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Method for producing metallic carbon nanotube, carbon nanotube dispersion liquid, carbon nanotube-containing film, and transparent conductive film

A technology of carbon nanotubes and manufacturing methods, which is applied in the field of metallic carbon nanotubes, and can solve the problem that the conductive film of single-layer carbon nanotubes is not simple, etc.

Inactive Publication Date: 2014-05-14
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not simple to form a single-layer carbon nanotube conductive film by coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Single-walled carbon nanotubes were produced by the arc discharge method. A wet oxidation treatment (for example, 63% nitric acid at 85° C. for 2 days) was performed on the produced single-walled carbon nanotubes. Then, the single-walled carbon nanotubes are purified and recovered by filtration.

[0090] The bundle length of the purified single-walled carbon nanotubes was examined. As a result, it was judged that the mode value was in the range of 1.5 μm to 2.0 μm. In addition, the number of bundles of single-walled carbon nanotubes whose bundle length exceeds 1.5 μm accounted for about 73% of the whole. The number of bundles of single-walled carbon nanotubes with a bundle length of 1.5 μm or less accounted for about 27% of the whole. In addition, the ratio of 1.0 μm to 1.5 μm is about 13%, the ratio of 1.5 μm to 2.0 μm is about 20%, the ratio of 2.0 μm to 2.5 μm is about 18%, and the ratio of 2.5 μm to 3.0 μm is about 13%. That is, the number of bundles of single-w...

Embodiment 2

[0098] Commercially available metallic carbon nanotubes (IsoNanotubes-M: Metallic SWNTs manufactured by NanoIntegris Inc.) were centrifuged, and the taken out solids, hydroxyl-containing fullerenes, sodium hydroxide, water, and isopropanol were mixed, dispersion. Then, a centrifugation operation is performed. The supernatant was then bar coated onto a hardcoated polycarbonate substrate. Then, drying is performed. Thus, a polycarbonate plate with a transparent conductive film was obtained.

[0099] In addition, in this embodiment, metallic carbon nanotubes and semiconducting carbon nanotubes do not form tube bundles. Therefore, the ultrasonic treatment for unraveling the tube bundle performed in Example 1 was not performed.

[0100] The conductivity of the conductive film of the above-mentioned polycarbonate plate with transparent conductive film was examined. As a result, the conductivity was 1350 Ω / □, which was sufficient for practical use. In addition, the transparency...

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Abstract

A method for producing a metallic carbon nanotube, by which a dispersion with a high concentration can be obtained. Specifically disclosed is a method for producing a metallic carbon nanotube, which comprises a fullerene addition step wherein fullerenes are added into a carbon nanotube-containing solution in which metallic carbon nanotubes and semiconductive carbon nanotubes are mixed, and a taking-out step wherein carbon nanotubes dispersed by the added fullerenes are taken out.

Description

technical field [0001] The invention particularly relates to metallic carbon nanotubes. Background technique [0002] In recent years, as the market for thin display devices typified by liquid crystal displays has expanded, the need for transparent conductive films has increased dramatically. Transparent conductive films are used, for example, for electrodes. Alternatively, it is used for a resistive touch panel. Or, for electromagnetic wave shielding film. In addition, it can be used for various purposes. Such a transparent conductive film is generally composed of a metal oxide such as InSn oxide (ITO). A transparent conductive film such as ITO is formed by a method such as sputtering. Therefore, film formation by these methods requires high temperature. Therefore, the use of resin substrates poor in heat resistance is greatly restricted. In addition, film formation requires a vacuum atmosphere. Therefore, as the size of the substrate increases, a huge film-forming ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02H01B1/20H01B5/14H01B13/00
CPCH01B1/24B82Y30/00C01B31/0266C01B31/0273B82Y40/00C01B32/172C01B32/174
Inventor 北野高广
Owner KURARAY CO LTD
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