Method of utilizing urea assisted ultrasound to prepare hexagonal boron nitride nanosheet

A hexagonal boron nitride and nanosheet technology, applied in chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems of large-scale preparation and application of BNNS, expensive chemical vapor deposition, and large environmental pollution. The effect of high production efficiency, convenient operation and simple and convenient operation

Inactive Publication Date: 2017-08-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many limitations in the above methods, which limit the large-scale preparation and application of BNNS.
For example, the mechanical exfoliation method will introduce defects to the nanosheets. The liquid phase ultrasonic exfoliation method often uses organic solvents, which is difficult to post-process and pollutes the environment. The chemical vapor deposition method often requires expensive and complicated equipment and uses toxic gases such as ammonia.

Method used

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  • Method of utilizing urea assisted ultrasound to prepare hexagonal boron nitride nanosheet
  • Method of utilizing urea assisted ultrasound to prepare hexagonal boron nitride nanosheet
  • Method of utilizing urea assisted ultrasound to prepare hexagonal boron nitride nanosheet

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) According to the ratio of 1g hexagonal boron nitride powder to 100ml water, mix hexagonal boron nitride with water and stir, then add urea 60g (mass ratio to hexagonal boron nitride powder 60:1), continue stirring, and prepare into a mixture.

[0027] (2) The mixture was placed in an ice bath and subjected to ultrasonic treatment for 8 hours under the condition of a power of 200w (500w×40%).

[0028] (3) Finally, the obtained dispersion was centrifuged at 3000 rpm for 30 minutes to remove unstripped boron nitride powder. The supernatant was taken for filtration, and the filtered product was washed with deionized water for 2-3 times, and dried at 60° C. for 8 hours to obtain boron nitride nanosheets.

[0029] figure 1 It is the cross-sectional scanning electron microscope image of the boron nitride nanosheets prepared in Example 1 of the present invention. It is observed under the electron microscope that the boron nitride nanosheets are piled up in the form of irr...

Embodiment 2

[0031] (1) According to the ratio of 1g of hexagonal boron nitride powder to 200ml of water, mix hexagonal boron nitride with water and stir, then add 100g of urea (mass ratio to hexagonal boron nitride powder: 100:1), continue stirring, and prepare into a mixture.

[0032] (2) The mixture was placed in an ice bath and ultrasonically treated for 4 hours under the condition of a power of 200w (500w×40%).

[0033] (3) Finally, the obtained dispersion was centrifuged at 3000 rpm for 30 minutes to remove unstripped boron nitride powder. The supernatant was taken for filtration, and the filtered product was washed with deionized water for 2-3 times, and dried at 60° C. for 8 hours to obtain boron nitride nanosheets.

Embodiment 3

[0035] (1) According to the ratio of 1g of hexagonal boron nitride powder to 50ml of water, mix hexagonal boron nitride with water and stir, then add 20g of urea (mass ratio to hexagonal boron nitride powder: 20:1), continue stirring, and prepare into a mixture.

[0036] (2) The mixture was placed in an ice bath and subjected to ultrasonic treatment for 10 hours under the condition of a power of 200w (500w×40%).

[0037] (3) Finally, the obtained dispersion was centrifuged at 3000 rpm for 30 minutes to remove unstripped boron nitride powder. The supernatant was taken for filtration, and the filtered product was washed with deionized water for 2-3 times, and dried at 60° C. for 8 hours to obtain boron nitride nanosheets.

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Abstract

The invention discloses a method of utilizing urea assisted ultrasound to prepare a hexagonal boron nitride nanosheet. The method includes: step 1, mixing and stirring hexagonal boron nitride powder with water according to a proportion of 1g:50-200ml, adding urea according to a mass ratio of urea to the hexagonal boron nitride powder being 20-100:1, and continuing stirring to obtain a mixture; step 2, putting the mixture obtained in the step 1 in ice bath, and ultrasonically treating for 2-10h to obtain dispersion liquid; step 3, centrifuging the dispersion liquid obtained in the step 2, taking supernatant liquid for filtering, using deionized water to wash a product obtained by filtering, and drying a product to obtain the boron nitride nanosheet. Water is utilized as a solvent to replace an organic solvent, and the urea serves as an additive, so that the method is convenient to operate, low in cost, free of environment pollution, high in yield and conducive to realizing large-scale production.

Description

technical field [0001] The invention relates to a method for preparing boron nitride nanosheets, in particular to a method for preparing hexagonal boron nitride nanosheets by using urea-assisted ultrasound. Background technique [0002] Due to the novel properties of nanomaterials with layered structure, they are the hotspots of current research. As an important two-dimensional nanomaterial, hexagonal boron nitride nanosheets (BNNS, also known as white graphene), a graphene analogue, has many excellent properties, such as high intrinsic thermal conductivity, excellent chemical Stability and thermal stability, electrical insulation properties. Since its discovery, it has been one of the most intensively studied two-dimensional non-carbon nanomaterials, and has been widely used in many fields such as nanocomposites, dielectric substrates, sensors, catalysts, and high-temperature anti-oxidation coatings. So far, the methods for preparing BNNS include mechanical exfoliation, l...

Claims

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Application Information

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IPC IPC(8): C01B21/064B82Y40/00
CPCC01B21/0648C01P2002/01C01P2004/03C01P2004/04C01P2004/24
Inventor熊传溪刘维王珊陈浩杨全岭
OwnerWUHAN UNIV OF TECH