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Method for preparing helical structure carbon nanotubes

A carbon nanotube and helical structure technology is applied in the field of catalytic chemical vapor deposition to prepare fibrous nanocarbon materials, which can solve the problem of low purity and the like

Inactive Publication Date: 2012-10-24
CHENGDU ZHONGKE PURUI PURIFYING EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the analysis of public reports and patents related to this aspect, the existing technology for preparing helical carbon nanotubes mainly has the following two deficiencies: (1) helical carbon nanotubes are mainly obtained in the form of by-products, and the purity is not high. high

Method used

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  • Method for preparing helical structure carbon nanotubes
  • Method for preparing helical structure carbon nanotubes
  • Method for preparing helical structure carbon nanotubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 8.7g of analytically pure nickel nitrate, 8.5g of copper nitrate, 95g of aluminum nitrate, and 55g of citric acid, dissolve them in 200ml of deionized water, stir at 70-90°C for 2-4 hours, and bake in a muffle furnace at 500-600°C After 0.5 hour, take it out and soak it in 1-10% NaOH solution and stir for 2 hours, filter and wash until neutral, and dry it. Take 0.2g of the above-prepared catalyst powder and spread it evenly on the bottom of the quartz boat, and then place it in the middle of a horizontally placed quartz tube (φ45x1500mm), blow nitrogen at 100-400ml / min for about 20-30 minutes, and remove the air from the reaction device system , and at the same time, the temperature was programmed to rise by 10°C / min. When the temperature rose to 600°C, 300ml / min of acetylene was fed, and the reaction was carried out for 30 minutes. Stop heating and stop feeding acetylene. Cool to room temperature with nitrogen gas, and take out 2.5 g of the product. Characteriz...

Embodiment 2

[0021] Weigh 8.7g of analytically pure nickel nitrate, 32.5g of copper nitrate, 237g of aluminum nitrate, and 88g of citric acid, dissolve them in 350ml of deionized water, stir at 70-90°C for 2-4 hours, and bake in a muffle furnace at 500-600°C After 0.5 hour, take it out and soak it in 1-10% NaOH solution and stir for 2 hours, filter and wash until neutral, and dry it. Sprinkle 0.2g of catalyst powder evenly on the bottom of the quartz boat, and then place it in the middle of a horizontally placed quartz tube (φ45x1500mm), blow nitrogen at 100-400ml / min for about 20-30 minutes, and remove the air from the reaction device system. At the same time, program Raise the temperature by 10°C / min, when the temperature rises to 650°C, feed 200ml / min of acetylene, 100ml / min of hydrogen, and 100ml / min of nitrogen to react for 60 minutes. Stop heating and stop feeding acetylene. Cool to room temperature with nitrogen gas, and take out 3.5 g of the product. Characterized by SEM and TEM,...

Embodiment 3

[0023] Weigh 8.7g of analytically pure nickel nitrate, 25.7g of copper nitrate, 101.3g of aluminum nitrate, and 45.6g of citric acid, dissolve them in 200ml of deionized water, stir at 70-90°C for 2-4 hours, and place in a muffle furnace at 500-600 Roast at ℃ for 0.5 hours, take out, soak and stir in 1-10% NaOH solution for 2 hours, filter and wash until neutral, and dry. Sprinkle 0.2g of catalyst powder evenly on the bottom of the quartz boat, and then place it in the middle of a horizontally placed quartz tube (φ45x1500mm), blow nitrogen at 100-400ml / min for about 20-30 minutes, and remove the air from the reaction device system. At the same time, program Raise the temperature by 10°C / min, when the temperature rises to 700°C, feed 200ml / min of acetylene, 200ml / min of hydrogen, and 100ml / min of nitrogen to react for 60 minutes. Stop heating and stop feeding acetylene. Cool to room temperature with nitrogen gas, and take out 1.3 g of the product. Characterized by SEM and TEM...

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Abstract

The present invention discloses a method for preparing helical structure carbon nanotubes. According to the helical structure carbon nanotubes, a copper-nickel-aluminum composite oxide is adopted as a catalyst, acetylene is adopted as carbon source gas, a mixed gas of hydrogen and nitrogen is adopted as carrier gas, and the helical structure carbon nanotubes are prepared at a temperature of 500-800 DEG C by using a fixed bed catalytic chemical vapor deposition method. The prepared helical structure carbon nanotubes are twisted shape, and have characteristics of regular morphology, uniformity, tube diameter of 100-200 nm, length of 2-10 mum, and purity more than 80%, wherein the yield of the prepared helical structure carbon nanotubes can be 25 times the weight of the catalyst.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic materials, in particular to the preparation of fibrous nano-carbon materials by catalytic chemical vapor deposition. Background technique [0002] Since the discovery of carbon nanotubes by Japanese electron microscope expert Iijima in 1991, they have aroused people's strong interest for their unique structure, mechanical and photoelectric properties, and have been widely used in composite materials, hydrogen storage, electronic devices, batteries, supercapacitors, field emission There are large-scale applications or potential application prospects in the fields of displays, quantum wire templates, electron guns, sensors, and microscope probes. Helical carbon nanotubes are a special form of carbon nanotubes. Studies have found that this special form of carbon nanotubes has five-membered carbon rings and seven-membered carbon rings periodically distributed in its topological six-membered ring ...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y40/00C01B32/162
Inventor 周固民刘文平瞿美臻
Owner CHENGDU ZHONGKE PURUI PURIFYING EQUIP
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