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Purification of single wall carbon nanotube prepared by catalytic organism pyrolyzing process

A technology of carbon nanotubes and purification methods, which is applied in the field of carbon nanotubes and can solve problems such as destruction and removal of amorphous carbon

Inactive Publication Date: 2004-09-22
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

Due to defects in the wall of single-walled carbon nanotubes, five-membered rings at both ends, and amorphous carbon wrapped around them, these parts will react with oxygen in the air at lower temperatures to cause the formation of single-walled carbon nanotubes. Therefore, heating single-walled carbon nanotubes in air has a lower starting temperature for oxidation, which is equivalent to the starting oxidation temperature of amorphous carbon, so amorphous carbon cannot be removed by simple heating and oxidation.

Method used

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  • Purification of single wall carbon nanotube prepared by catalytic organism pyrolyzing process

Examples

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Embodiment 1

[0013] 200 mg of single-walled carbon nanotubes obtained by the method stated in the patent 97119825.X were soaked in benzene for 7 days, then the sample was washed with deionized water several times, and the sample was soaked in a beaker of hydrochloric acid solution with a weight concentration of 37%. Put it in an ultrasonic cleaner for 1 hour, then take out the beaker, and place it on a magnetic stirrer for continuous stirring for 10 hours. After filtering and washing, the samples were soaked in liquid nitrogen for 10 hours and then sonicated again for 1 hour. Finally, it was washed with deionized water and dried to obtain a 75mg purified sample. It was found that the purity of the sample was above 95% through TGA, EDS and Raman spectroscopic analysis.

Embodiment 2

[0019] 200 mg of single-walled carbon nanotubes obtained by the method stated in patent 97119825.X, soaked in benzene for one week, then washed the sample with deionized water several times, and soaked the sample in a beaker of hydrochloric acid solution with a weight concentration of 37% , placed in an ultrasonic cleaner for 1 hour, then the beaker was taken out and placed on a magnetic stirrer for continuous stirring for 10 hours. After filtering and washing, the samples were soaked in liquid nitrogen for 10 hours and then sonicated again for 1 hour. Finally, it was washed with deionized water, and after drying, 90 mg of purified samples were obtained. Using TEM observation, multi-walled carbon nanotubes and carbon nanofibers could be seen in some areas. The analysis found that the purity of single-walled carbon nanotubes in the sample was above 90%. .

Embodiment 3

[0021] Take 200 mg of single-walled carbon nanotubes prepared by the method of Patent No. 97119825.X, soak them in toluene for 7 days, and the rest of the steps are the same as in Example 1. Finally, 70 mg of purified samples were obtained with a purity of 94%.

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Abstract

The present invention relates to a nanometer carbon tube technology. In order to raise the purification efficiency of single-wall nanometer carbon tube and simplify the operation, the present invention provides a kind of organic matter catalyzing thermal decomposition method for purifying single-wall nanometer carbon tube. The method includes the following steps: soaking single-wall nanometer carbon tube with aromatic hydrocarbon until the color of the solvent exhibits no further change; soaking with hydrochloric acid solution of 10-37 % concentration until the color of the solution exhibits no further change; and cryogenic treatment through liquid nitrogen soaking for 1-12 hr.

Description

Technical field: [0001] The invention relates to nano-carbon tube technology, and in particular provides a method for purifying single-walled carbon nano-tubes prepared by catalytic pyrolysis of organic matter. Background technique: [0002] Since the preparation of carbon nanotubes is often accompanied by impurities such as amorphous carbon, nano-carbon particles, and catalyst particles, the existence of these impurities greatly affects the performance and application of carbon nanotubes. Purification studies. [0003] Single-wall carbon nanotubes have smaller radius, larger end curvature, poor oxidation resistance, and are prone to react with functional groups such as -OH, -COOH, thereby changing the surface state of single-wall carbon nanotubes. Due to defects in the wall of single-walled carbon nanotubes, five-membered rings at both ends, and amorphous carbon wrapped around them, these parts will react with oxygen in the air at lower temperatures to cause the formation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 成会明李峰白朔
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI