# US 12,767,538 B2 · Carbon nanotube assembly

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- Number: US 12,767,538 B2
- Document ID: US12767538B2
- Status: Granted
- Kind: B2
- Application number: 19/178,871
- Filed: 2025-04-15
- Published: 2025-07-31
- Granted: 2026-10-20
- Earliest claimed: 2020-02-28
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Akiyoshi Shibuya; Tomoko Yamagishi
- Web page: https://patentgrep.com/patent/US12767538B2

## CPC

- C01B 32/162: characterised by catalysts
- C01B 2202/08: Aligned nanotubes
- C01B 2202/34: Length
- C01P 2002/82: by IR- or Raman-data
- C01P 2002/90: Other crystal-structural characteristics not specified above
- C01P 2004/03: obtained by SEM
- C01P 2006/14: Pore volume
- C01P 2006/16: Pore diameter
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A carbon nanotube assembly satisfies at least one of the following conditions (1) to (3): (1) an FT-IR spectrum of a CNT dispersion obtained by dispersing the CNT assembly has a peak based on plasmon resonance of the CNTs in a wave number range of greater than 300 cm−1 and 2000 cm−1 or less; (2) the highest peak in a differential pore capacity distribution of the CNT assembly is located within a pore size range of more than 100 nm and less than 400 nm; and (3) a two-dimensional spatial frequency spectrum of an 10 electronic micrographic image of the CNT assembly has at least one peak within a range of 1 μm−1 or more and 100 μm−1 or less.

## Claims

### Claim 1

A carbon nanotube assembly, the carbon nanotube assembly satisfying at least one of the following conditions (1) to (3):
(1) a spectrum obtained by a Fourier transform infrared spectroscopic analysis on a carbon nanotube dispersion obtained by dispersing the carbon nanotube assembly so that a bundle length is 10 μm or more, has at least one peak based on plasmon resonance of the carbon nanotube dispersion in a wavenumber range of more than 300 cm−1 and 2000 cm−1 or less;
(2) a highest peak in a differential pore capacity distribution measured on the carbon nanotube assembly is located within a pore size range of more than 100 nm and less than 400 nm; and
(3) a two-dimensional spatial frequency spectrum of an electron microscopic image of the carbon nanotube assembly has at least one peak within a range of 1 μm−1 or more and 100 μm−1 or less.

### Claim 2 (depends on 1)

The carbon nanotube assembly according to claim 1, wherein the at least one peak based on plasmon resonance of the carbon nanotube dispersion is within a wave number range of 500 cm−1 or more.

### Claim 3 (depends on 1)

The carbon nanotube assembly according to claim 1, wherein the highest peak in the differential pore capacity distribution is 2 cm3/g or more.

### Claim 4 (depends on 1)

The carbon nanotube assembly according to claim 1, wherein at least two of the conditions (1) to (3) are satisfied.

### Claim 5 (depends on 1)

The carbon nanotube assembly according to claim 1, wherein all of the conditions (1) to (3) are satisfied.