Preparation method of cup-stack carbon nano-tube

A technology of carbon nanotubes and stacked cups, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of reducing material performance, weakening structural advantages, and destroying carbon tube structures, so as to reduce deposition, reduce residence time, The effect of improving purity

Inactive Publication Date: 2009-11-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stacked cup-shaped carbon nanotubes prepared by the existing method have a large length, and the surface is mostly covered with amorphous carbon, which limits the diffusion and effective adsorption of ions (or gases, catalysts, etc.) on the surface during application, and weakens the Its structural advantages greatly reduce the material performance
Although the ball milling method can realize the short cutting of carbon nanotubes, the structure of the resulting carbon nanotubes is severely damaged, thus limiting its wide application in the fields of electrode materials, energy storage materials, and catalyst supports.

Method used

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  • Preparation method of cup-stack carbon nano-tube
  • Preparation method of cup-stack carbon nano-tube
  • Preparation method of cup-stack carbon nano-tube

Examples

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Effect test

Embodiment 1

[0022] The hydrogen flow rate of the carrier gas is 2.6cm / s, weigh 5 grams of the mixture of ferrocene and sulfur powder (wherein the weight ratio of ferrocene and sulfur powder is 40:1), the volatilization temperature is 250°C, and the reaction zone temperature is 1100°C , the heating rate is 20°C / min, and the temperature is kept for 5 minutes, and the final product is black powder.

[0023] Observation under scanning and transmission electron microscope ( figure 1 and figure 2 ) shows that the product is carbon nanotubes with shorter length. High-resolution transmission electron microscope photos ( image 3 ) indicates that the product is cup-stacked carbon nanotubes.

[0024] In this embodiment, the specifications of the obtained short cup-stacked carbon nanotubes are: length 0.2-3.5 μm, outer diameter 60-100 nm, inner diameter 80-120 nm, purity 40-70 wt%.

Embodiment 2

[0026] The flow rate of the carrier gas argon is 2.6cm / s, weigh 5 grams of the mixture of ferrocene and sulfur powder, wherein the weight ratio of ferrocene and sulfur powder is 80:1, the volatilization temperature is 350°C, and the reaction zone temperature is 1100 °C, the heating rate is 30 °C / min, the flow rate of methane is 0.05 cm / s, and the heat preservation is 35 min, the final product is black powder.

[0027] Observation under an electron microscope shows that the product is cup-stacked carbon nanotubes; in this embodiment, the specifications of the short stacked cup-shaped carbon nanotubes obtained are: length 0.2-3.5 μm, outer diameter 60-100 nm, inner diameter 80-120 nm , the purity is 40-70wt%.

Embodiment 3

[0029] The flow rate of the carrier gas argon is 2.6cm / s, weigh 5 grams of the mixture of ferrocene and sulfur powder, wherein the weight ratio of ferrocene and sulfur powder is 20:1, the volatilization temperature is 450°C, and the flow rate of acetylene is 0.03cm / s, the temperature in the reaction zone is 900°C, the heating rate is 40°C / min, and the heat preservation is 75min. The final product is black powder.

[0030] Observation under an electron microscope shows that the product is cup-stacked carbon nanotubes; in this embodiment, the specifications of the short stacked cup-shaped carbon nanotubes obtained are: length 0.2-3.5 μm, outer diameter 60-100 nm, inner diameter 80-120 nm , the purity is 40-70wt%.

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Abstract

The invention relates to a preparation technique of carbon nano-tubes, in particular to a preparation method of a cup-stack carbon nano-tube, which is suitable to prepare a short cup-stack carbon nano-tube. The cup-stack carbon nano-tube can be produced by the following steps: an organic compound carbon source, catalyst, buffer gas and sulfur-containing growth promoter are adopted, an organic metal compound is used as both the carbon source and the catalyst precursor, and the organic compound catalyst is sublimated and is fully uniformly mixed with the carbon source and then is input into a reaction region, wherein the mol ratio of sulfur atoms and carbon atoms in the gas state compound of the reaction region is 1 / 10-1 / 500. The invention realizes the growth of the short cup-stack carbon nano-tube and reduces the formation of carbon impurities through decreasing the concentration of the carbon atoms in the reaction region.

Description

Technical field: [0001] The invention relates to a preparation technology of carbon nanotubes, in particular to a preparation method of cup-stacked carbon nanotubes, which is suitable for preparing short cup-stacked carbon nanotubes. Background technique: [0002] Since Japanese scientists discovered cup-stacked carbon nanotubes in 2002, due to its unique one-dimensional nanostructure and many excellent properties, it has been the frontier and hotspot of research in the fields of physical chemistry and materials at home and abroad. The traditional carbon nanotube structure can be regarded as a seamless hollow tubular structure formed by curling graphene, while stacked cup-shaped carbon nanotubes are different, which is formed by stacking a series of cone-shaped graphene layers with the top cut off. A one-dimensional carbon structure with a large inner cavity. The single graphene cup of stacked cup-shaped carbon nanotubes forms a certain angle (0-90°) with its axial directio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B1/00B82B3/00
Inventor 成会明刘庆丰任文才李峰丛洪涛
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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