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A kind of carbon nanotube thin film and preparation method thereof

A carbon nanotube film, carbon nanotube technology, applied in nanotechnology, chemical instruments and methods, carbon compounds, etc., can solve the problems of inability to maintain structural stability, low degree of axial orientation, etc., to improve electrochemical potential, structure Dimensional stability and good structural self-sustainability

Active Publication Date: 2020-12-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

In the aforementioned methods, the carbon nanotube film prepared by the dry method has a high degree of order and good capacitance characteristics, but it cannot maintain a stable structure in an aqueous solution and needs to be clamped and fixed by an external force; the electrophoretic deposition method, spray coating method and spin coating method , and carbon nanotube films prepared by vacuum filtration usually have a low degree of axial orientation, and the material structure is often dense, resulting in a small amount of equilibrium charge absorbed by the carbon nanotube film in the electrolyte.

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  • A kind of carbon nanotube thin film and preparation method thereof
  • A kind of carbon nanotube thin film and preparation method thereof
  • A kind of carbon nanotube thin film and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a kind of preparation method of carbon nanotube film, and this preparation method comprises the following steps:

[0029] In the first step, the non-array carbon nanotube material is grown on the silicon wafer by ion reactive etching method and water-assisted chemical vapor deposition method. Specifically, by controlling the reaction gas flow rate, growth time and other conditions, the power of ion reactive etching is 18W, the gas source is Ar, the growth temperature of water-assisted chemical vapor deposition method is 750°C, C 2 h 4 The flow rate is 100sccm, and the growth time is 20min; the prepared non-array carbon nanotube material is mainly composed of 3-walled (average tube diameter: 8.1nm) carbon nanotubes, the purity is as high as 99.98%, the length of the carbon nanotubes is greater than 800μm, and the density About 9.7mg / cm 3 .

[0030] Step 2, peeling the prepared non-array carbon nanotube material from the silicon wafe...

Embodiment 1

[0034] The preparation method of the carbon nanotube film provided by the first embodiment of the present invention mainly includes the following steps:

[0035] (1) The silicon wafer (5 cm in diameter) was ultrasonically cleaned in ethanol for 10 min to remove dust on the surface, and then blown to a dry state with nitrogen. After plating the catalyst film on the silicon wafer, the ion reactive etching method was used to reduce the density of the catalyst, and the non-array carbon nanotube material was grown in a tube furnace (750°C). The prepared non-array carbon nanotube material was mainly composed of 3 The wall (average tube diameter is 8.1nm) is composed of carbon nanotubes, the purity is as high as 99.98%, the length of carbon nanotubes is greater than 800μm, and the density is about 9.7mg / cm 3 .

[0036] (2) peeling off the non-array carbon nanotubes from the silicon wafer, and preparing a carbon nanotube film with a nano-groove structure through a mechanical stretchi...

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Abstract

The invention belongs to the related technical field of nano material preparation, and discloses a carbon nanotube film and a preparation method thereof. The preparation method of the carbon nanotubefilm comprises the following steps: firstly, providing a non-array carbon nanotube material; and secondly, performing mechanical drawing treatment on the non-array carbon nanotube material to obtain acarbon nanotube film having a nano-groove structure. The carbon nanotube film is prepared through the preparation method of the carbon nanotube film, and has a bulk density of 520 mg / cm<3> and an area density of 4.1 mg / cm<2>; the aggregation degree between carbon nanotubes is small, and the axial array degree is 0.3 to 0.68. The carbon nanotube film provided by the invention does not change in size in various aqueous electrolytes, and the mechanical tensile strength is as high as 700 kPa; a relatively large capacitance change can be generated under the action of external uniaxial pressure, and the capacitance performance is relatively high.

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 film and a preparation method thereof. Background technique [0002] In the field of nanomaterials, carbon nanotube films are due to their excellent electrical properties (conductivity up to 10 6 S / m), thermal (thermal conductivity up to 3000W / m K) and mechanical properties have a wide range of applications in Li-ion batteries, supercapacitors, electric and thermal brakes, flexible displays, tensile strain sensors, energy recovery, etc. At present, the preparation methods of carbon nanotube films mainly include dry method, electrophoretic deposition method, spray coating method, spin coating method and vacuum filtration method. The intertwined structure of carbon nanotubes can realize carbon nanotube drawing, and a transparent carbon nanotube film with a high degree of orientation (axial direction) is prepared. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/168B82Y40/00
CPCB82Y40/00C01B32/168
Inventor 徐鸣张蒙蒙邓泽明
Owner HUAZHONG UNIV OF SCI & TECH
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