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Preparation method of carbon nanotube

A technology of carbon nanotubes and nanowire arrays, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high cost, difficult large-scale preparation, high equipment, etc., and achieve low reaction temperature , The preparation method is simple, the effect of easy purification and separation

Active Publication Date: 2015-10-07
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method has high requirements on equipment, high cost, and is difficult to prepare on a large scale.

Method used

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  • Preparation method of carbon nanotube

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preparation example Construction

[0028] A method for preparing carbon nanotubes, comprising the steps of:

[0029] A. The silicon wafer is subjected to single-groove electrochemical constant-current corrosion processing to obtain a porous silicon nanowire array;

[0030] B, cutting the porous silicon nanowire array obtained in step A into small pieces, placing it in a reaction vessel, and then adding hexafluoropropylene oxide to the reaction vessel;

[0031] C, heating reaction vessel, then insulation reaction;

[0032] D. After the insulation reaction is completed, reduce the temperature of the reaction vessel, pass the generated gas into the alkaline aqueous solution, then take out the porous silicon nanowire array, and ultrasonically separate it in ethanol or pure water, and finally dry it to obtain carbon nanotubes.

[0033] According to a preferred embodiment of the present invention, the silicon wafer described in step A is a single-sided polished silicon wafer, and the resistivity of the silicon wafer...

Embodiment 1

[0039] The single-sided polished silicon wafer with a resistivity of 3Ω·cm is subjected to single-slot electrochemical constant-current corrosion processing. The electrolyte is 40% hydrofluoric acid, 30% hydrogen peroxide and monohydric alcohol in a volume ratio of 1:2:2. mixed solution;

[0040] The porous silicon nanowire array obtained above was cut into small pieces with a size of 2*2cm, placed in a reaction vessel, and then 5000ml of hexafluoropropylene oxide was added to the reaction vessel;

[0041] Heating the reaction vessel so that the temperature in the reaction vessel is 150°C, and keeping it warm for 60 minutes;

[0042] The temperature of the reaction vessel was lowered to room temperature by natural cooling, the generated gas was passed into an alkaline aqueous solution for absorption, and then the porous silicon nanowire array was taken out, and ethanol was added for ultrasonic separation for 5 minutes, and finally dried to obtain carbon nanotubes.

Embodiment 2

[0044] The single-sided polished silicon wafer with a resistivity of 8Ω cm is subjected to single-slot electrochemical constant-current corrosion processing. The electrolyte is 40% hydrofluoric acid, 30% hydrogen peroxide and monohydric alcohol in a volume ratio of 1:2:2. mixed solution;

[0045] The porous silicon nanowire array obtained above was cut into small pieces with a size of 2*2cm, placed in a reaction vessel, and then 5000ml of hexafluoropropylene oxide was added to the reaction vessel;

[0046] Heat the reaction vessel so that the temperature in the reaction vessel is 180°C, and keep it warm for 30 minutes;

[0047] The temperature of the reaction vessel was lowered to room temperature by natural cooling, the generated gas was passed into an alkaline aqueous solution for absorption, and then the porous silicon nanowire array was taken out, and ethanol was added for ultrasonic separation for 10 minutes, and finally dried to obtain carbon nanotubes.

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Abstract

The invention discloses a preparation method of a carbon nanotube. A porous silicon nanowire array is adopted as the reactant and reaction template, in the reaction hexafluoropropylene oxide (HFPO) is heated to a high temperature (150DEG C-220DEG C) to decompose and generate difluorocarbene free radical (:CF), the difluorocarbene free radical and the porous silicon nanowire array are subjected to contact reaction to generate silicon fluoride gas and active carbon atoms, the active carbon atoms are further assembled to produce a carbon nanotube, at the end of the reaction, ultrasonic separation is carried out with ethanol or water so as to obtain the pure carbon nanotube. According to the invention, the difluorocarbene free radical reacts with the porous silicon nanowire array to prepare the carbon nanotube, the reaction product is easy to purify and separate, the preparation process needs no catalyst, the reaction temperature is low, and by controlling the chemical process, carbon nanotubes of different thicknesses can be prepared, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing carbon nanotubes by using difluorocarbene free radicals. Background technique [0002] Carbon nanotubes (CNTs) are known as the king of nanometers or super nanomaterials. Since the discovery of carbon nanotubes by Iijima in Japan in 1991, they have received extensive research and attention worldwide due to their superior mechanical properties, electrical properties, chemical properties and potential application prospects. Carbon nanotubes are graphite tubular crystals, which are seamless nanoscale tubes formed by single-layer or multi-layer graphite sheets curled around the center at a certain helical angle. Each level of nanotube is a carbon atom hybridized with three surrounding carbon atoms through sp2 A cylindrical surface composed of hexagonal planes composed of fully bonded carbon atoms. According to the number of layers...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00
Inventor 王军谯志强杨云涛杨光成吴鹏
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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