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Preparation method of high-crystallinity double-walled carbon nano tube

A technology of double-wall carbon nanotubes and high crystallinity, which is applied in the field of preparation of high-crystallinity double-wall carbon nanotubes, can solve the problems of wide distribution of double-wall carbon nanotube diameters, inability to mass-produce, and insufficient crystallinity. Achieve the effects of small average diameter, high crystallinity and narrow pipe diameter distribution

Inactive Publication Date: 2012-05-23
SHANGHAI UNIV
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Problems solved by technology

(Sugai T et al. Nano Letters, 2003, 3(6): 769-773) prepared double-walled carbon nanotube samples with narrow diameter distribution by high-temperature pulsed arc method, but the yield was very low. cannot be mass produced
Wei Jinquan et al. (Wei et al.Journal of Physical Chemistry B, 2004, 108(26):8844-8847) prepared double-walled carbon nanotube samples by chemical vapor deposition, but due to the limitations of the chemical vapor deposition method itself , the crystallinity of carbon nanotubes prepared by this method is not high enough compared to that of carbon nanotubes prepared by arc method, and the diameter distribution of double-walled carbon nanotubes is very wide

Method used

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  • Preparation method of high-crystallinity double-walled carbon nano tube
  • Preparation method of high-crystallinity double-walled carbon nano tube
  • Preparation method of high-crystallinity double-walled carbon nano tube

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Embodiment Construction

[0018] Specific embodiments of the present invention are described below.

[0019] In this embodiment, the preparation process and steps of double-walled carbon nanotubes are as follows:

[0020] (1) Preparation of anode carbon electrode rod containing catalyst

[0021] Use graphitizable carbon powder as raw material, add 1% iron catalyst by mass percentage, and 0.5% sulfur auxiliary catalyst, then press into cylindrical or square rods, sinter in an oxygen-deficient atmosphere at 800-1200°C, and then Then sinter in an oxygen-deficient atmosphere at 1400-2000°C.

[0022] (2) Preparation of carbon nanotubes

[0023] Prepared by DC arc discharge method. The cathode is a high-purity graphite rod, the anode is a catalyst-containing carbon electrode rod, and the discharge atmosphere is hydrogen or a mixed gas of hydrogen and argon with a volume fraction of hydrogen of 50%-80%. The discharge current is 50 amps to 200 amps. When discharging, the distance between the anode and the...

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Abstract

The invention relates to a preparation method of a high-crystallinity double-walled carbon nano tube, belonging to the technical field of preparation processes of carbon nano tube materials. The preparation method is characterized in that the carbon nano tube is prepared by adopting an anodic carbon electrode bar containing an iron catalyst and realizing the arc discharge between a negative electrode and a positive electrode by using an arc discharging method under a discharging atmosphere of hydrogen or mixed gas of hydrogen and argon, and meanwhile, the double-walled carbon nano tube is purified under the high-temperature treatment of hydrogen and air so as to finally obtain the double-walled carbon nano tube with purity above 90 percent. The prepared double-walled carbon nano tube has the advantages of high crystallinity, narrow caliber distribution, small average diameter and high purity.

Description

technical field [0001] The invention relates to a method for preparing a highly crystalline double-walled carbon nanotube, which belongs to the technical field of carbon nanotube material preparation technology. Background technique [0002] Double-walled carbon nanotubes are a type of multi-walled carbon nanotubes, a type of transition from single-walled carbon nanotubes to multi-walled carbon nanotubes, and are the simplest multi-walled carbon nanotubes. At the same time, because the diameter of double-walled carbon nanotubes is close to that of single-walled carbon nanotubes, the electrical, optical, and mechanical properties of double-walled carbon nanotubes are also close to those of single-walled carbon nanotubes, and it also has the advantages of multi-walled carbon nanotubes. . For example: double-walled carbon nanotubes have similar durability and oxidation resistance as multi-walled carbon nanotubes, and can exhibit the same electrical, optical, mechanical and qua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 赵新洛盛雷梅郁黎明安康石磊
Owner SHANGHAI UNIV
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