High-oriented high-strength array drawn carbon nanotube film and preparation method thereof

A carbon nanotube film and oriented carbon nanotube technology, applied in the field of nanomaterials, can solve the problems of airflow disturbance, limited shrinkage of the film, etc., and achieve the effects of not easy bifurcation, reduced gap between tube bundles, and improved orientation

Active Publication Date: 2014-12-03
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current array film pulling method (see reference [2]: Liu W, Zhang X, Xu G, et al.Producing superior composites by winding carbon nanotubes onto a mandrel under a poly(vinyl alcohol)spray[J].Carbon, 2011,49(14):4786-4791.) What generally adopts is the on-line densification technology of coiling-spray spinning, and this technology uses airbrush after adhering the thin layer of carbon nanotubes on the roller The carbon nanotube film on the roll is sprayed with solvent from the end of the roll away from the array. This method has problems such as air flow disturbance and limited shrinkage of the film. Therefore, it is urgent to develop a more effective and controllable method to prepare highly oriented , high density, and better mechanical properties of carbon nanotube films

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  • High-oriented high-strength array drawn carbon nanotube film and preparation method thereof

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preparation example Construction

[0026] The present invention provides a highly oriented and high-strength array-stretched carbon nanotube film and a preparation method thereof. The preparation method specifically includes the following steps:

[0027] In the first step, spinnable carbon nanotube arrays are prepared.

[0028] The spinnable carbon nanotube array can be prepared by chemical vapor deposition. The carbon nanotubes are arranged in parallel to the substrate plane in the array. The length and wall number of the carbon nanotubes are determined by the growth conditions. Generally speaking, carbon nanotubes The tube length is 100 μm to 500 μm, and single-wall, few-wall (2 to 6 walls) and multi-wall (more than 6 walls) carbon nanotubes can be used.

[0029] The preparation of the spinnable carbon nanotube array by the chemical vapor deposition method comprises the following steps:

[0030] Electron beam evaporation technology is used to coat a layer of 0.4nm to 50nm aluminum layer, iron layer, cobalt l...

Embodiment 1

[0041] Adopt the method provided by the invention to prepare the carbon nanotube thin film of high orientation and high strength, concrete steps are as follows:

[0042] The first step is the growth of carbon nanotube arrays;

[0043] An aluminum layer with a thickness of 30nm and an iron layer with a thickness of 1nm were successively plated on a silicon substrate as a catalyst layer by electron beam evaporation technology. Then place the catalyst-coated silicon chip substrate in the quartz tube of the tube furnace, and at 750 ° C, under the protection of an inert gas (containing argon with a volume ratio of 6% nitrogen) to the tube at a speed of 1.5 L / min The carbon source ethylene was injected into the type furnace, and the carbon nanotubes were grown on the silicon substrate by chemical vapor deposition, and the spinnable carbon nanotube arrays with a height of 200 μm could be obtained after growing for 15 minutes.

[0044] The second step, the preparation of carbon nanot...

Embodiment 2

[0051] Adopt the method provided by the invention to prepare the carbon nanotube thin film of high orientation and high strength, concrete steps are as follows:

[0052] The first step is the growth of carbon nanotube arrays;

[0053] An aluminum layer with a thickness of 30nm and an iron layer with a thickness of 1nm were successively plated on a silicon substrate as a catalyst layer by electron beam evaporation technology. Then place the silicon chip substrate coated with the catalyst layer in the quartz tube of the tube furnace. The carbon source ethylene was injected into the type furnace, and the carbon nanotubes were grown on the silicon substrate by chemical vapor deposition, and the spinnable carbon nanotube arrays with a height of 200 μm could be obtained after growing for 15 minutes.

[0054] The second step, the preparation of carbon nanotube film;

[0055] Use a blade to pull out a thin layer of single-layer carbon nanotubes about 3 cm wide from the spinnable car...

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Abstract

The invention discloses a high-oriented high-strength array drawn carbon nanotube film and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a spinnable carbon nanotube array; then, winding the spinnable carbon nanotube array by using an array film-drawing method so as to obtain a dry-spun oriented carbon nanotube film, and improving the densification and orientation of the dry-spun oriented carbon nanotube film by using a method of solvent impregnating-drying by distillation; and finally, carrying out compaction treatment on the carbon nanotube film so as to obtain a high-oriented high-strength array drawn carbon nanotube film. The preparation method provided by the invention is simple in operation and strong in controllability; and the prepared high-oriented high-strength array drawn carbon nanotube film has a unique internal aggregation structure and excellent mechanical properties, and has great development potential and application value in the fields of structural materials, electronic devices, solar cells, and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a preparation method of a carbon nanotube film, in particular to a super-strength carbon nanotube film with high orientation and high density and a preparation method thereof. Background technique [0002] In 1991, Japanese electron microscope expert Iijima discovered a hollow tube made of carbon atoms with a diameter of several nanometers and a length of several micrometers, namely carbon nanotubes (CNTs), on the cathode carbon rod after argon DC arc discharge. Subsequently, researchers from all over the world made continuous achievements in the synthesis and application of carbon nanotubes, which greatly promoted the development of carbon nanotube materials and nanomaterials. Due to its unique hollow cage and closed topological structure, carbon nanotubes can withstand more than 40% of the strain and tension, and have extremely high strength, toughness and elastic mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00B82Y30/00
Inventor 李敏王艳洁李清文顾轶卓张永毅王绍凯张佐光
Owner BEIHANG UNIV
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