Hexagonal boron nitride two-dimensional ultrathin nanometer sheet as well as preparation method and application thereof

A technology of hexagonal boron nitride and nanosheets, which is applied in the field of nanomaterials to achieve high thermal stability and thermal conductivity, simplify experimental steps, and reduce product costs

Inactive Publication Date: 2013-04-17
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no report on the synthesis of two-dimensional ultrathin nanosheets of hexagonal boron nitride under mild conditions using metal borides as boron sources and ammonium salts as nitrogen sources.

Method used

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  • Hexagonal boron nitride two-dimensional ultrathin nanometer sheet as well as preparation method and application thereof
  • Hexagonal boron nitride two-dimensional ultrathin nanometer sheet as well as preparation method and application thereof
  • Hexagonal boron nitride two-dimensional ultrathin nanometer sheet as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0037] (1) Mix 20mmol calcium hexaboride powder and 120mmol ammonium chloride powder, grind them evenly with a mortar, seal them in a 50mL stainless steel reaction kettle, and raise the temperature from room temperature to 600°C, and react at a constant temperature of 600°C for 24 hours.

[0038] (2) Naturally cool to room temperature, open the reactor and wash the initial product 3 times with dilute nitric acid (3.0mol / L) to remove by-products, then wash with water and ethanol until neutral, centrifuge and vacuum at 80°C After drying for 6 hours, about 2.75 g of hexagonal boron nitride two-dimensional ultrathin nanosheets were obtained.

[0039] The phase and microstructure of the obtained two-dimensional ultrathin nanosheets of hexagonal boron nitride were analyzed by X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and atomic force microscopy.

[0040] X-ray powder diffraction (XRD) character...

Embodiment 2

[0045] (1) Mix 20mmol calcium hexaboride powder and 240mmol ammonium chloride powder, grind them evenly with a mortar, seal them in a 50mL stainless steel reaction kettle, and raise the temperature from room temperature to 500°C, and constant temperature at 500°C for 48 hours.

[0046] (2) Naturally cool to room temperature, open the reactor and wash the initial product 3 times with dilute nitric acid (1.0mol / L) to remove by-products, then wash with water and ethanol until neutral, centrifuge and vacuum at 80°C After drying for 6 hours, about 2.85 g of hexagonal boron nitride two-dimensional ultrathin nanosheets were obtained, with a thickness of about 1.0-2.5 nm.

Embodiment 3

[0048] (1) Mix 20mmol calcium hexaboride powder and 120mmol ammonium bromide powder, grind them evenly with a mortar, seal them in a 50mL stainless steel reaction kettle, and raise the temperature from room temperature to 600°C, and constant temperature reaction at 600°C for 12 hours.

[0049] (2) Naturally cool to room temperature, open the reactor and wash the initial product 5 times with dilute nitric acid (3.0mol / L) to remove by-products, then wash with water and ethanol until neutral, centrifuge and vacuum at 80°C After drying for 6 hours, about 2.45 g of hexagonal boron nitride two-dimensional ultrathin nanosheets were obtained, with a thickness of about 1.0-3.5 nm.

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Abstract

The invention discloses a hexagonal boron nitride two-dimensional ultrathin nanometer sheet as well as a preparation method and application thereof and belongs to the technical field of nanometer materials. According to the invention, metal boride (such as calcium boride, lanthanum boride, magnesium boride, titanium boride and the like) is adopted as a boron resource; ammonium salt (such as ammonium chloride, ammonium bromide, ammonium nitrate and the like) is adopted as a nitrogen source; and the hexagonal boron nitride two-dimensional ultrathin nanometer sheet with the thickness of 0.5-4.0nm is obtained through the reaction under a mild condition (at the temperature of 500-600 DEG C). The invention aims to realize the macro-quantity preparation of the hexagonal boron nitride two-dimensional ultrathin nanometer sheet at the mild temperature by adopting cheaper raw materials; the preparation method has the advantages of saving the energy, simplifying the experimental step and greatly reducing the product cost; and due to the high heat conductivity, heat stability and chemical stability, the hexagonal boron nitride two-dimensional ultrathin nanometer sheet can be applied to the fields of heat dissipation materials, polymer filling materials, catalyst carriers and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and relates to a two-dimensional ultrathin nanosheet of hexagonal boron nitride, a preparation method and application thereof. Background technique [0002] Since the advent of graphene in 2004, inorganic two-dimensional nanomaterials have become a hot spot in the field of material science research due to their unique physical and chemical properties and potential applications, see Adv.Mater.2012,24,210. Hexagonal boron nitride has high temperature resistance, high thermal conductivity, radiation resistance, corrosion resistance, high temperature lubrication and excellent dielectric and insulating properties. It has good applications in various fields, especially in aerospace, national defense, and electronic nuclear industries. Broad research interests. [0003] Hexagonal boron nitride nanosheets have a structure similar to graphene, B atoms and N atoms are composed of sp 2 It is compose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
Inventor 郑明涛刘应亮雷炳富刘晓瑭肖勇董汉武张浩然
Owner SOUTH CHINA AGRI UNIV
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