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Preparation method of boron nitride-coated carbon nanotubes

A boron nitride package and carbon nanotube technology, applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve problems such as poor interface bonding, and achieve the effects of low cost, simple use of equipment and stable process

Inactive Publication Date: 2013-06-26
SUN YAT SEN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0007] Compared with the prior art, the present invention obtains carbon nanotubes with good dispersion through the pretreatment of carbon nanotubes, and ultrasonically disperses the mixed solution of carbon nanotubes, boron nitride and urea, effectively solving the problem of carbon nanotubes. The problem of uniform distribution of nanotubes in the inorganic solution and poor interface bonding, and finally the boron nitride-coated carbon nanotube composite powder material obtained by high-temperature sintering process, the whole process is simple, easy to operate, simple to use equipment, and low cost Low, easy to obtain and relatively cheap raw materials, good controllability of material structure, stable process, no need for metal catalysts, no pollution, high production efficiency, and conducive to large-scale production

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preparation example Construction

[0012] The present invention is a kind of preparation method of boron nitride coated carbon nanotube, comprising the following steps:

[0013] (1) For pretreatment of carbon nanotubes, the carbon nanotubes are refluxed with acid, washed with deionized water until neutral, and dried in vacuum for later use. Preferably, the pretreatment process of carbon nanotubes is: use concentrated HNO 3 or HNO 3 with H 2 SO 4 Mix and reflux for 8-24 hours at a temperature of 80-110°C, then filter, rinse with deionized water until neutral, and vacuum-dry at 80-100°C to finally obtain carbon nanotubes with -OH and -COOH on the surface, thereby Improve the dispersibility of carbon nanotubes in boric acid solution.

[0014] (2) Dissolving boric acid and urea in a solvent, ultrasonically dispersing the carbon nanotubes obtained in step (1) in the solution to prepare a boron nitride-coated carbon nanotube precursor solution, filtering, and drying in air to obtain a powder. Preferably, the sol...

Embodiment 1

[0019] Step 1: Pretreatment of carbon nanotubes. The diameter of carbon nanotubes is 10-15nm. Weigh 1g of carbon nanotubes, pour them into a 250ml round bottom flask, and use concentrated HNO 3 Reflux for 24 hours at 110°C, filter, wash with deionized water several times until neutral, and then vacuum dry at 100°C for 12 hours for later use.

[0020] Step 2: Take by weighing 0.608g boric acid (H 3 BO 3 ), 7.087g urea (NH 2 -CO-NH 2 ), first H 3 BO 3 Pour it into 10ml of ethanol to dissolve it completely, then pour urea into the ethanol solution of boric acid, weigh 0.1g of oxidized carbon nanotubes, pour it into the saturated solution, and ultrasonically disperse it for 3 hours. The purpose is to make urea, boric acid and carbon nanotubes are uniformly dispersed, so that they are completely impregnated, then stirred at room temperature for 10 hours, filtered, and dried in the air for high temperature treatment.

[0021] Step 3: put the composite powder obtained in step 2...

Embodiment 2

[0024] Step 1: Pretreatment of carbon nanotubes. The diameter of carbon nanotubes is 10-15nm. Weigh 1g of carbon nanotubes, pour them into a 250ml round bottom flask, and use concentrated HNO 3 Reflux for 24 hours at 110°C, filter, wash with deionized water several times until neutral, and then vacuum dry at 100°C for 12 hours for later use.

[0025] Step 2: Take 0.608g boric acid (H 3 BO 3 ), 4.724g urea (NH 2 -CO-NH 2 ), first H 3 BO 3 Pour it into 15ml of ethanol to dissolve it completely, then pour urea into the ethanol solution of boric acid, weigh 0.05g of oxidized carbon nanotubes, pour it into the saturated solution, and ultrasonically disperse it for 2 hours. and carbon nanotubes are uniformly dispersed, so that they are completely impregnated, then stirred at room temperature for 10 hours, filtered, and dried in the air for high temperature treatment.

[0026] Step 3: put the composite powder obtained in step 2 into the porcelain boat, 2 Boron nitride-coated c...

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Abstract

The invention discloses a preparation method of boron nitride-coated carbon nanotubes. According to the method, urea is taken as a nitrogen source, a certain quantity of the carbon nanotubes after pretreatment are dissolved in a solution of boric acid and the urea, a precursor solution of the boron nitride-coated carbon nanotubes is prepared, filtration is performed, then an obtained product is dried, and high-temperature sintering is performed to get composite powder of the boron nitride-coated carbon nanotubes. The preparation method disclosed by the invention has the advantages of simple equipment, simplicity and convenience in operation, stable process, good controllability of material structure, low cost and higher production efficiency, and is conductive to large-scale production.

Description

technical field [0001] The present invention relates to a carbon nanotube (Carbon nanotube CNT), and more specifically relates to a preparation method of a boron nitride (BN)-coated carbon nanotube, which belongs to the field of inorganic non-metallic materials. Background technique [0002] Carbon nanotubes (CNTs) have high strength, high electrical conductivity and thermal conductivity (about 3000W / (mK) due to their small diameter, large aspect ratio, unique curly graphite sheet structure and nanoscale. )), low thermal expansion coefficient and other excellent properties, showing extremely broad application prospects in the fields of mechanical enhancement, electromagnetic shielding, nano (micro) devices, and clean energy. Therefore, since it was discovered in 1991 (Sumio lijima. Helical Microtubles of Graphic Carbon. Nature, 1991, 354: 56-58), it has quickly become a research hotspot for material scientists. [0003] Boron nitride (BN) ceramics have excellent thermal and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B21/064B82Y30/00C01B32/168
Inventor 张艺严伟许家瑞刘四委池振国
Owner SUN YAT SEN UNIV
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