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Method for making opening and short cutting on single wall Nano carbon tube

A carbon nanotube and short-cut technology, which is applied in the post-processing field of carbon nanotubes, can solve the problems of structural damage of single-walled carbon nanotubes, long time consumption and low yield.

Inactive Publication Date: 2007-10-10
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

However, this method has the following disadvantages: the degree of oxidation in an oxygen-containing atmosphere is not easy to control and takes a long time; although strong acid reflux water boiling can achieve the purpose of chopping and opening, but this process seriously damages the structure of single-walled carbon nanotubes , so that part of the single-walled carbon nanotubes into carbonaceous fragments, the yield is very low

Method used

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  • Method for making opening and short cutting on single wall Nano carbon tube
  • Method for making opening and short cutting on single wall Nano carbon tube

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Take 100 mg of single-walled carbon nanotubes with an average diameter of 1.85 nm after purification, mix them with 600 mg of KOH, and ball mill them on a planetary ball mill at a speed of 500 rpm for 2 h, and then grind them at 15 °C / min under the protection of argon. The heating rate was increased to 900°C for 2 hours, cooled naturally to room temperature, washed with HCl, rinsed with deionized water, and finally pure open and chopped single-walled carbon nanotubes were obtained. Observation by transmission electron microscope shows that the tube bundle length is between 2-3um, and the opening ratio of the sample is 85%.

Embodiment 2

[0019] Take 100 mg of single-walled carbon nanotubes with an average diameter of 1.85 nm after purification, mix them with 400 mg of KOH, and ball mill them on a planetary ball mill at a speed of 500 rpm for 2 h, and then grind them at 15 °C / min under the protection of argon. The heating rate was increased to 900°C for 2 hours, cooled naturally to room temperature, washed with HCl, rinsed with deionized water, and finally pure open and chopped single-walled carbon nanotubes were obtained. Observation by transmission electron microscope shows that the tube bundle length is between 2-3um, and the opening ratio of the sample is 80%.

Embodiment 3

[0021] Take 100 mg of single-walled carbon nanotubes with an average diameter of 1.85 nm after purification, mix them with 400 mg of KOH, and ball mill them on a planetary ball mill at a speed of 500 rpm for 2 h, and then grind them at 15 °C / min under the protection of argon. The heating rate was increased to 900°C for 2 hours, cooled naturally to room temperature, washed with HCl, rinsed with deionized water, and finally pure open and chopped single-walled carbon nanotubes were obtained. Observation by transmission electron microscope shows that the tube bundle length is between 2-3um, and the opening ratio of the sample is 80%.

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Abstract

This invention relates to a method for opening and cutting single-walled carbon nanotubs with a high efficiency. The method comprises: mixing single-walled carbon nanotubs and KOH at a ratio of 1 :( 4-7), ball-milling in a planetary ball mill under 500 rpm for 1-3 h, treating at 900 deg.C in Ar for 1-3 h, washing with HCl, and rinsing with deionized water to obtain purified, opened and cut single-walled carbon nanotubs. The method avoids strong acid refluxing and oxygen-containing atmosphere oxidation.

Description

Technical field: [0001] The invention relates to post-processing technology of carbon nanometer tubes, and in particular provides a method for opening and chopping single-wall carbon nanometer tubes. Background technique: [0002] At present, a large number of single-walled carbon nanotubes have been prepared for the study of their physical and chemical properties and practical applications. However, the single-walled carbon nanotubes usually prepared have a length of tens of microns or longer, and both ends are usually closed. When SWNTs are used for gas adsorption or catalyst support, the SWNTs are required to have a specific length and open ports to facilitate the entry and exit of particles. Therefore, the short cut and opening of SWNTs are of great significance for their practical application. [0003] Some scholars have proposed to short-cut single-walled carbon nanotubes by oxidation in an oxygen-containing atmosphere and boiled under strong acid reflux. However, t...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 成会明徐士涛刘畅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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