Method for preparing hexagonal boron nitride nanosheets by chemical stripping

A hexagonal boron nitride, nanosheet technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc. Small size and other problems, to achieve the effect of being conducive to large-scale production, low cost, and simple operation

Inactive Publication Date: 2014-03-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have certain deficiencies that limit the large-scale commercial production of boron nitride nanosheets
For example, the yield of the mechanical exfoliation method is very low; the size of the boron nitride nanosheets obtained by the liquid phase exfoliation method is small, and post-processing is troublesome; the equipment conditions of the vapor deposition method are harsh, the experimental process is difficult to control, and the toxicity is very high

Method used

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  • Method for preparing hexagonal boron nitride nanosheets by chemical stripping
  • Method for preparing hexagonal boron nitride nanosheets by chemical stripping
  • Method for preparing hexagonal boron nitride nanosheets by chemical stripping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Mix 1g of hexagonal boron nitride powder with 100ml of sulfuric acid and stir evenly, then add 0.5g of potassium permanganate (the mass ratio of potassium permanganate to boron nitride is 1:2), and continue to stir and react to form a mixture ;

[0016] (2) Put the mixture in an ice bath, stir and react for 12 hours; then add hydrogen peroxide dropwise to remove the remaining potassium permanganate;

[0017] (3) Finally, the reaction product was washed with water to a pH value of 6-8, then dissolved in absolute ethanol for separation, and the unstripped boron nitride powder was removed to obtain boron nitride nanosheets.

[0018] figure 1 The scanning electron micrographs of the boron nitride nanosheets prepared in this example are given.

[0019] figure 2 The transmission electron micrographs of the boron nitride nanosheets prepared in this example are given.

[0020] image 3 The atomic force microscope photos and thicknesses of the boron nitride nanosheets ...

Embodiment 2

[0022] (1) Mix 3g of hexagonal boron nitride powder and 100ml of nitric acid and stir evenly, then add 3g of potassium permanganate (the mass ratio of potassium permanganate to boron nitride is 1:1), continue to stir and react to make a mixture;

[0023] (2) Put the mixture in an ice bath, stir and react for 10 hours; then add hydrogen peroxide dropwise to remove the remaining potassium permanganate;

[0024] (3) Finally, the reaction product was washed with water to a pH value of 6-8, then dissolved in absolute ethanol for separation, and the unstripped boron nitride powder was removed to obtain boron nitride nanosheets.

Embodiment 3

[0026] (1) Mix 5g of hexagonal boron nitride powder with 100ml of sulfuric acid and stir evenly, then add 0.5g of potassium permanganate (the mass ratio of potassium permanganate to boron nitride is 1:10), continue to stir and react to make a mixture ;

[0027] (2) Put the mixture in an ice bath, stir and react for 24 hours; then add hydrogen peroxide dropwise to remove the remaining potassium permanganate;

[0028] (3) Finally, the reaction product was washed with water to a pH value of 6-8, then dissolved in absolute ethanol for separation, and the unstripped boron nitride powder was removed to obtain boron nitride nanosheets.

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Abstract

The invention provides a method for preparing hexagonal boron nitride nanosheets by chemical stripping, which comprises the following steps: (1) uniformly mixing and stirring every 0.5-5g of hexagonal boron nitride powder with 100ml of acid, adding potassium permanganate according to the potassium permanganate / hexagonal boron nitride powder mass ratio of 1:10:10:1, and continuing stirring to prepare a mixture; (2) stirring the mixture in an ice bath to react for 1-24 hours; dropwisely adding oxydol to remove the residual potassium permanganate; and (3) finally, washing the reaction product with water until the pH value is 6-8, dissolving in anhydrous ethanol for separation, and removing unstripped boron nitride powder to obtain the boron nitride nanosheets. The acid, potassium permanganate, oxydol and hexagonal boron nitride react together to prepare the boron nitride nanosheets; and thus, the method is simple to operate and low in cost, does not need complex or expensive equipment, and is beneficial to large-scale production.

Description

technical field [0001] The invention relates to a method for preparing hexagonal boron nitride nanosheets by chemical liquid phase stripping, and belongs to the technical field of crystal materials. Background technique [0002] Since Geim and Novoselov from the Department of Physics and Astronomy, University of Manchester, UK discovered graphene, a new type of two-dimensional nanomaterial in 2004, two-dimensional materials and their special properties have attracted more and more attention. Hexagonal boron nitride (h-BN) and graphene both have similar layered structures in structure, so they have attracted the attention and interest of many research groups at home and abroad. It is worth noting that h-BN has many special properties compared with graphene; for example, excellent physical and chemical properties such as wide band gap, high thermal conductivity, and excellent oxidation resistance. h-BN has great application prospects in high temperature resistance, deep ultra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y30/00
Inventor 郝霄鹏杜淼吴拥中
Owner SHANDONG UNIV
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