Production method for thin film of aligned carbon nanotube

Patent metadata

Field	Value
Publication number	US-12486173-B2
Application number	US-202017629244-A
Country	US
Kind code	B2
Filing date	Jul 20, 2020
Priority date	Jul 24, 2019
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

The object of the present invention is to provide a production method and a production apparatus for a thin film of aligned carbon nanotubes. The present invention relates to a production method for an aligned carbon nanotube film having a film thickness of less than 1000 nm, including a step of causing a part of a dispersion solvent liquid of a carbon nanotube dispersion liquid to permeate to a lower surface side of a filter paper while causing the carbon nanotube dispersion liquid to flow in one direction on an upper surface of the filter paper, and a production apparatus that can be used for said method.

First claim

The invention claimed is:

1 . A production method for an aligned carbon nanotube film having a film thickness of less than 1000 nm, comprising:
installing a liquid flow adjusting plate having a groove extending in a flow direction of a carbon nanotube dispersion liquid to face an upper surface of a filter paper, and permeating a part of a dispersion solvent liquid of the carbon nanotube dispersion liquid to a lower surface side of the filter paper while flowing the carbon nanotube dispersion liquid in one direction along the groove in a flow path between the upper surface of the filter paper and the liquid flow adjusting plate, wherein the groove is a plurality of grooves extending in the flow path direction of the carbon nanotube dispersion liquid and parallel to each other, and, wherein an interval between each of the plurality of grooves is in the range of 0.01 mm and 2 mm.

2 . The production method according to claim 1 , wherein an interval between each of the plurality of grooves is in the range of 0.1 mm and 1 mm.

3 . The production method according to claim 1 , wherein one ends of at least some of carbon nanotubes in the carbon nanotube dispersion liquid are fixed in pores of a filter paper or in the vicinity of the pores by flow of the dispersion solvent liquid permeating to the lower surface side of the filter paper, and at the same time, the other ends of the carbon nanotubes are aligned in the flow direction of the carbon nanotube dispersion liquid flowing along the upper surface of the filter paper.

4 . The production method according to claim 1 , wherein the dispersion solvent liquid is caused to permeate to the lower surface side of the filter paper by sucking from the lower surface side of the filter paper.

5 . The production method according to claim 1 , wherein a dispersion liquid inflow port side of the liquid flow adjusting plate has a streamline shape.

6 . The production method according claim 1 , wherein the carbon nanotube dispersion liquid is supplied from a position higher than the upper surface of the filter paper or is supplied under pressure by using a liquid feeding pump.

7 . The production method according claim 1 , wherein the carbon nanotube dispersion liquid is sucked from a downstream side of the flow path.

8 . The production method according to claim 1 , further comprising a step of causing a solvent liquid for cleaning to flow through the flow path of the carbon nanotube dispersion liquid.

9 . The production method according claim 1 , further comprising a step of causing air or gas to low through the flow path of the carbon nanotube dispersion liquid to dry the aligned carbon nanotube film formed on the upper surface of the filter paper.

10 . A production method for an aligned carbon nanotube film having a film thickness of less than 1000 nm, comprising:
installing a liquid flow adjusting plate having a groove extending in a flow direction of a carbon nanotube dispersion liquid to face an upper surface of a filter paper, and permeating a part of a dispersion solvent liquid of the carbon nanotube dispersion liquid to a lower surface side of the filter paper while flowing the carbon nanotube dispersion liquid in one direction along the groove in a flow path between the upper surface of the filter paper and the liquid flow adjusting plate, wherein the groove is a plurality of grooves extending in the flow path direction of the carbon nanotube dispersion liquid and parallel to each other, and wherein each of the plurality of grooves is V-shaped, U-shaped, C-shaped, or angularly U-shaped.

11 . The production method according to claim 10 , wherein one ends of at least some of carbon nanotubes in the carbon nanotube dispersion liquid are fixed in pores of a filter paper or in the vicinity of the pores by flow of the dispersion solvent liquid permeating to the lower surface side of the filter paper, and at the same time, the other ends of the carbon nanotubes are aligned in the flow direction of the carbon nanotube dispersion liquid flowing along the upper surface of the filter paper.

12 . The production method according to claim 10 , wherein the dispersion solvent liquid is caused to permeate to the lower surface side of the filter paper by sucking from the lower surface side of the filter paper.

13 . The production method according to claim 10 , wherein a dispersion liquid inflow port side of the liquid flow adjusting plate has a streamline shape.

14 . The production method according claim 10 , wherein the carbon nanotube dispersion liquid is supplied from a position higher than the upper surface of the filter paper or is supplied under pressure by using a liquid feeding pump.

15 . The production method according claim 10 , wherein the carbon nanotube dispersion liquid is sucked from a downstream side of the flow path.

16 . The production method according to claim 10 , further comprising a step of causing a solvent liquid for cleaning to flow through the flow path of the carbon nanotube dispersion liquid.

17 . The production method according claim 10 , further comprising a step of causing air or gas to low through the flow path of the carbon nanotube dispersion liquid to dry the aligned carbon nanotube film formed on the upper surface of the filter paper.

18 . A production apparatus for an aligned carbon nanotube film having a film thickness of less than 1000 nm, comprising:
a flow path along an upper surface of a filter paper; a liquid flow adjusting plate having a groove extending in a flow direction of a carbon nanotube dispersion liquid and installed to face an upper surface of a filter paper; an inflow port of a carbon nanotube dispersion liquid to the flow path; an outflow port of the carbon nanotube dispersion liquid from the flow path; and a filtration dispersion solvent liquid discharge portion for discharging a dispersion solvent liquid that has permeated through the filter paper, wherein the groove is a plurality of grooves extending in the flow path direction of the carbon nanotube dispersion liquid and parallel to each other, and wherein an interval between each of the plurality of grooves is in the range of 0.01 mm and 2 mm.

19 . The production apparatus according to claim 18 , wherein an interval between each of the plurality of grooves is in the range of 0.1 mm and 1 mm.

20 . The production apparatus according to claim 18 , wherein each of the plurality of grooves is V-shaped, U-shaped, C-shaped, or angularly U-shaped.

Assignees

• Nec Corp
• Univ Meijo

Inventors

• Yuge Ryota
• Iijima Sumio

Classifications

• C01P2004/03

  obtained by SEM · CPC title

• C01B2202/20

  Nanotubes characterized by their properties · CPC title

• C01B2202/08

  Aligned nanotubes · CPC title

• C01B32/166 Primary

  in liquid phase · CPC title

• C01B32/172 Primary

  Sorting · CPC title