Multi-walled carbon nanotube, multi-walled carbon nanotube aggregation, and method for producing the multiwalled carbon nanotube

Patent metadata

Field	Value
Publication number	US-11305997-B2
Application number	US-202016850737-A
Country	US
Kind code	B2
Filing date	Apr 16, 2020
Priority date	Apr 26, 2019
Publication date	Apr 19, 2022
Grant date	Apr 19, 2022

Abstract

Applicability to a composite material with high purity and high strength, and a material requiring high conductivity or high thermal conductivity is enhanced. The present invention relates to a multi-walled carbon nanotube having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially, wherein a diameter of an outermost wall based on observation of an image by a transmission electron microscope is 3 nm or more and 15 nm or less, and a length based on observation of an image of a scanning electron microscope is 1.0 mm or more, an aggregate of multi-walled carbon nanotubes and a method for preparing the multi-walled carbon nanotube.

First claim

What is claimed is:

1. A multi-walled carbon nanotube having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially,
wherein a diameter of an outermost wall is 3 nm or more and 15 nm or less, and a length is 1.0 mm or more, and
wherein a wave where an average period based on observation of an image by a scanning electron microscope is 0.5 μm or more and 2.0 μm or less is formed in a lengthwise direction.

2. The multi-walled carbon nanotube of claim 1 , wherein the diameter of the outermost wall is determined based on observation of an image by a transmission electron microscope, and the length is determined based on observation of an image of a scanning electron microscope.

3. A multi-walled carbon nanotube aggregate that is an aggregate of multi-walled carbon nanotubes each having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially,
wherein an average diameter of outermost walls is 6 nm or more and 12 nm or less, and an average length is 1.4 mm or more, and
wherein in a lengthwise direction of multi-walled carbon nanotubes in the multi-walled carbon nanotube aggregate, waves where average periods based on observation of an image by a scanning electron microscope are 0.5 μm or more and 2.0 μm or less are formed.

4. The multi-walled carbon nanotube aggregate of claim 3 , wherein a metal content is 250 ppm or less by weight.

5. The multi-walled carbon nanotube aggregate of claim 3 , wherein a metal content is 250 ppm or less by weight.

6. The multi-walled carbon nanotube of claim 3 , wherein the average diameter of the outermost walls is determined based on observation of an image by a transmission electron microscope, and the average length is determined based on observation of an image of a scanning electron microscope.

Assignees

• Tpr Co Ltd

Inventors

• Shimizu Toshiaki
• Teshima Shinpei
• Okamura Yasuhiko
• Kawaguchi Yusuke
• Otomo Kazuki
• Koguchi Yuta
• Suzuki Katsuhito
• Bando Yoshio

Classifications

• C01B32/162 Primary

  characterised by catalysts · CPC title

• C01B32/158 Primary

  Carbon nanotubes · CPC title

• C01P2004/133

  Multiwall nanotubes · CPC title

• C01B2202/30

  Purity · CPC title

• C01P2004/30

  extending in three dimensions · CPC title