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Method for preparing boron nitride coating carbon nano-tube/nano-wire and boron nitride nano-tube

A boron nitride nanotube, boron nitride package technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems affecting the application of boron nitride nanotubes, metal pollution, low yield, etc., and achieve cost Low, high production efficiency, low reaction temperature effect

Active Publication Date: 2010-02-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of these methods require the use of metal catalysts, which are likely to cause metal pollution; some need to be carried out under high temperature or high pressure; some require expensive equipment and complicated operations, and the cost is high and the output is low; Application of boron nanotubes in scientific research and industrial production

Method used

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  • Method for preparing boron nitride coating carbon nano-tube/nano-wire and boron nitride nano-tube
  • Method for preparing boron nitride coating carbon nano-tube/nano-wire and boron nitride nano-tube
  • Method for preparing boron nitride coating carbon nano-tube/nano-wire and boron nitride nano-tube

Examples

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Effect test

Embodiment 1

[0022] Example 1: Coating boron nitride on the surface of carbon nanotubes or nanowires through the reaction of ammonium fluoroborate, and obtaining boron nitride nanotubes by oxidation: weigh 4.2g NH with a balance 4 BF 4 and 0.2g of carbon nanotubes or nanowires into a stainless steel reactor. After the reactor was sealed tightly, it was heated to 600°C in a heating furnace for 12 hours and then the heating was stopped, and the reactor was naturally cooled to room temperature in the furnace. The reaction product was washed with deionized water and filtered with suction to remove the residual reactant NH 4 BF 4 and reaction by-products until the filtrate is neutral, and the obtained product is dried at 60° C. for 8 hours to obtain boron nitride-coated carbon nanotubes or nanowires.

[0023] The boron nitride-coated carbon nanotubes or nanowires obtained above are heated to 750° C. in air for oxidation treatment to obtain boron nitride nanotubes.

[0024] figure 1 Shown i...

Embodiment 2

[0025] Example 2: Coating boron nitride on the surface of carbon nanotubes or nanowires through the reaction of ammonium fluoroborate, and obtaining boron nitride nanotubes by oxidation: Weigh 4.2g NH with a balance 4 BF 4 and 0.2g of carbon nanotubes or nanowires into a stainless steel reactor. After the reaction kettle is tightly sealed, it is heated to 500° C. in a heating furnace for 18 hours, and then the heating is stopped, and the reaction kettle is naturally cooled to room temperature in the furnace. The reaction product was washed with deionized water and filtered with suction to remove the residual reactant NH 4 BF 4 until the filtrate is neutral, the obtained product is dried at 60° C. for 5 hours to obtain boron nitride-coated carbon nanotubes or nanowires.

[0026] The boron nitride-coated carbon nanotubes or nanowires obtained above are heated to 800° C. in air for oxidation treatment to obtain boron nitride nanotubes.

[0027] image 3 Shown is the TEM topo...

Embodiment 3

[0028] Example 3: Coating boron nitride on the surface of carbon nanotubes or nanowires through the reaction between sodium borohydride and ammonium chloride, and obtaining boron nitride nanotubes by oxidation: Weigh 1.5g NaBH with a balance 4 , 2.2 g NH 4 Cl and 0.2g carbon nanotubes or nanowires are loaded into a stainless steel reactor. After the reaction kettle is tightly sealed, it is heated to 530° C. in a heating furnace for 16 hours and then the heating is stopped, and the reaction kettle is naturally cooled to room temperature in the furnace. The reaction product was washed with deionized water and suction filtered to remove the residual reactant NaBH 4 , NH 4 Cl and reaction by-product NaCl until the filtrate is neutral, the obtained product is dried at 70°C for 5 hours, and heat-treated at 800°C to obtain boron nitride-coated carbon nanotubes or nanowires.

[0029] The boron nitride-coated carbon nanotubes or nanowires obtained above are heated to 770° C. in air ...

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Abstract

The invention discloses a method for preparing boron nitride coated carbon nano tubes / nano wires and boron nitride nano tubes. The method takes metallic boron hydrides and fluorborates as a boron source and ammonium salts as a nitrogen source, and the metallic boron hydrides, fluorborates and ammonium salts are reacted at the temperature of 500 to 600 DEG C for 8 to 18 hours and then naturally cooled and washed and filtered by deionized water until the liltrate is neutralized, and grey black boron nitride coated carbon nano tubes / nano wires are obtained after the reaction products are dried; the obtained boron nitride coated carbon nano tubes / nano wires are heated in air to the temperature of 750 to 800 DEG C for the oxidation treatment, so that the grey boron nitride nano tubes are obtained. The method of the invention has the advantages of simple equipment in use, easy and convenient operation, low reaction temperature, easy treatment of reactants, stable process and high productionefficiency, and can be applied to the mass production of boron nitride coated carbon nano tubes / nano wires and boron nitride nano tubes.

Description

technical field [0001] The invention relates to a method for preparing boron nitride-coated carbon nanotubes or nanowires and boron nitride nanotubes, belonging to the technical field of preparation of inorganic non-metallic materials. Background technique [0002] Since the discovery of carbon nanotubes in 1991, they have received great attention due to their excellent mechanical properties and special electrical properties. Oxidation has greatly restricted its application, especially in the preparation of high-temperature resistant composite materials, because carbon nanotubes are prone to react with other substances at high temperatures, further limiting their application. [0003] Boron nitride has excellent chemical stability and good oxidation resistance. At the same time, the structure of boron nitride is very similar to carbon, and the two have good structural matching, so they can be easily coated on the surface of carbon nanotubes boron nitride and form a good com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C01B21/064
Inventor 毕见强白玉俊亓永新王伟礼庞林林朱慧灵
Owner SHANDONG UNIV
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