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Method for producing carbon nanotube assembly having high specific surface area

A technology of carbon nanotubes and manufacturing methods, which is applied in the field of single-layer CNT aggregates, can solve problems such as not being obtained, and achieve the effects of suppressing the generation of carbon impurities, reducing waste, and low weight density

Inactive Publication Date: 2012-05-16
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there was no single-layer CNT aggregate whose height was significantly increased several hundred times from the conventional height of up to 4 μm (in Non-Patent Document 1, when the height was 2.5 mm, the improvement was 625 times from 4 μm).

Method used

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  • Method for producing carbon nanotube assembly having high specific surface area
  • Method for producing carbon nanotube assembly having high specific surface area
  • Method for producing carbon nanotube assembly having high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0195] use as figure 1 The shown CNT production apparatus produces CNT aggregates by the same method as the CNT production method described in the best mode. refer to figure 1 Be explained.

[0196] As the vertical synthesis furnace 3, a quartz tube such as a cylinder (inner diameter: 80 mm) is used. The length of the heating mechanism 6 and the heating area 7 is 260 mm.

[0197] A substrate holder 8 made of quartz was provided 50 mm downstream from the horizontal position of the central portion of the heating zone 7 . The substrate rack 8 is provided in the horizontal direction, and can place a planar substrate 1 thereon.

[0198] On the upper wall of the synthesis furnace 3, a gas supply pipe 4 made of a heat-resistant alloy with a diameter of 22 mm (inner diameter 20 mm) inserted into the opening provided at the center of the upper wall of the synthesis furnace 3 along the vertical direction is set. In addition, on the lower wall An exhaust pipe 5 inserted into an open...

Embodiment 2

[0232] (There is no carbon impurity adhesion suppression process)

[0233] Using the same manufacturing apparatus, substrate, and catalyst as in Example 1, and using the same manufacturing method as in Example 1, without performing the carbon impurity attachment suppression step, the CNT aggregate was synthesized and immediately removed from the heating zone 7. CNT aggregates are able to grow and have a specific surface area of ​​about 900 m 2 / g.

[0234] Under these conditions, the production of CNT aggregates was carried out 50 times continuously. As a result, although the yield did not change, the specific surface area gradually decreased when it was more than 20 times, and reached 800m2 when it was more than 30 times. 2 / g or less.

Embodiment 3

[0236] (without airflow forming mechanism)

[0237] In the manufacturing apparatus of Example 1, the source gas was blown onto the catalyst layer 2 on the substrate 1 from the gas supply pipe 4 disposed 20 mm above the substrate 1 without using the gas flow forming mechanism 9 . The growth of CNT aggregates was uneven between the central portion and the peripheral portion of the catalyst layer 2 on the substrate 1, and the synthesized CNT aggregates were also slightly uneven over the entire surface of the catalyst layer. The yield is 0.4mg / cm 2 , the specific surface area is about 1100m 2 / g. During continuous production, neither the yield nor the specific surface area changed.

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Abstract

Disclosed is a method for continuously and stably producing a CNT assembly having a high specific surface area in a high carbon concentration environment that contains a catalyst-activating substance. Specifically disclosed is a method for producing a CNT assembly having a high specific surface area, which comprises a formation step in which a catalyst on a base is reduced and / or microparticulated, and a growth step in which a starting material gas that contains carbon but does not contain oxygen and a catalyst-activating substance that contains oxygen are brought into contact with the catalyst and / or catalyst microparticles, while being heated, thereby growing carbon nanotubes. The ratio of the number concentration of carbon atoms contained in the starting material gas used in the growth step to the number concentration of oxygen atoms contained in the catalyst-activating substance used in the growth step is 0.5-200 (inclusive).

Description

technical field [0001] The present invention relates to an efficient production method of a single-layer CNT aggregate oriented continuously with a high specific surface area from a raw material containing a catalyst-activating substance in a high-carbon environment. Background technique [0002] Recently, the development of carbon nanotubes (hereinafter also referred to as CNTs) in functional new materials such as electronic device materials, optical element materials, conductive materials, and bio-related materials is expected, and efforts are being made to develop their applications. , quality, and mass production. [0003] As one of the methods for producing CNTs, a chemical vapor phase growth method (hereinafter also referred to as a CVD method) is known (see Patent Document 1 and the like). This method is characterized in that raw material gases such as carbon compounds are brought into contact with catalyst fine particles of the catalyst in a high-temperature atmosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J23/70
CPCC01B2202/32B01J23/745C01B31/0233B01J37/347B82Y40/00B01J37/16B01J23/74B82Y30/00C01B32/162
Inventor 畠贤治D·N·弗塔巴汤村守雄
Owner NAT INST OF ADVANCED IND SCI & TECH