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Process for preparing nano-carbon tubes

A technology of carbon nanotubes and carbon nanotube arrays, applied in the direction of carbon nanotubes, oriented carbon nanotubes, nanocarbons, etc., can solve problems such as difficult dispersion, entanglement of carbon nanotubes, and inability to control the length of carbon nanotubes. To achieve the effect of controllable length and consistent length

Inactive Publication Date: 2006-12-20
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the length of carbon nanotubes cannot be controlled in the prior art, and the produced carbon nanotubes are entangled and difficult to disperse, the present invention provides a carbon nanotube with consistent production length, controllable length, no entanglement and easy dispersion. nanotube approach

Method used

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  • Process for preparing nano-carbon tubes
  • Process for preparing nano-carbon tubes
  • Process for preparing nano-carbon tubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Growth of carbon nanotube arrays with a length of 10 μm: a 5 nm thick iron catalyst film was deposited on a porous silicon substrate, then the iron-deposited substrate was annealed at 400 °C for 10 hours in air, and then the substrate was placed in a quartz reaction boat It was sent to the central reaction chamber of the quartz tube reaction furnace. Under the protection of argon, the reaction furnace was heated to 690 ° C, and ethylene gas was introduced to react for 15 seconds. Then the reaction furnace was cooled to room temperature to obtain a length of 10 μm. of carbon nanotube arrays.

Embodiment 2

[0035] Growth of carbon nanotube arrays with a length of 100 μm: a 5 nm-thick iron catalyst film was deposited on a porous silicon substrate, then the iron-deposited substrate was annealed at 400 °C for 10 hours in air, and then the substrate was placed in a quartz reaction boat It was sent to the central reaction chamber of the quartz tube reaction furnace. Under the protection of argon, the reaction furnace was heated to 690 ° C, ethylene gas was introduced, and the reaction was carried out for 5 minutes. Then the reaction furnace was cooled to room temperature to obtain a length of 100 μm. of carbon nanotube arrays.

Embodiment 3

[0037] Growth of carbon nanotube arrays with a length of 500 μm: a 5 nm-thick iron catalyst film was deposited on a porous silicon substrate, then the iron-deposited substrate was annealed at 400 °C for 10 hours in air, and then the substrate was placed in a quartz reaction boat It was sent to the central reaction chamber of the quartz tube reaction furnace. Under the protection of argon, the reaction furnace was heated to 710 ° C, and ethylene gas was introduced to react for 10 minutes, and then the reaction furnace was cooled to room temperature to obtain a length of 500 μm. of carbon nanotube arrays.

[0038] Experiments have confirmed that the density of carbon nanotube arrays can reach 0.1g / cm 3 . Based on the calculation of growing an array with a height of 100 μm, a reactor capable of placing 30 4-inch (25.4 mm) silicon wafer substrates (single-side catalyst) can produce about 2.4 grams of 100 μm long carbon nanotubes at one time, and the growth process takes time. Ab...

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Abstract

The invention provides a process for preparing carbon nano tube, which comprises the steps of, (1) providing a substrate, (2) depositing catalyst substrate on the substrate, (3) making the catalyst contact the carbon source gas at a predetermined temperature for a given period of time, thus making the carbon nano tube array of a specific length grow out substantially perpendicular to the substrate, (4) taking down the obtained carbon nano tube from the substrate. Compared with the prior art, the present invention realizes a uniform carbon nano tube preparation length, a controlled length and easiness for dispersion.

Description

【Technical field】 [0001] The present invention relates to a method for producing carbon nanotubes. 【Background technique】 [0002] Carbon nanotubes have strange physical and chemical properties, such as unique metal or semiconductor conductivity, extremely high mechanical strength, hydrogen storage capacity, adsorption capacity and strong microwave absorption capacity. And the material science community and the high-tech industry sector attach great importance. In order to realize industrial application of carbon nanotubes, the problem of low-cost mass production of carbon nanotubes must first be solved. Since the discovery of carbon nanotubes in 1991, the preparation process of carbon nanotubes has been extensively studied. At present, there are three main preparation methods, namely arc discharge method, laser ablation method and chemical vapor deposition method. In the products prepared by the arc discharge method and the laser ablation method, carbon nanotubes coexist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02D01F9/127
CPCB82Y30/00B82Y40/00C01B31/0226C01B31/0273C01B2202/08C01B2202/34D01F9/127D01F9/1271D01F9/1272D01F9/1275C01B32/16C01B32/174
Inventor 范守善刘亮姜开利
Owner TSINGHUA UNIV