Stable method for preparing boron nitride nanoflake through liquid-phase chemical stripping

A technology of boron nitride and nanosheets, which is applied in chemical instruments and methods, inorganic chemistry, nitrogen compounds, etc., can solve the limitations of the preparation and application of boron nitride nanosheets, the time-consuming and high reaction temperature of ultrasonic-assisted solvent stripping Or reaction pressure and other issues, to achieve the effect of favorable peeling, low cost, safety and environmental protection

Active Publication Date: 2016-11-09
山东晶亿新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods have successfully prepared boron nitride nanosheets, there are still some shortcomings in these methods, which limit the preparation and application of boron nitride nanosheets.
For example, the mechanical exfoliation method generally tends to cause certain defects to the nanosheets, the chemical exfoliation method sometimes requires the use of dangerous or toxic chemical reagents and produces harmful by-products, the ultrasonic-assisted solvent exfoliation method takes a long time, chemical vapor deposition and Solid phase reaction method generally needs to use higher reaction temperature or reaction pressure, complex and expensive equipment

Method used

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  • Stable method for preparing boron nitride nanoflake through liquid-phase chemical stripping
  • Stable method for preparing boron nitride nanoflake through liquid-phase chemical stripping
  • Stable method for preparing boron nitride nanoflake through liquid-phase chemical stripping

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Fully stir 1g of hexagonal boron nitride powder and 60ml of concentrated sulfuric acid and soak for 4 hours, then add 3g of potassium ferrate, continue to stir, and mix evenly;

[0034] (2) The mixture was stirred and reacted at 20° C. for 10 hours, and then the reactants were added dropwise to distilled water for dilution;

[0035] (3) centrifuging the diluted solution to remove bulk unstripped boron nitride powder;

[0036] (4) The reaction product was obtained by suction filtration, washed 2-3 times with hydrochloric acid, and then washed with deionized water until neutral, and dried at 60° C. for 10 hours to obtain boron nitride nanosheets.

[0037] The scanning electron micrograph of the boron nitride nanosheet prepared in this embodiment is as follows: figure 1 Shown; The low magnification transmission electron microscope photo of the boron nitride nanosheet prepared in the present embodiment is as follows figure 2 Shown; The high magnification transmission...

Embodiment 2

[0039](1) Fully stir 1g of hexagonal boron nitride powder and 100ml of nitric acid and infiltrate for 2 hours, then add 3g of potassium ferrate, continue to stir, and mix evenly;

[0040] (2) The mixture was stirred and reacted at 30° C. for 24 hours, and then the reactant was added dropwise to distilled water for dilution;

[0041] (3) centrifuging the diluted solution to remove bulk unstripped boron nitride powder;

[0042] (4) The reaction product was obtained by suction filtration, washed 2-3 times with hydrochloric acid, and then washed with deionized water until neutral, and dried at 60° C. for 10 hours to obtain boron nitride nanosheets.

Embodiment 3

[0044] (1) Fully stir 1g of hexagonal boron nitride powder and 100ml of sulfuric acid and soak for 6 hours, then add 5g of potassium ferrate, continue to stir, and mix evenly;

[0045] (2) The mixture was stirred and reacted at 60° C. for 10 hours, and after cooling, the reactant was added dropwise to distilled water for dilution;

[0046] (3) centrifuging the diluted solution to remove bulk unstripped boron nitride powder;

[0047] (4) The reaction product was obtained by suction filtration, washed 2-3 times with hydrochloric acid, and then washed with deionized water until neutral, and dried at 60° C. for 10 hours to obtain boron nitride nanosheets.

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Abstract

The invention discloses a stable method for preparing a boron nitride nanoflake through liquid-phase chemical stripping. The method comprises the following steps: (1) subjecting hexagonal boron nitride and strong acid to mixing and infiltration, adding ferrate, carrying out uniform mixing and then carrying out a reaction; (2) after the reaction, adding a reaction product into distilled water drop by drop for dilution; (3) subjecting a diluted solution to centrifugation so as to remove large pieces of unstripped boron nitride powder; and (4) subjecting supernatant liquid to pumping filtration so as to obtain a reaction product, cleaning the reaction product with hydrochloric acid at first, then washing the reaction product with deionized water until the reaction product is neutral and drying the product so as to obtain the boron nitride nanoflake. According to the invention, the boron nitride nanoflake is prepared through a reaction between strong acid and ferrate; raw materials are easily available; the method is safe, stable, free of pollution and simple to operate; complex and expensive equipment is not needed; and the boron nitride nanoflake is high in yield and good in quality.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of inorganic non-metallic materials, and in particular relates to a method for preparing boron nitride nanosheets through stable liquid-phase chemical exfoliation. Background technique [0002] In 2004, Geim and Novoselov from the University of Manchester, UK, used a simple "micromechanical force splitting method" to prepare a two-dimensional nanomaterial with a single atomic layer thickness - graphene. Starting from this, graphene and similar Graphene two-dimensional materials have gradually become one of the research focuses. [0003] Hexagonal boron nitride (h-BN) has a similar layered structure to graphite, and each layer is composed of B atoms and N atoms alternately arranged to form an infinitely extending hexagonal honeycomb structure. Because of its white color, there is a "white graphite "The name. Boron nitride nanosheets have excellent mechanical properties, high thermal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064
CPCC01B21/064C01P2004/03C01P2004/04
Inventor 毕见强孙国勋王伟礼赵庆强郝旭霞高希成邱妍
Owner 山东晶亿新材料有限公司
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