A kind of preparation method of hexagonal boron nitride nanosheet

A hexagonal boron nitride and nanosheet technology, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve problems such as lowering synthesis temperature, and achieve the effects of improving crystallinity, reducing energy consumption, and uniform size distribution

Active Publication Date: 2016-03-30
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This synthesis method overcomes the problem that the existing method cannot synthesize boron nitride nanosheets with high quality and uniform size at a lower temperature, which reduces the synthesis temperature of hexagonal boron nitride nanosheets by about 1000 ° C. Nanosheet production offers low-cost process route

Method used

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  • A kind of preparation method of hexagonal boron nitride nanosheet
  • A kind of preparation method of hexagonal boron nitride nanosheet
  • A kind of preparation method of hexagonal boron nitride nanosheet

Examples

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Embodiment 1

[0025] (1) Mix 1 gram of boron nitride balls with a particle size of about 100 nanometers and 1 gram of sodium chloride, and then stir the mixture for 1 hour at a speed of 1000 revolutions per minute; wherein, boron nitride nanospheres are used by Tang Chengchun and others. Chemical vapor deposition method, boron nitride material with onion sheet structure prepared from methyl borate and ammonia (C.C.Tang, Y.Bando, Y.Huang, C.Y.Zhi, D.Golberg, Adv.Func.Mater .,2008,18,3653-3661.), its microstructure is as figure 1 shown.

[0026] (2) The powder obtained in the step (1) is heat-treated under a nitrogen atmosphere. The technical route is as follows: the heat treatment temperature is 700°C, the heating rate is 10°C per minute, the holding time is 2 hours, the gas flow rate is 100 ml / min, and the temperature is lowered to room temperature in a nitrogen atmosphere. After the samples were taken out, they were washed with deionized water to remove excess metal chlorides. Then dry ...

Embodiment 2、 example 3、 example 4

[0029] Change the consumption of step (1) sodium chloride into 0.01 gram, 5 gram, 10 gram respectively in embodiment 1, other each operation is all identical with embodiment 1, obtains product with embodiment 1.

Embodiment 5、 example 6、 example 7、 example 8、 example 9、 example 10、 example 11、 example 12、 example 13

[0031] Step (2) metal chloride in embodiment 1 is respectively changed into lithium chloride, potassium chloride, calcium chloride, magnesium chloride, aluminum chloride, ferric chloride, ferrous chloride, zinc chloride, cupric chloride, Other operations are the same as in Example 1, and the product obtained is the same as in Example 1.

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Abstract

The invention discloses a synthetic method of hexagonal boron nitride nanosheets. The method comprises the following steps: (1) mixing boron nitride nanospheres with metal chloride for 0.5-3 hours to obtain mixed powder; (2) heating the mixed powder obtained in the step (1) to 600-1400 DEG C at a heating speed of 1-30 DEG C / min in a protection atmosphere, performing heat treatment at the temperature for 1-6 hours, cooling to room temperature in the protection atmosphere to obtain a product, and washing the product to obtain the hexagonal boron nitride nanosheets. According to the preparation method, metal chloride is introduced to serve as a mineralizer, and the hexagonal boron nitride nanospheres can be converted into the boron nitride nanosheets at relatively low temperature (600-700 DEG C); the preparation temperature adopted in the method is lower than that of existing boron nitride nanosheets by about 1000 DEG C, so that the energy consumption of the preparation process is greatly reduced.

Description

technical field [0001] The technical solution of the present invention relates to a hexagonal boron nitride ceramic material with a nano-sheet morphology, in particular to a preparation method of a hexagonal boron nitride nano-sheet. Background technique [0002] Boron nitride is an important inorganic ceramic material, which consists of 43.6% boron atoms and 56.4% nitrogen atoms. Its molecular formula is BN, its English name is BoronNitride, and its molecular weight is 24.82. Boron nitride has two different structures, hexagonal and cubic, and the density of hexagonal boron nitride is 2.27g / cm 3 , with a melting point of 3100-3300°C. Industrially produced hexagonal boron nitride materials usually have micron-scale lamellar or irregular structures. With the rise of research on graphene materials, hexagonal boron nitride nanosheets have also received extensive attention. Studies have shown that this material has high thermal conductivity, good electrical insulation, good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064C04B35/5833C04B35/626B82Y30/00B82Y40/00
Inventor 徐学文李杰唐成春罗翰
Owner HEBEI UNIV OF TECH
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