Overlong carbon nanotubes and preparation method thereof

A technology of carbon nanotubes and hydrogen, which is applied in the field of carbon nanotubes and their preparation, ultra-long carbon nanotubes and their preparations, can solve problems such as gaps in electrical and mechanical properties, achieve perfect structure, high purity, and solve limited length Effect

Active Publication Date: 2011-04-06
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, although many research groups have also prepared ultra-long carbon nanotubes with a length of centimeters, their electrical and mechanical properties are still far from the theoretical values.

Method used

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  • Overlong carbon nanotubes and preparation method thereof
  • Overlong carbon nanotubes and preparation method thereof
  • Overlong carbon nanotubes and preparation method thereof

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preparation example Construction

[0034] figure 1 It is a simple schematic flow diagram of the preparation method of the present invention: the ethanol solution or aqueous solution of at least one metal chloride in Fe, Mo, Cu, Cr is used as a catalyst solution, applied on the substrate, under the protection of hydrogen or hydrogen and an inert gas The reduction of the catalyst is carried out under the condition of the catalyst, and then the carbon source gas is passed through to carry out the reaction. Superlong carbon nanotubes with perfect structure can be prepared after 30 seconds to 5 hours.

[0035] figure 2 It is a schematic diagram of the process device of Embodiment 1-3 of the present invention, and each label in the figure is as follows: 1 quartz tube, 2 catalyst, 3 substrate, 4 electric heating furnace, 5 Ar bottle, 6 methane gas bottle, 7 hydrogen gas bottle.

Embodiment 1

[0036] Embodiment 1, the preparation of ultra-long carbon nanotube

[0037] (1) FeCl with a concentration of 0.0001mol / L 3 The ethanol solution is applied on the substrate of the silicon wafer. The specifications of the silicon wafer are: the doping type is p-type, the crystal form is (111) type, and the resistivity is 10Ω·cm; the width is 1cm, the length is 10cm, and the surface has a thickness of 500nm. SiO 2 Oxide layer, SiO 2 The presence of the oxide layer can prevent Fe particles from reacting with the silicon wafer. Then coated with FeCl 3 The silicon wafer substrate of the ethanol solution is sent into the quartz tube reactor, such as figure 2 As shown, the inner diameter of the quartz tube is 31mm and the length is 1.5m.

[0038] (2) In the quartz tube reactor, feed the mixed gas of hydrogen and argon and heat the quartz tube reactor, control the flow rate of hydrogen to be 100ml / min, and the flow rate of argon to be 200ml / min; when the temperature rises to 900°...

Embodiment 2

[0042] Embodiment 2, preparation of ultra-long carbon nanotubes

[0043] (1) FeCl with a concentration of 0.04mol / L 3 and MoCl 3 The mixed ethanol solution (molar ratio: 1:1) was applied on the quartz substrate, and the quartz sheet was a curved sheet with a diameter of 5 cm and a length of 10 cm. The quartz substrate coated with the mixed ethanol solution is then fed into a quartz tube reactor as figure 2 As shown, the inner diameter of the quartz tube is 20mm and the length is 1.0m.

[0044] (2) In the quartz tube reactor, feed the mixed gas of hydrogen and argon and heat the quartz tube reactor, control the flow rate of hydrogen to be 200ml / min, and the flow rate of argon to be 100ml / min; when the temperature rises to 800°C , the reduction reaction was carried out at constant temperature for 25 minutes, and Fe particles and Mo particles with a particle size of nanometer were obtained, which had high catalytic activity.

[0045] (3) After the reduction reaction is over,...

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Abstract

The invention provides overlong carbon nanotubes and a preparation method thereof. The method provided by the invention comprises the following steps of: 1) coating ethanol solution or aqueous solution of a metal chloride of at least one of Fe, Mo, Cu and Cr on a substrate, placing the substrate in a reactor and heating the reactor to 600 to 1,000 DEG C, introducing a hydrogen gas or mixed gas ofthe hydrogen gas and an inert gas into the reactor to perform reduction reaction; and 2) heating the reactor to 800 to 1,100 DEG C after the reduction reaction is finished, and introducing mixed gas of a carbon source gas, the hydrogen gas and vapor into the reactor and reacting to obtain the carbon nanotubes. The overlong carbon nanotubes prepared by the method have perfect structures and superior electric and mechanical properties.

Description

technical field [0001] The invention relates to a carbon nanotube and a preparation method thereof, in particular to an ultra-long carbon nanotube and a preparation method thereof, and belongs to the technical field of nanomaterials and their preparation. Background technique [0002] Since the discovery of carbon nanotubes, due to their unique physical and chemical properties, carbon nanotubes have become super-strong and super-tough materials in nanomaterials. Theoretically, carbon nanotubes should be a material with a very perfect structure. They are all tubular structures composed of six-membered rings of carbon atoms. There are no topological defects such as five- and seven-membered rings or other structural defects, and they can It embodies very excellent electrical and mechanical properties, such as very high carrier mobility, very high conductivity and high switching ratio as a field effect transistor, Young's modulus as high as 1-2TPa, and tensile strength as high a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B31/00B82Y40/00
Inventor 魏飞张如范温倩骞伟中
Owner TSINGHUA UNIV
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