet.

13. The method of claim 1 , wherein the disposing a carbonaceous material on the catalyst layer is performed by coating a carbon-containing polymer on a surface of the catalyst layer, wherein the heat-treating is performed at a temperature between about 300° C. to about 2,000° C. and for a time between about 0.001 hours to about 1000 hours.

14. The method of claim 1 , further comprising separating the single-crystal graphene sheet from the catalyst layer by removing the catalyst layer by treating the single-crystal graphene sheet and the catalyst layer with an acid after the heat-treating.

15. A method for preparing a single-crystal graphene sheet, comprising:
forming a catalyst layer, the catalyst layer comprising a single-crystal graphitizing metal catalyst sheet;
disposing a self-assembling polymer on the catalyst layer;
heat-treating the catalyst layer and the self-assembling polymer in at least one of an inert atmosphere and a reducing atmosphere to solid-solubilize a carbonaceous material in the catalyst layer; and
heat-treating at a temperature and for a time sufficient to precipitate the solid-solubilized carbonaceous material and form a single-crystal graphene sheet.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Jae-Young
• Shin Hyeon-Jin
• Yoon Seon-Mi
• Han Jai-Yong

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C30B29/02

  Elements · CPC title

• C01B2204/04

  Specific amount of layers or specific thickness · CPC title

• B82Y30/00 Primary

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

• C01B31/0461

  Chemistry & Metallurgy · mapped topic