# US 7,078,007 B2 · Method for manufacturing carbon nanotubes

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,078,007 B2
- Document ID: US7078007B2
- Status: Granted
- Kind: B2
- Application number: 10/353,936
- Filed: 2003-01-30
- Published: 2003-07-31
- Granted: 2006-07-18
- Earliest claimed: 2002-01-30
- Assignees: Samsung Electronics Co., Ltd.
- Inventors: Se-gi Yu; Whi-kun Yi; Jeong-hee Lee; Yong-wan Jin; Tae-won Jeong
- Web page: https://patentgrep.com/patent/US7078007B2

## CPC

- C01B 32/162: characterised by catalysts
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- B82Y 40/00: Manufacture or treatment of nanostructures
- C01B 2202/02: Single-walled nanotubes
- C01B 2202/06: Multi-walled nanotubes
- Y10S 977/742: Carbon nanotubes, CNTs
- Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.]
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A carbon nanotube manufacturing method is provided. In the carbon nanotube manufacturing method, carbon nanoparticles are dispersed in a strong acid solution and heated at a predetermined temperature under reflux to form carbon nanotubes from the carbon nanoparticles. The carbon nanotubes can be simply produced on a mass-scale at low costs by using the strong acid solution.

## Claims

### Claim 1

A method for manufacturing carbon nanotubes, comprising:
dispersing carbon nanoparticles in a form other than a carbon nanotube in a strong acid solution; and
heating said strong acid solution at a predetermined temperature wherein said strong acid solution vaporizes and is returned under reflux with the dissociation of carbon atom bonds within said dispersed carbon nanoparticles and the agglomeration thereof to form and grow carbon nanotubes from said dispersed carbon nanoparticles.

### Claim 2 (depends on 1)

The method of claim 1 wherein said carbon nanoparticles in the form other than a carbon nanotube are formed by laser vaporization or arc discharging.

### Claim 3 (depends on 2)

The method of claim 2, wherein said strong acid solution is selected from the group consisting of a nitric acid solution, a sulfuric acid solution, and a phosphoric acid solution.

### Claim 4 (depends on 2)

The method of claim 2, wherein said strong acid solution has a concentration of about 30%.

### Claim 5 (depends on 1)

The method of claim 1, wherein said carbon nanoparticles in the form other than a carbon nanotube and in a concentration of about 1% are dispersed in a nitric acid solution.

### Claim 6 (depends on 1)

The method of claim 1, wherein said predetermined temperature at which said strong acid solution is heated is about 110–140° C.