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A method for exfoliating two-dimensional materials

A two-dimensional material, bulk technology, applied in the field of two-dimensional material exfoliation, can solve the problem of long time and achieve the effect of short time consumption

Inactive Publication Date: 2020-10-13
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a brand-new stripping method of two-dimensional materials; further, the stripping method of two-dimensional materials provided by the present invention can solve the problem of long time-consuming commonly existing in the main stripping methods of two-dimensional materials

Method used

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  • A method for exfoliating two-dimensional materials
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  • A method for exfoliating two-dimensional materials

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Embodiment 1 6

[0040] The stripping of embodiment 1 hexagonal boron nitride

[0041]After heating 0.5 g of commercial block hexagonal boron nitride (hexagonal boron nitride powder) to 800°C, it was directly put into 50 mL of ice-water mixture, ultrasonicated for 30 minutes, and then freeze-dried.

Embodiment 2 6

[0042] The stripping of embodiment 2 hexagonal boron nitride

[0043] Heat 0.5g of commercial block hexagonal boron nitride (hexagonal boron nitride powder) to 900°C, put it directly into 50mL of ice-water mixture, ultrasonicate for 30 minutes, and then freeze-dry;

[0044] After the freeze-dried product was heated to 900°C, it was directly put into 50 mL of ice-water mixture, ultrasonicated for 30 minutes at the same time, and then freeze-dried.

Embodiment 3 6

[0045] The stripping of embodiment 3 hexagonal boron nitride

[0046] Heat 0.5g of commercial block hexagonal boron nitride (hexagonal boron nitride powder) to 900°C, put it directly into 50mL of ice-water mixture, ultrasonicate for 30 minutes, and then freeze-dry;

[0047] After heating the freeze-dried product to 900°C, put it directly into a 50mL ice-water mixture, ultrasonicate for 30 minutes at the same time, and then freeze-dry;

[0048] After the second freeze-dried product was heated to 900°C, it was directly put into 50 mL of ice-water mixture, ultrasonicated for 30 minutes, and then freeze-dried.

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Abstract

The invention provides a stripping method of a two-dimensional material. The stripping method comprises steps of (1) heating up a blocky two-dimensional material to 600 DEG C or more; (2) putting the heated blocky two-dimensional material in a cooling solvent so as to obtain a material stripping system, wherein the temperature difference between the blocky two-dimensional material and the cooling solvent is at least 600 DEG C; (3) freeze drying a part of or the whole material stripping system. Compared with a solid phase mechanical stripping method, the stripping method at least has the advantage of consuming less time. Compared with liquid phase stripping, the method has the advantages of consuming less time, and having no impurities inserted among layers after freeze drying, so that the method reduces the step of complex chemical purification, particularly, the method is more environment-friendly due to using water as the cooling solvent.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic nanometer materials, in particular to a stripping method of two-dimensional materials. Background technique [0002] Two-dimensional materials, also known as two-dimensional nanomaterials, such as graphene, hexagonal boron nitride, carbon nitride, and transition metal sulfides, have received extensive attention in terms of mechanical, electronic, and thermodynamic properties. Two-dimensional ultra-thin materials with single or few layers obtained by exfoliation have a wide range of applications. In 2004, graphite was exfoliated into graphene by mechanical exfoliation. Since then, 2D materials have attracted extensive research and attention. Similar to graphite, bulk boron nitride exfoliated into few-layer boron nitride has also been extensively studied in recent years. So far, the main exfoliation methods for single-layer or few-layer (2-10 layers) two-dimensional materials are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19C01B21/064C01G39/06C01G41/00C01B19/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B19/007C01B21/0648C01B2204/02C01B2204/04C01G39/06C01G41/00C01P2004/20C01P2004/64
Inventor 杨晓晶孙泽民孙根班王全
Owner BEIJING NORMAL UNIVERSITY
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