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Process for preparing boron nitride nano tube

A boron nitride nanotube and boron oxide technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of low yield and low purity of boron nitride nanotubes

Inactive Publication Date: 2006-10-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

They obtained boron nitride nanotubes with low purity and low yield due to heat treatment under flowing nitrogen

Method used

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  • Process for preparing boron nitride nano tube
  • Process for preparing boron nitride nano tube
  • Process for preparing boron nitride nano tube

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: be the boron powder that purity is 99.8% as raw material, feed the ammonia gas of flow in the vacuum tube furnace after ball milling for a certain period of time and heat, the flow velocity of ammonia gas is 100ml / min, the speed of heating up 10C ° / min . When the temperature reaches 1000°C, keep at constant temperature for another 6 hours. Wash the sample several times with dilute hydrochloric acid, distilled water and ethanol, and dry it in a vacuum oven to obtain a white powder, which is the prepared boron nitride nanotubes with bamboo structure.

Embodiment 2

[0022] Embodiment 2: With the boron powder that purity is 99.8% as raw material, feed the ammonia gas of flow in vacuum tube furnace after ball milling for a certain period of time and heat, the flow rate of ammonia gas is 100ml / min, the speed of heating up 10C ° / min . When the temperature reaches 1200°C, keep at constant temperature for another 6 hours. A white powder is obtained, which is the prepared boron nitride nanotubes mainly having a cylindrical structure and a small amount of bamboo structure.

Embodiment 3

[0024] A certain proportion of boron powder (purity 99.8%) and Fe 2 o 3 (Analytical pure) After ball milling, feed flowing ammonia in the vacuum tube furnace for heating, the flow rate of ammonia is 100ml / min, and the speed of heating is 6-10C° / min. When the temperature reaches 1300°C, keep at constant temperature for another 3 hours. Wash the sample several times with dilute hydrochloric acid, distilled water and ethanol, and dry it in a vacuum oven to obtain a white powder, which is the prepared boron nitride nanotube.

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Abstract

A new method for preparing boron nitride nanotubes involves inorganic nanomaterials. Boron oxide, boric acid and other boron-containing and non-toxic boron compounds are used as raw materials, first ball milled for a certain period of time, then heated to above 800°C under flowing ammonia or nitrogen, and kept for more than 0.5h. After cooling, take it out, wash the sample with dilute hydrochloric acid, distilled water and ethanol, and then dry it to obtain a white powder that is boron nitride nanotube. This method has simple process, mild conditions and easy mass production. The yield reaches more than 80%. The prepared boron nitride nanotubes are semiconductors, and can be used in nanoelectronic devices, nanostructure ceramic materials, hydrogen storage and coating layers for preventing oxidation, propellant additives and composite flame retardancy, and have good application prospects.

Description

technical field [0001] The invention is a new method for preparing boron nitride nanotubes with high purity and high yield, and relates to inorganic nanometer materials. Background technique [0002] Boron nitride nanotubes are a very special nanotubular material. It has stable insulation, high thermal and chemical stability, and special mechanical and electrical properties. In recent years, the field of one-dimensional nanomaterials has received great attention. Electronic structure calculations show that boron nitride nanotubes are a semiconductor material with a fixed energy band width (5.5ev). Unlike carbon nanotubes, the banding does not depend on tube diameter, chirality, or nanotube wall number. Therefore, boron nitride nanotubes simplify the complexity of the energy bands of one-dimensional nanotubes, making it possible to manufacture nanoscale semiconductor elements, and provide an attractive prospect for the research and application of one-dimensional nanostruct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064
Inventor 曹传宝籍凤秋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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