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A kind of carbon nanotube fiber and preparation method thereof

A carbon nanotube fiber, carbon nanotube technology, applied in the direction of fiber chemical characteristics, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of poor capacitance characteristics of carbon nanotube fibers, Fermat twist, etc., to reduce Effective surface area available, reduced inter-embedding, improved structural recoverability

Active Publication Date: 2021-02-26
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs in the prior art, the present invention provides a carbon nanotube fiber and its preparation method, the purpose of which is to stack the arrayed carbon nanotube film and the super-aligned carbon nanotube film array The body is subjected to Fermat torsion to obtain carbon nanotube fibers with a shell-core structure, which has a more suitable bulk density and fiber diameter, and does not undergo dimensional changes in various aqueous electrolytes, and the mechanical tensile strength does not degrade. Under the action of external torsion, a large capacitance change can be produced, thereby solving the technical problem of poor capacitance characteristics of carbon nanotube fibers prepared in the prior art

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  • A kind of carbon nanotube fiber and preparation method thereof
  • A kind of carbon nanotube fiber and preparation method thereof
  • A kind of carbon nanotube fiber and preparation method thereof

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preparation example Construction

[0031] The present invention also provides a kind of preparation method of carbon nanotube fiber, and this preparation method comprises the following steps (wherein steps 1, 2 and steps 3, 4 are in no particular order):

[0032] Step 1, using the physical vapor deposition method and the water-assisted chemical vapor deposition method to grow the carbon nanotube array material on the silicon wafer.

[0033] Wherein, the physical vapor deposition process is aimed at the catalyst. Preferably, a multi-target radio frequency reactive magnetron sputtering instrument is used to physically deposit a catalyst thin film system on a clean silicon wafer substrate, including: firstly coating the substrate by reactive magnetron sputtering Aluminum oxide film, and then iron film, by controlling the coating time to obtain a catalyst film system of appropriate thickness, wherein the coating time is less than 30s for aluminum oxide and 30s-60s for iron.

[0034] The water-assisted chemical vapo...

Embodiment 1

[0045] The preparation method of the carbon nanotube fiber provided by the first embodiment of the present invention mainly includes the following steps:

[0046] (1) Sonicate silicon wafers (10 cm in diameter) in ethanol for 20 minutes to remove dust on the surface, and then blow them to a dry state with nitrogen. After coating the catalyst film on the silicon wafer, place it in a tube furnace (750°C) to grow arrayed carbon nanotube materials. The prepared arrayed carbon nanotube materials are mainly composed of 2 walls (average tube diameter is 5.4nm) and 3 walls ( The average tube diameter is 7.3nm) composed of carbon nanotubes, the purity is as high as 99.5%, the length of the carbon nanotubes is greater than 700μm, and the density is 41.3mg / cm 3 .

[0047] (2) The arrayed carbon nanotube material is peeled off from the silicon wafer, and prepared into an arrayed carbon nanotube film by a mechanical rolling process. Among them, the bulk density of the array carbon nanotu...

Embodiment 2

[0057] The preparation method of the carbon nanotube fiber provided by the first embodiment of the present invention mainly includes the following steps:

[0058](1) Sonicate silicon wafers (10 cm in diameter) in ethanol for 20 minutes to remove dust on the surface, and then blow them to a dry state with nitrogen. After coating the catalyst film on the silicon wafer, place it in a tube furnace (750°C) to grow arrayed carbon nanotube materials. The prepared arrayed carbon nanotube materials are mainly composed of 2 walls (average tube diameter is 5.4nm) and 3 walls ( The average tube diameter is 7.3nm) composed of carbon nanotubes, the purity is as high as 99.5%, the length of the carbon nanotubes is greater than 700μm, and the density is 41.3mg / cm 3 .

[0059] (2) The arrayed carbon nanotube material is peeled off from the silicon wafer, and prepared into an arrayed carbon nanotube film by a mechanical rolling process. Among them, the bulk density of the array carbon nanotub...

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Abstract

The invention belongs to the technical field related to the preparation of nanometer materials, and discloses a carbon nanotube fiber and a preparation method thereof. The preparation method of the carbon nanotube fiber includes the following steps: forming an array carbon nanotube material by rolling into a film to obtain an array Carbon nanotube film, dry stretch film of super-aligned carbon nanotube material to obtain super-aligned carbon nanotube array film; then, use the arrayed carbon nanotube film as the inner core material, and the super-aligned carbon nanotube array film as the shell Layer materials, two kinds of film materials are stacked and then subjected to Fermat twist to obtain carbon nanotube fibers with a shell-core structure. The carbon nanotube fiber obtained according to the above preparation method does not change in size in various aqueous electrolytes, and its mechanical tensile strength is as high as 20-30MPa. Under the action of external torsion, it can produce a large capacitance change and can be used as a working electrode. Used in the field of energy recovery.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of nanomaterials, and more specifically, relates to a carbon nanotube fiber and a preparation method thereof. Background technique [0002] In the field of nanomaterials, carbon nanotube fibers have been widely used in lithium-ion batteries, supercapacitors, electric and thermal brakes, tensile strain sensors, energy recovery and other fields due to their excellent electrical, thermal and mechanical properties. At present, the preparation methods of carbon nanotube fibers mainly include wet spinning method, floating catalytic spinning method and array spinning method. Among them, wet spinning prepares carbon nanotube fibers by dispersing single-arm carbon nanotubes into spinning solution, but the special chemical inertness and intertube interaction of carbon nanotubes make it easy to form tube bundles or entanglement during dispersion; The floating catalytic spinning method first ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12C23C14/08C23C14/16C23C16/26C23C16/44C23C16/56C23C14/35
CPCC23C14/0036C23C14/081C23C14/165C23C16/26C23C16/44C23C16/56D01F9/12Y02P70/62
Inventor 徐鸣邓泽明
Owner HUAZHONG UNIV OF SCI & TECH
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