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Method for improving graphitization degree of carbon nano tube

A technology of graphitization degree and carbon nanotubes, which is applied in the direction of chemical instruments and methods, carbon compounds, nanotechnology, etc., can solve the problems of carbon nanotube structure damage, slow heating rate, high energy consumption, etc., and achieve the optimization of carbon tube structure, Increased degree of graphitization and low energy consumption

Active Publication Date: 2014-07-23
NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these commonly used high-temperature treatment methods have the disadvantages of slow heating rate, high energy consumption, time-consuming, etc., and all require expensive special equipment. In addition, continuous and excessive heating will also damage the structure of carbon nanotubes, which is half the effort

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  • Method for improving graphitization degree of carbon nano tube
  • Method for improving graphitization degree of carbon nano tube

Examples

Experimental program
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Effect test

example 1

[0022] Such as figure 1 As shown, accurately weigh 2.698g (0.1mol) of nano-sized aluminum powder and 23.954g (0.15mol) of ferric oxide powder according to the molar ratio of 1:1.5, and mix them well to make thermite. Then commercially available CVD carbon nanotubes were placed in a graphite tube with an outer diameter of 6 mm, an inner diameter of 4 mm, and a length of 25 mm and compacted, then both ends of the graphite tube were sealed, and the surface of the graphite tube was coated with thermite. Using metal magnesium strips as the igniter, igniting the thermite, a violent thermite reaction occurs and a large amount of heat is released, which acts on the carbon nanotubes to rearrange the C-C bonds of the carbon tubes and optimize the structure. The processed carbon nanotubes are taken out from the graphite tube, and the degree of graphitization is detected by Raman spectroscopy, and the structural changes are analyzed.

example 2

[0024] Such as figure 2 As shown, accurately weigh 2.698g (0.1mol) of nano-scale aluminum powder and 19.163g (0.12mol) of ferric oxide powder according to the molar ratio of 1:1.2, and mix them well to make thermite. Then commercially available CVD carbon nanotubes were placed in a graphite tube with an outer diameter of 6 mm, an inner diameter of 4 mm, and a length of 25 mm and compacted, then both ends of the graphite tube were sealed, and the surface of the graphite tube was coated with thermite. Using metal magnesium strips as the igniter, igniting the thermite, a violent thermite reaction occurs and a large amount of heat is released, which acts on the carbon nanotubes to rearrange the C-C bonds of the carbon tubes and optimize the structure. The processed carbon nanotubes are taken out from the graphite tube, and the degree of graphitization is detected by Raman spectroscopy, and the structural changes are analyzed.

example 3

[0026] Accurately weigh 2.698g (0.1mol) of nanoscale aluminum powder and 15.969g (0.1mol) of ferric oxide powder according to the molar ratio of 1:1, and mix them well to make thermite. Then commercially available CVD carbon nanotubes were placed in a graphite tube with an outer diameter of 6 mm, an inner diameter of 4 mm, and a length of 25 mm and compacted, then both ends of the graphite tube were sealed, and the surface of the graphite tube was coated with thermite. Using metal magnesium strips as the igniter, igniting the thermite, a violent thermite reaction occurs and a large amount of heat is released, which acts on the carbon nanotubes to rearrange the C-C bonds of the carbon tubes and optimize the structure. The processed carbon nanotubes are taken out from the graphite tube, and the degree of graphitization is detected by Raman spectroscopy, and the structural changes are analyzed.

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Abstract

The invention discloses a method for improving graphitization degree of a carbon nano tube. The carbon nano tube is processed by using a lot of heat emitted by an aluminothermic reaction principle, so that the graphitization degree is improved, defects are reduced, and the carbon tube structure is optimized. The method is simple to operate, has the advantages of being quick to heat, low in energy consumption, short in period and the like, and is applicable to massive optimization of the carbon nano tube. The method comprises the following steps: fully and evenly mixing nanoscale aluminum powder with iron trioxide or ferroferric oxide powder according to a certain molar ratio, so as to form a thermit; enclosing the commercially available carbon nano tube into a graphite pipe to compress, sealing, and then coating the surface of the graphite pipe by using the thermit; igniting the thermit by taking a metal magnesium ribbon as an igniter, and thus carrying out violent response and releasing a lot of heat, so as to rearrange C-C bonds of the carbon nano tube; taking out the processed carbon nano tube from the graphite pipe, and analyzing the change condition of the graphitization degree by using the raman spectrum.

Description

technical field [0001] The invention relates to the technical field of nanomaterial technology, in particular to a method for effectively improving the graphitized structure of carbon nanotubes. Background technique [0002] As a nanomaterial, carbon nanotubes have a wide range of application prospects due to their unique structure and excellent properties, such as high-strength materials, conductive and thermal composite materials, nano-semiconductor devices, energy storage materials, and sensors. [0003] At present, industrial carbon nanotube products are mostly grown by chemical vapor deposition (Chemical Vapor Deposition: CVD). However, the growth temperature of the CVD method is low (usually 700-1000 ° C), so that the degree of graphitization of the grown carbon nanotubes is not enough, the disorder increases, and the structural defects increase, such as vacancies, dangling bonds, edges and dislocations, etc. (B.D.Andrews et al. Nano Lett., 2002, 2(6):615-619). The i...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y40/00C01B32/168C01B32/205
Inventor 赵江王伟张长春
Owner NANJING UNIV OF POSTS & TELECOMM INST AT NANJING CO LTD
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