Method for preparing boron nitride nanosheet by using eutectic salt to strip boron nitride powder at high temperature

A high-temperature exfoliation and powder preparation technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nitrogen compounds, etc., can solve the problem of uneven size of boron nitride nanosheets and bending deformation of boron nitride nanosheets , high energy consumption in the synthesis process, etc., to achieve the effect of easy operation, simple operation and high aspect ratio

Active Publication Date: 2016-04-27
香港城市大学深圳研究院
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Problems solved by technology

[0004] Generally speaking, the above preparation process routes all use high temperature, which makes the size of the synthesized boron nitride nanosheets uneven, and there is abnormal growth of crystal grains. The diameter distribution of the obtained boron nitride nanosheets ranges from nanometer to in the micron range
Moreover, high temperature synthesis conditions will cause boron nitride nanosheets to bend and deform, which will also lead to high energy consumption in the synthesis process and increase safety hazards in production.
[0005] In addition, although there are many successful methods of exfoliating graphite to prepare graphene or graphene oxide, the process of exfoliating boron nitride to prepare boron nitride nanosheets still faces many technical problems

Method used

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  • Method for preparing boron nitride nanosheet by using eutectic salt to strip boron nitride powder at high temperature
  • Method for preparing boron nitride nanosheet by using eutectic salt to strip boron nitride powder at high temperature
  • Method for preparing boron nitride nanosheet by using eutectic salt to strip boron nitride powder at high temperature

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Embodiment 1

[0035] This embodiment provides a method for preparing boron nitride nanosheets by exfoliating boron nitride powder at high temperature using a eutectic salt, the method comprising the following steps:

[0036](1) 0.67g pre-dried raw material hexagonal boron nitride (h-BN) micropowder (particle diameter is about 10 microns), sodium chloride and potassium chloride eutectic salt, wherein sodium chloride is 14.87g, chlorine Potassium chloride is 18.47g, joins in the mortar and mixes and grinds, obtains uniform white mixing powder;

[0037] (2) Put the mixed powder obtained in step (1) into a 100mL alumina crucible, then put the crucible into a muffle furnace, and heat the mixed powder from room temperature to 670°C, then keep the temperature for 72 hours for high temperature heat treatment, after the air atmosphere drops to room temperature, the mixed powder after high temperature heat treatment is obtained;

[0038] (3) The mixed powder after the high-temperature heat treatment...

Embodiment 2

[0042] This embodiment provides a method for preparing boron nitride nanosheets by exfoliating boron nitride powder with eutectic salt at high temperature. This method is basically the same as the method in Example 1, except that the high temperature of step (2) The time of heat treatment was changed from 72 hours to 5 hours, and the temperature of high temperature heat treatment was unchanged.

[0043] The SEM image of the boron nitride nanosheets prepared by the method of this embodiment is as follows Figure 4 shown by Figure 4 Compared Figure 1-Figure 3c It can be seen that after the high temperature heat treatment time is changed from 72 hours to 5 hours, the quality of the prepared product boron nitride nanosheets decreases.

Embodiment 3

[0045] This embodiment provides a method for preparing boron nitride nanosheets by exfoliating boron nitride powder with eutectic salt at high temperature. This method is basically the same as the method in Example 1, except that the high temperature of step (2) The time of heat treatment was changed from 72 hours to 12 hours, and the temperature of high temperature heat treatment was unchanged.

[0046] The SEM image of the boron nitride nanosheets prepared by the method of this embodiment is as follows Figure 5 shown by Figure 5 Compared Figure 1-Figure 3c It can be seen that after the high temperature heat treatment time is changed from 72 hours to 12 hours, the quality of the prepared product boron nitride nanosheets decreases.

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Abstract

The invention provides a method for preparing a boron nitride nanosheet by using a eutectic salt to strip boron nitride powder at high temperature. The method comprises following steps: grinding and mixing sodium chloride/potassium chloride eutectic salt with boron nitride powder, thermally treating at high temperature, and preparing in steps such as ultrasonic treatment, filtering, cleaning and drying to obtain the boron nitride nanosheet. The stripping method provided by the invention enables the preparation of a boron nitride nanosheet which is high in aspect ratio (that is large in lateral dimension and small in thickness), low in defect quantity and complete in structural features, and this method is suitable for batch production, does not relate to the use of toxic corrosive chemical reagents and is easy to perform.

Description

technical field [0001] The invention relates to a method for preparing boron nitride nanosheets, in particular to a method for preparing boron nitride nanosheets by exfoliating boron nitride powder at high temperature with a eutectic salt, and belongs to the technical field of inorganic materials. Background technique [0002] As a graphite-like compound, boron nitride (BN) exhibits many attractive properties in the field of material science research, such as high intrinsic thermal conductivity, excellent chemical and thermal stability, wide band gap, and good lubricating properties. In particular, boron nitride nanosheets (boronnitridenanosheets, BNNS) have higher aspect ratio (aspectratio) and specific surface area, compared with its bulk material, it shows better material properties. [0003] In recent years, much work has been devoted to the controlled synthesis of boron nitride nanosheets. The main preparation methods include several methods such as carbothermal, ammo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
CPCC01B21/0648C01P2004/03C01P2004/04C01P2004/24
Inventor 支春义王子峰
Owner 香港城市大学深圳研究院
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