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A kind of carbon nanotube coil and its preparation method

A technology of carbon nanotube wires and carbon nanotubes, applied in the field of nanomaterial preparation, can solve the problem that carbon nanotube arrays cannot meet the requirements of high semiconductor selectivity and perfect structure, density and perfect structure cannot meet application conditions, and do not have semiconductor options To achieve the effect of tight connection, perfect structure and consistent chiral structure

Active Publication Date: 2018-03-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The longest ultra-long carbon nanotubes reported so far can reach 55 cm in length, and have perfect structure, isochirality and high semiconductor selectivity, but their density is only 2-3 CNTs / 100 μm, which seriously limits their large-scale applications. Applications in optoelectronic devices
Although great progress has been made in increasing the density of carbon nanotubes in recent years, such as the use of "Troy" catalysts to prepare carbon nanotube arrays with a density as high as 130CNTs / μm, and the use of graphene or SiO 2 Nanospheres reduce catalyst aggregation and increase the density of ultra-long carbon nanotube arrays, but none of the prepared carbon nanotube arrays can meet the requirements of high semiconductor selectivity and perfect structure.
On the other hand, by optimizing the catalyst design, the preparation of carbon nanotube arrays with a chirality of 92% (12,6) can be achieved, but they do not have semiconductor selectivity, and cannot meet the application in terms of density and perfect structure. condition

Method used

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  • A kind of carbon nanotube coil and its preparation method
  • A kind of carbon nanotube coil and its preparation method
  • A kind of carbon nanotube coil and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Will press with 0.1mol / L FeCl 3 The silicon substrate of the ethanol solution of the catalyst is placed in a substrate or a quartz boat and placed in a furnace reactor;

[0036] 2) Pass 200sccm of argon and hydrogen mixed inert gas (Ar:H2=1:2, v / v) into the reactor as a protective gas, and start to heat up, when the temperature rises to 900-1010°C, Constant temperature 20min. Then enter the reaction stage, pass into 180sccm methane and hydrogen mixed reaction gas (H 2 :CH 4 =2:1, v / v), start the ultra-long carbon nanotube preparation reaction, the reaction time is 10min-2h, the obtained single ultra-long carbon nanotube sample scanning electron microscope characterization result is as follows figure 1 As shown, the Rayleigh characterization map is as figure 2 As shown, the length standard is marked in the lower right corner of the picture. The diameter of carbon nanotubes tested is 0.6-5nm, and the length is 1mm-5m;

[0037] 3) At the later stage of the reactio...

Embodiment 2

[0040] 1) Will press with 0.1mol / L FeCl 3 The silicon substrate of the ethanol solution of the catalyst is placed in a substrate or a quartz boat and placed in a furnace reactor;

[0041] 2) Pass 200sccm of argon and hydrogen mixed inert gas (Ar:H2=1:2, v / v) into the reactor as a protective gas, and start to heat up, when the temperature rises to 900-1010°C, Constant temperature 20min. Then enter the reaction stage, pass into 180sccm methane and hydrogen mixed reaction gas (H 2 :CH 4 =2:1, v / v), start the ultra-long carbon nanotube preparation reaction, the reaction time is 10min-2h, the obtained ultra-long carbon nanotube has a diameter of 0.7-4nm and a length of 1-5m after detection;

[0042] 3) At the later stage of the reaction, sound waves are added to the reactor, and the sound waves are formed by the electro-acoustic conversion device, which is constructed using the construction method in Example 1. The frequency of the electrical signal is controlled between 1-10kH...

Embodiment 3

[0045] 1) Will press with 0.1mol / L FeCl 3 The silicon substrate of the ethanol solution of the catalyst is placed in a substrate or a quartz boat and placed in a furnace reactor;

[0046] 2) Pass 200sccm of argon and hydrogen mixed inert gas (Ar:H2=1:2, v / v) into the reactor as a protective gas, and start to heat up. When the temperature rises to 1000°C, keep the temperature constant for 20min . Then enter the reaction stage, pass into 180sccm methane and hydrogen mixed reaction gas (H 2 :CH 4 =2:1, v / v), start the ultra-long carbon nanotube preparation reaction, the reaction time is 10min-2h, the obtained ultra-long carbon nanotube has a diameter of 5nm and a length of 5m after detection;

[0047] 3) At the later stage of the reaction, sound waves are added to the reactor, and the sound waves are formed by the electro-acoustic conversion device, which is constructed using the construction method in Example 1. The frequency of the electrical signal is controlled between 1-...

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Abstract

The invention provides a carbon nano tube clew.The carbon nano tube clew is formed by irregularly winding one or more carbon nano tubes, the diameter of the carbon nano tubes is 0.6-5 nm, the length of the carbon nano tubes is 1-5 mm, the tile area of the carbon nano tube clew is 0.001-10 mm<2>, and the density is 1-200 CNTS / micrometers.The preparing method includes the steps that a catalyst is loaded on a growth substrate and then placed in a reactor, mixed inert gas is introduced to reduce the catalyst, and then mixed reaction gas is introduced to prepare super-long carbon nano tubes in a heating mode; sound waves are added into the reactor, so that the super-long carbon nano tubes are bent and wound in vortexes induced by the sound waves; after bending and winding are conducted for 10-20 min, mixed inert gas is introduced, the sound wave transmission is stopped, temperature is lowered to below 400 DEG C, and a product is taken out to obtain the carbon nano tube clew.The carbon nano tube clew is high in density, large in area and uniform in chirality, and the application area of the carbon nano tubes is broadened.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a carbon nanotube coil and a preparation method thereof. Background technique [0002] Carbon nanotubes are special carbon nanomaterials with a high aspect ratio and hollow tubular structure. They can be regarded as two-dimensional graphene curled in a certain direction. Different rotation axis directions make the formed carbon nanotubes have different optical rotations. and chirality parameters. With its unique hollow tubular structure and excellent mechanical, thermal, electrical and optical properties, carbon nanotubes have made remarkable achievements in supercapacitors, lithium-sulfur batteries, thin-film transistors, rubber tires, etc. in recent years, and are expected to Replacing silicon ushered in the era of carbon-based integrated circuits, and finally realized the dream of manufacturing high-performance carbon nanotube computers. However, an importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/168C01B32/16B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01P2002/82C01P2004/03C01P2004/30C01P2004/64
Inventor 魏飞朱振兴谢欢欢
Owner TSINGHUA UNIV
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