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Preparation of boron nitride nano tube

A boron nitride nanotube, chemically pure technology, applied in the field of preparation of boron nitride nanotubes, can solve the problems of affecting promotion, high catalyst price, high cost, etc., and achieve the effect of low raw material price, easy control of reaction, and good contact

Inactive Publication Date: 2003-06-18
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the output and purity of these two methods are not high, the cost is high, and the process is complicated, which is not conducive to industrial production.
Recently, a synthesis method of carbon nanotube substitution reaction has been developed, in which the role of carbon nanotubes is to provide the framework for the growth of BN-NTs, and the obtained BN-NTs are similar in structure to C-NTs, but the BN prepared by this method -NTs are inevitably mixed with C-NTs, which affects the generalization of the method
BN-NTs can be synthesized by chemical vapor deposition (CVD) using a metal catalyst, but the previous CVD method requires additional reaction gas, and some catalysts used are expensive, which also limits its application to a certain extent.

Method used

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  • Preparation of boron nitride nano tube
  • Preparation of boron nitride nano tube

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Experimental program
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Embodiment

[0010] Weigh 0.602gCO(NH 2 ) 2 , 0.618gH 3 BO 3 , 0.404gFe(NO 3 ) 3 ·9H 2 O (molar ratio 1:3:0.1), dissolved together in 300ml of deionized water, and then heated in a vacuum drying oven with a constant temperature of 60°C for 6 hours to remove water to obtain a yellow-brown mixed powder. Then put the powder in a quartz boat and place it in the central hot zone of the quartz tube heated by a horizontal furnace. The openings at both ends of the quartz tube communicate with the atmosphere. Raise the temperature to 1000°C and keep for 60 minutes. The specific process is as follows: when the temperature exceeds 133°C, urea begins to melt and decompose to NH 3 , NH above about 700℃ 3 Can be combined with H 3 BO 3 The reaction produces BN. At the same time Fe(NO 3 ) 3 Decomposes to Fe at high temperature 2 O 3 And nitrogen oxides. NH 3 It is reductive and can reduce Fe. BN-NTs are grown under the catalysis of Fe nanoparticles.

[0011] The product is off-white powder, and X-ray diffract...

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Abstract

A process for preparing nanotubes of boron nitride (BN-NTs) includes such steps as dissolving H3BO3, CO(NH2)2 and Fe(NO3)3.9H2O or Co(NO3)2.6H2O, or Ni(NO3)2.6H2O) in deionized water, vacuum drying to obtain mixture powder, loading in open quartz tube, heating to 1000-1300 deg.C, holding the temp for 60-90 min, cooling, and immersing the powder in diluted nitric acid for removing catalyst. Its advantages are simple process and low cost.

Description

Technical field [0001] The invention relates to a method for preparing boron nitride nanotubes (BN-NTs). Background technique [0002] Since the discovery of carbon nanotubes (C-NTs), BN, BC, which also have a hexagonal structure, are used 3 And BC 2 Various methods for preparing nanotubes from N have also appeared one after another. Theoretical calculations show that the forbidden band width of BN-NTs has nothing to do with the diameter, helicity and the number of layers of the tube wall of the nanotubes. The specific electrical properties vary with structural factors such as the diameter, helicity of the nanotubes, and the number of layers of the tube wall. C-NTs have more advantages, and BN-NTs is a stable structure, which has unique application prospects in nano-devices. In addition, BN-NTs have better high temperature oxidation resistance than C-NTs, and are good thermal conductors and insulators. [0003] The first BN-NTs were synthesized by plasma ...

Claims

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Application Information

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IPC IPC(8): C01B35/14
Inventor 张弜李宗全徐进
Owner ZHEJIANG UNIV
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