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Method for preparing boron nitride nano-tube

A technology of boron nitride nanotubes and nitrogen gas, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of diverse structures and low purity of BN nanotubes, and achieve simple preparation process, mild reaction conditions, thickness uniform effect

Inactive Publication Date: 2009-08-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many methods for preparing BN nanotubes reported so far, the obtained BN nanotubes have various structures and low purity.

Method used

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  • Method for preparing boron nitride nano-tube
  • Method for preparing boron nitride nano-tube
  • Method for preparing boron nitride nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 7.05 grams of Ca(OH) 2 , 19.9 g B 2 o 3 , 23.15 grams of magnesium powder and 0.52 grams of Co 2 o 3 , put it into the reaction boat after mixing thoroughly, put it in a tube furnace, and react in an ammonia atmosphere at 950°C for 24 hours, keep the gas flux at 0.1L / min, cool down to 600°C with the furnace, and switch to argon to prevent BN oxidation. Add distilled water and 36wt.% hydrochloric acid to the product according to the reaction ratio, heat and stir at 50°C for 24 hours, dissolve impurities and metals in the product, filter with suction and wash several times, and dry in vacuum at 80°C for 24 hours to obtain 12.34 grams of white powder , with B 2 o 3 The yield was calculated as 87% based on the calculation. The product is analyzed by XRD, SEM, TEM, HRTEM and FTIR, which proves that the product is a relatively pure BN nanotube with a BN nanotube content of more than 85%. 90μm, diameter 17-21nm, average about 20nm, wall thickness 5-7nm, average 6n...

Embodiment 2

[0032] Take 7.58 grams of CaO, 28.28 grams of B 2 o 3 , 32.90 grams of magnesium powder and 0.85 grams of Co 2 o 3 , put it into the reaction boat after mixing thoroughly, put it in a tube furnace, and react in a nitrogen atmosphere at 600°C for 48 hours, keep the gas flux at 2.5L / min, cool down to 500°C with the furnace, and switch to argon to prevent BN oxidation. Add distilled water and 38wt.% hydrochloric acid to the product according to the reaction ratio, heat and stir at 80°C for 12 hours, dissolve impurities and metals in the product, filter with suction and wash several times, and vacuum dry at 80°C for 12 hours to obtain 17.73 grams of white powder , with B 2 o 3 The yield was calculated as 87.9% based on the calculation. The product is analyzed by XRD, SEM, TEM, HRTEM and FTIR, which proves that the product is a relatively pure BN nanotube with a BN nanotube content of more than 90%. ; Diameter 15-20nm, average about 22nm, wall thickness 5-10nm, average about...

Embodiment 3

[0034] Take 7.51 grams of Ca(OH) 2 , 36.10 g H 3 BO 3 , 23.51 grams of magnesium powder and 0.65 grams of Fe 2 o 3 , put it into the reaction boat after mixing thoroughly, put it in a tube furnace, and react in a nitrogen atmosphere at 1000°C for 48 hours, keep the gas flux at 5L / min, cool down to 600°C with the furnace, and switch to argon to prevent BN oxidation . Add distilled water and 38wt.% hydrochloric acid to the product according to the reaction ratio, heat and stir at 80°C for 12 hours, dissolve impurities and metals in the product, filter with suction and wash several times, and dry in vacuum at 80°C for 12 hours to obtain 12.41 grams of white powder , with H 3 BO 3 The yield was calculated as 82.7% as a benchmark. The product is analyzed by XRD, SEM, TEM, HRTEM and FTIR, which proves that the product is a relatively pure BN nanotube with a BN nanotube content of over 90%. ; Diameter 15-20nm, average about 22nm, wall thickness 5-10nm, average about 7nm, unif...

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Abstract

The invention relates to a method for preparing boron nitride nano-tube. Boron-source catalyst precursor reacts in nitrogen, ammonia gas or mixed gas of ammonia gas and hydrogen, and crude products are separated and purified; the boron-source catalyst precursor is formed by the mixture of boron-containing compound, magnesium powder, alkaline-earth metal compound and transition-metal catalyst; the element mol ratio of B: Mg: M1: M2 is 1: 1.65-1.70: 0.165- 0.182: 0.01- 0.06, wherein, the M1 is alkaline earth metal element in the alkaline-earth metal compound, and the M2 is transition-metal element in the transition-metal catalyst. The invention has the advantage that as the boron-source catalyst precursor is adopted, mild reaction condition can be realized, and the preparation process is simpler; the prepared boron nitride nano-tube has even thickness as well as more than 85% of yield coefficient and more than 80wt.% of purity of the boron nitride nano-tube compared with raw material boron element.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a method for preparing boron nitride nanotubes. Background technique [0002] Since the discovery of carbon nanotubes, based on the structural similarity between hexagonal boron nitride (BN) and graphite, theoretical calculations have shown that BN nanotubes are energetically stable with a nearly constant energy gap (approximately 5.5eV ), especially the energy gap does not change with the chirality and the number of tube layers [1-2] , this constant electrical property makes it more practical than carbon nanotubes. At the same time, BN nanotubes have more outstanding oxidation resistance than carbon nanotubes, and the oxidation resistance temperature is as high as nearly 1000 °C [3] , is considered to replace carbon nanotubes as templates for high-temperature oxidation resistance to prepare other new one-dimensional nanomaterials. In addition, BN nanotubes have low den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064
Inventor 谷云乐潘新叶王吉林
Owner WUHAN INSTITUTE OF TECHNOLOGY
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