# US 9,434,620 B2 · Method for producing foam-shaped graphene structure by boiling, and foam-shaped graphene structure using same

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- Number: US 9,434,620 B2
- Document ID: US9434620B2
- Status: Granted
- Kind: B2
- Application number: 14/425,603
- Filed: 2013-05-10
- Published: 2015-09-10
- Granted: 2016-09-06
- Earliest claimed: 2012-09-03
- Assignees: Postech Academy-Industry Foundation
- Applicants: Postech Academy-Industry Foundation
- Inventors: Moo Hwan Kim; Ho Seon Ahn; Ji Wook Jang; Jae Sung Lee
- Web page: https://patentgrep.com/patent/US9434620B2

## CPC

- C01B 32/182: Graphene
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 32/198: Graphene oxide
- C01B 2204/22: Electronic properties
- Y10T 428/249967: Inorganic matrix in void-containing component
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The present invention relates to a foam-shaped graphene structure and, more particularly, to a method for producing a foam-shaped graphene structure by boiling, and to a foam-shaped graphene structure using same. Provided is a method for producing a foam-shaped graphene structure by boiling, which includes the steps of: preparing a base substrate (S1); placing the base substrate in a reduced graphene oxide (RGO) colloid solution (S2); applying a heat flux to the base substrate using an exothermic body so as to cause boiling (S3); and generating the foam-shaped graphene structure on the base substrate as bubbles generated by the boiling become overlapped (S4).

## Claims

### Claim 1

A method for producing a foam-shaped graphene structure by boiling, comprising the steps of:
preparing a base substrate (S1);
placing the base substrate in a reduced graphene oxide (RGO) colloid solution (S2);
applying a heat flux to the base substrate using an exothermic body so as to cause boiling (S3); and
generating a foam-shaped graphene structure on the base substrate as bubbles generated by the boiling overlap (S4).

### Claim 2 (depends on 1)

The method of claim 1, wherein the base substrate in Step S1 is at least one selected from the group consisting of silicone, a transparent conductive oxide (TCO) glass, a metal, a mother glass, and an elastic polymer.

### Claim 3 (depends on 1)

The method of claim 1, wherein the graphene oxide in Step S2 is reduced by hydrazine.

### Claim 4 (depends on 1)

The method of claim 1, wherein the reduced graphene oxide is present at a content of 0.01 to 0.0001% wt in the colloid solution in Step S2.

### Claim 5 (depends on 1)

The method of claim 1, wherein the reduced graphene oxide is present at a content of 0.005% wt in the colloid solution in Step S2.

### Claim 6 (depends on 1)

the method of claim 1, wherein the base substrate itself serves as the exothermic body in step S3.

### Claim 7 (depends on 1)

The method of claim 1, wherein the heat flux in Step S3 is adjusted within a range of 100 kW/m2 to 1,500 kW/m2.