Preparation of tube wall layer number-controllable nano-carbon tube

A carbon nanotube and tube wall technology is applied in the field of preparation of carbon nanotubes, which can solve problems such as unfavorable research on the characteristics of multi-walled carbon nanotubes, and achieve the effects of simple operation, simple equipment, and cheap and easy-to-obtain raw materials.

Inactive Publication Date: 2008-11-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to control the number of wall layers of multi-walled carbon nanotubes is still a difficult problem. Therefore, most of the multi-walled carbon nanotubes prepared at present are mixtures of carbon nanotubes with different wall layers, which is not conducive to the development of multi-walled carbon nanotubes. The study of the properties, and the application of multi-walled carbon nanotubes for composite materials

Method used

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  • Preparation of tube wall layer number-controllable nano-carbon tube
  • Preparation of tube wall layer number-controllable nano-carbon tube
  • Preparation of tube wall layer number-controllable nano-carbon tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare double-walled carbon nanotubes, comprising the following steps:

[0025] (1) According to the molar ratio Fe:Mo:Al=1:0.1:13, take by weight polyethylene glycol-200 of iron nitrate nonahydrate, aluminum nitrate, ammonium molybdate tetrahydrate and the amount of substance equivalent to aluminum nitrate, dissolve Stir in deionized water until a transparent solution is formed, and control the molar concentration of aluminum nitrate to 0.1 mol / l. Then heat at 95°C to evaporate water to form a foamy colloid, then burn the foamy colloid violently at 550°C in air for 15 minutes, then cool and grind to make catalyst powder.

[0026] (2) heat-treat the quartz reaction chamber of the CVD device in air at 1000° C. for 30 minutes to remove residual carbon components, and then pass through 500 sccm of nitrogen to remove the air.

[0027] (3) Spread the prepared 0.100g catalyst powder evenly in the catalyst chamber, put it into a constant temperature quartz reaction chamber, ...

Embodiment 2

[0031] Prepare three-walled carbon nanotubes, comprising the following steps:

[0032] (1) Add 3.0g of magnesium ethylate to 200ml of deionized water, stir at 80°C for 30min, then add iron nitrate and ammonium molybdate according to the atomic ratio of Fe:Mo:Mg=1:0.5:7, and continue stirring for 1h , and then dissolve citric acid equivalent to half of the amount of magnesium element, and stir for 30 minutes to form a solution.

[0033] (2) Put the above mixed solution in a watch glass and place it on a partition, put the partition into a cold trap of a freeze dryer, cool down to -50° C., and freeze the above solution. After the solution is completely frozen, the separators are placed on the control panel of the drying room, and the vacuum degree of the drying room is evacuated to 10Pa, and then the sample is freeze-dried at -30°C for 24 hours to remove more than 90% of the water in the sample. Then slowly raise the temperature of the separator to -10°C, keep it warm for 2 hou...

Embodiment 3

[0038] Prepare four-walled carbon nanotubes, comprising the following steps:

[0039] (1) Add 3.0g of magnesium ethylate to 200ml of deionized water, stir at 80°C for 30min, then add iron nitrate nonahydrate and ammonium molybdate according to the atomic ratio of Fe:Mo:Mg=1.2:0.8:3, and continue Stir for 1 h, then dissolve ethylenediamine equivalent to 1 / 20 of the amount of magnesium element, and stir for 30 min to form a solution.

[0040] (2) Put the above mixed solution in a watch glass and place it on a partition, put the partition into a cold trap of a freeze dryer, cool down to -50° C., and freeze the above solution. After the solution is completely frozen, the separators are placed on the control panel of the drying room, and the vacuum degree of the drying room is evacuated to 10Pa, and then the sample is freeze-dried at -30°C for 24 hours to remove more than 90% of the water in the sample. Then slowly raise the temperature of the separator to -10°C, keep it warm for ...

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Abstract

The invention discloses a method for preparing a carbon nano-tube with controllable number of tube wall layers. The method comprises the following steps of: preparing transition metal salt, support salt and dispersant into sol or solution with de-ionized water after the transition metal salt, the support salt and the dispersant are mixed, and drying the sol or the solution with a sol-gel method or a freeze-drying method, thereby acquiring catalyst; putting the catalyst into a catalyst chamber which is sent into a thermostatic reactor of a CVD device and feeding carbon source gas in the protecting atmosphere to grow the carbon nano-tube. The method can control the diffusion velocity of carbon atoms in metallic nano-particles through changing the flow rate of the carbon source gas and the mol ratio of the transition metal salt to the support salt to the dispersant, thereby controlling the number of the tube wall layers of the carbon nano-tube. The method has a simple process, and prepares the carbon nano-tube with controllable number of the tube wall layers with high purity, thereby overcoming the defects that the prior prepared multi-wall carbon nano-tube is actually a carbon nano-tube mixture with uncertain number of tube wall layers, and providing a foundation for scientific research on various carbon nano-tubes with different numbers of the tube wall layers.

Description

technical field [0001] The invention relates to a preparation method of carbon nanotubes, in particular to a preparation method of carbon nanotubes with controllable tube wall layers. Background technique [0002] Since Japanese scientist Iijima discovered carbon nanotubes, a coaxial multilayer tubular, nano-sized, new carbon material with a complete molecular structure, in 1991, the special structure of carbon nanotubes makes them have excellent properties. For example, with the change of diameter and helicity, the conductivity of single-walled carbon nanotubes can be conductor, semiconductor and insulator; The thermal conductivity of multi-walled carbon nanotubes at room temperature is greater than 3000W / m K, which is much greater than that of diamond and graphite; the Young's modulus of carbon nanotubes is higher than that of graphite, almost the same as that of diamond, and its strength It is about 100 times that of steel, but its density is only 1 / 6 of that of steel. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C30B29/02C30B29/62C30B25/00
Inventor 杨杭生张孝彬董西慧祝文明赵崇斌牛强
Owner ZHEJIANG UNIV
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