Vertically aligned multi-walled carbon nanotubes

• US 10,640,382 B2
• Filed: 08/21/2018
• Issued: 05/05/2020
• Est. Priority Date: 08/22/2017
• Status: Active Grant

• Current Assignee: NTherma Corporation
• Original Assignee: NTherma Corporation
• Inventors: Nguyen, Cattien V.
• Primary Examiner(s): Le, Hoa (Holly)
• Application Number:
  US16/107,182
• Publication Number:
  US 20190062163A1
• Time in Patent Office: 623 Days
• Field of Search: 977742, 977752
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C01B 2202/06 Multi-walled nanotubes
• CPC Class Codes: C01B 2202/08 Aligned nanotubes
• CPC Class Codes: C01B 2202/30 Purity
• CPC Class Codes: C01B 2202/34 Length
• CPC Class Codes: C01B 32/158 Carbon nanotubes
• CPC Class Codes: C01B 32/164 involving continuous processes
• CPC Class Codes: C01P 2002/82 by IR- or Raman-data
• CPC Class Codes: C01P 2002/88 by thermal analysis data, e.g. TGA, DTA, DSC
• CPC Class Codes: C01P 2006/80 Compositional purity

Abstract

Provided herein are methods and devices for production of carbon nanotubes (CNTs) which have high structural uniformity and low levels of impurities. The device includes, for example, a module for depositing catalyst on a substrate, a module for forming CNTs, a module for separating CNTs from the substrate, a module for collecting the CNTs and a module for continuously and sequentially advancing the substrate through the above modules. The method includes, for example, the steps of depositing catalyst on a moving substrate, forming carbon nanotubes on the substrate, separating carbon nanotubes from the substrate and collecting the carbon nanotubes from the surface, where the substrate moves sequentially through the depositing, forming, separating and collecting steps.

Claims

1. Multi-walled carbon nanotubes of uniform length and greater than 90% purity, wherein the nanotubes are vertically aligned and the Raman spectra has an I_d/I_g ratio of about 0.76.

2. The multi-walled carbon nanotubes of claim 1, wherein the uniform length is about 50 μ

M, about 100 μ

M, about 150 μ

M or about 200 μ

M.

3. The multi-walled carbon nanotubes of claim 1, wherein the purity is greater than 90%, 95%, 99%, 99.5% or 99.9%.

4. The multi-walled carbon nanotubes of claim 1, wherein the purity is greater than 95%, 99%, 99.5% or 99.9% and the uniform length is about 50 μ

M, about 100 μ

M, about 150 μ

M or about 200 μ

M.

5. The multi-walled carbon nanotubes of claim 1, wherein the uniform length is about 50 μ

M, about 100 μ

M, about 150 μ

M or about 200 μ

M.

6. The multi-walled carbon nanotubes of claim 1, wherein the purity is greater than 90%, 95%, 99%, 99.5% or 99.9%.

7. The multi-walled carbon nanotubes of claim 1, wherein the purity is greater than 95%, 99%, 99.5% or 99.9% and the uniform length is about 50 μ

M, about 100 μ

M, about 150 μ

M or about 200 μ

M.