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Preparation method of high-purity multi-wall carbon nano-tube

A technology of multi-walled carbon nanotubes and nitrogen atmosphere, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of high price, high toxicity of carbon source material benzene, etc., and achieve low cost, excellent preparation process and equipment Simple, easy-to-achieve effects

Inactive Publication Date: 2008-06-04
BEIJING JIAOTONG UNIV
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  • Description
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Problems solved by technology

The purpose is to solve the technical problems existing in methods such as adopting catalytic cracking method, catalytic chemical vapor deposition method and thermal decomposition organometallic compound method at present: (1) carbon raw material thiophene (C 4 h 4 S) and C 60 etc. are expensive; (II) the carbon source material benzene (C 6 h 6 ) is highly toxic; (III) requires a special preparation system and technical issues of production safety

Method used

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  • Preparation method of high-purity multi-wall carbon nano-tube

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Experimental program
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Embodiment 1

[0015] Step 1 Mix 1.5g of activated carbon with 3g of ferrocene and grind them evenly;

[0016] Step 2 spread the mixture obtained in step 1 in a quartz crucible, and put it into a constant temperature zone in a tubular heating furnace;

[0017] In step 3, under the protection of a nitrogen flow rate of 300ml / min, the furnace temperature was raised to 1000°C at a rate of 15°C / min, reacted at this temperature for 3 hours, and cooled to 25°C under the protection of a nitrogen atmosphere to obtain multi-walled carbon nano tube, the product yield was 0.7 g.

Embodiment 2

[0019] Step 1 and step 2 are identical with embodiment one;

[0020] In step 3, under the protection of a nitrogen flow rate of 100ml / min, the temperature is raised to 1000°C, reacted at this temperature for 3 hours, and cooled to 25°C under the protection of a nitrogen atmosphere, and the product obtained is multi-walled carbon nanotubes, and the product yield is 0.5g .

[0021] In an embodiment, the mixture obtained in step 1 can also be spread in a silicon carbide crucible or a corundum crucible.

[0022] Fig. 1 and Fig. 3 are respectively the typical transmission electron micrographs of the multi-walled carbon nanotubes prepared by the present invention in the first embodiment and the second embodiment; as can be seen from the figure, the prepared multi-walled carbon nanotubes have high purity and small tube diameter. Uniform, with an inner diameter of 15-25nm, an outer diameter of 40-60nm, and a length of hundreds of nanometers to microns. From Fig. 2 and Fig. 4, it is ...

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Abstract

The invention discloses a preparing method of high-purity multi-wall carbon nanometer pipe, which adopting activated carbon as raw material and ferrocenyl as catalyst under mild condition (1000deg.c, non-toxic and safe); adopting heat chemical gas-phase sedimenting method to synthesize the product; simplifying preparing course and equipment; setting inner diameter at 15-25nm and outer diameter at 40-60nm; making surface of multi-wall carbon nanometer pipe smooth.

Description

technical field [0001] The invention relates to a preparation method of carbon nanotubes. Background technique [0002] Carbon nanotubes have been discovered since Professor S.Iijima of NEC Corporation in Japan in 1991 (S.Iijima Nature 354 (1991) 56). Due to its unique mechanical, electrical, optical and magnetic properties, it has attracted widespread attention from scientists around the world, and people have conducted extensive and in-depth research on the synthesis, structure, performance and application of carbon nanotubes. So far, people have developed a variety of methods for synthesizing carbon nanotubes. Including arc method (S.IijimaNature 354(1991)56), laser ablation method (S.Iijima, et al., J.Phys.Chem.100(1996)5839), catalytic cracking method (B H Liu, et al. , Chem.Phys.Lett.358 (2002) 96), catalytic chemical vapor deposition (K Matsui, et al., J.Phys.Chem.B, 105 (2001) 5682) and thermal decomposition of organometallic compounds (H Kim, et al., Carbon, 43(2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02B82B3/00
Inventor 朱红林海燕
Owner BEIJING JIAOTONG UNIV
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