Thin-layer boron nitride nano-sheet preparation method

Abstract

The invention discloses a thin-layer boron nitride nano-sheet preparation method, which comprises: mixing a boron nitride raw material and an intercalator, putting into a sealed environment, heating,and carrying out an intercalation reaction, so that the intercalator molecules are partially or completely inserted into the layered structure of the boron nitride to form intercalated boron nitride;and vaporizing or decomposing the intercalator molecules in the intercalated boron nitride to generate gas, or carrying out a reaction on the intercalator molecules in the intercalated boron nitride and a selected chemical substance to generate gas, so the boron nitride lamellas are subjected to cleaving and stripping so as to obtain the thin-layer boron nitride nano-sheet. Compared with the method in the prior art, the preparation method of the invention has the following characteristics that the low-cost, rapid, efficient and large-scale preparation of boron nitride nano-sheets can be achieved, and the prepared boron nitride nano-sheets have advantages of large lamellar layer, less layer number and the like, and can be applied to industrial large-scale application.

Description

technical field

[0001] The invention relates to a method for preparing a two-dimensional nanometer material, in particular to a method for preparing a thin-layer boron nitride nanosheet, and belongs to the technical field of nanomaterial preparation. Background technique

[0002] As a research hotspot in the field of nanoscience in recent years, two-dimensional nanomaterials, especially graphene, molybdenum sulfide, boron nitride, etc., have a series of special quantum effects such as surface effects, small size effects, quantum size effects, and macroscopic tunnel effects. , so that the properties of sound, light, electricity, magnetism, heat, and mechanics have undergone major changes compared with macroscopic materials, and people have increased people's enthusiasm for research on two-dimensional nanomaterials. Graphene, which has been a hot research material in recent years, has been theoretically confirmed that the thermal conductivity of single-layer graphene is as hig...

Examples

preparation example Construction

[0018] Further, a method for preparing thin-layer boron nitride nanosheets provided by an embodiment of the present invention includes:

[0019] The boron nitride raw material is mixed with the intercalation agent, placed in a sealed environment, and heated for intercalation reaction, so that the intercalation agent molecules are partially or completely inserted into the layered structure of boron nitride to form intercalated boron nitride;

[0020] Vaporize or decompose the intercalant molecules in the intercalated boron nitride to generate gases, or react the intercalant molecules in the intercalated boron nitride with selected chemical substances to generate gases, so that the boron nitride sheets are cleaved and peeled off , to obtain thin boron nitride nanosheets.

[0021] Further, the boron nitride raw material includes any one of flake boron nitride, boron nitride powder and boron nitride bulk material, but is not limited thereto.

[0022] Further, the intercalation ag...

Embodiment 1

[0034] Embodiment 1: the preparation method of this thin-layer boron nitride nanosheet comprises: adopt anhydrous ferric chloride as intercalation agent, during reaction, 3g anhydrous ferric chloride powder and 1g boron nitride powder (particle size about 10 -20 microns), respectively placed in two sections of the intercalation chamber, after the intercalation chamber is sealed, the pressure is at normal pressure, placed in a high-temperature oven, the reaction temperature is adjusted to 300 ° C, and the reaction time is 40 hours. After the reaction was completed, the intercalation chamber was taken out, opened and cleaned, and it was found that the original white boron nitride powder had changed to light yellow. XRD analysis was carried out on the powder after intercalation ( figure 1 ), it can be seen that boron nitride is intercalated by ferric chloride to produce a new intercalation peak, and the intercalation is 2-order intercalation. Put the intercalation in hydrogen pe...

Embodiment 2

[0035] Embodiment 2: The preparation method of this thin-layer boron nitride nanosheet comprises: using anhydrous copper chloride as intercalation agent, during reaction, 10g anhydrous copper chloride powder and 1g boron nitride (10-20 micron) The powder is fully stirred and mixed evenly, and placed in a closed quartz container, the closed quartz container is placed in a muffle furnace, the reaction temperature is adjusted to 700 ° C, and the reaction time is 60 hours. After the reaction was completed, the intercalation chamber was taken out, opened and cleaned, and it was found that the original white boron nitride powder had changed to light yellow. Wash the reactants after intercalation, dry them at 100°C, place them in a near-vacuum reaction vessel, and heat them rapidly to 1500°C, so that the copper chloride in the intercalation part is rapidly vaporized, and the boron nitride is cleaved and peeled off. , and then through pickling, ultrasonic cleaning with pure water, and...

technical field

[0001] The invention relates to a method for preparing a two-dimensional nanometer material, in particular to a method for preparing a thin-layer boron nitride nanosheet, and belongs to the technical field of nanomaterial preparation. Background technique

[0002] As a research hotspot in the field of nanoscience in recent years, two-dimensional nanomaterials, especially graphene, molybdenum sulfide, boron nitride, etc., have a series of special quantum effects such as surface effects, small size effects, quantum size effects, and macroscopic tunnel effects. , so that the properties of sound, light, electricity, magnetism, heat, and mechanics have undergone major changes compared with macroscopic materials, and people have increased people's enthusiasm for research on two-dimensional nanomaterials. Graphene, which has been a hot research material in recent years, has been theoretically confirmed that the thermal conductivity of single-layer graphene is as hig...

Examples

preparation example Construction

[0018] Further, a method for preparing thin-layer boron nitride nanosheets provided by an embodiment of the present invention includes:

[0019] The boron nitride raw material is mixed with the intercalation agent, placed in a sealed environment, and heated for intercalation reaction, so that the intercalation agent molecules are partially or completely inserted into the layered structure of boron nitride to form intercalated boron nitride;

[0020] Vaporize or decompose the intercalant molecules in the intercalated boron nitride to generate gases, or react the intercalant molecules in the intercalated boron nitride with selected chemical substances to generate gases, so that the boron nitride sheets are cleaved and peeled off , to obtain thin boron nitride nanosheets.

[0021] Further, the boron nitride raw material includes any one of flake boron nitride, boron nitride powder and boron nitride bulk material, but is not limited thereto.

[0022] Further, the intercalation ag...

Embodiment 1

[0034] Embodiment 1: the preparation method of this thin-layer boron nitride nanosheet comprises: adopt anhydrous ferric chloride as intercalation agent, during reaction, 3g anhydrous ferric chloride powder and 1g boron nitride powder (particle size about 10 -20 microns), respectively placed in two sections of the intercalation chamber, after the intercalation chamber is sealed, the pressure is at normal pressure, placed in a high-temperature oven, the reaction temperature is adjusted to 300 ° C, and the reaction time is 40 hours. After the reaction was completed, the intercalation chamber was taken out, opened and cleaned, and it was found that the original white boron nitride powder had changed to light yellow. XRD analysis was carried out on the powder after intercalation ( figure 1 ), it can be seen that boron nitride is intercalated by ferric chloride to produce a new intercalation peak, and the intercalation is 2-order intercalation. Put the intercalation in hydrogen pe...

Embodiment 2

[0035] Embodiment 2: The preparation method of this thin-layer boron nitride nanosheet comprises: using anhydrous copper chloride as intercalation agent, during reaction, 10g anhydrous copper chloride powder and 1g boron nitride (10-20 micron) The powder is fully stirred and mixed evenly, and placed in a closed quartz container, the closed quartz container is placed in a muffle furnace, the reaction temperature is adjusted to 700 ° C, and the reaction time is 60 hours. After the reaction was completed, the intercalation chamber was taken out, opened and cleaned, and it was found that the original white boron nitride powder had changed to light yellow. Wash the reactants after intercalation, dry them at 100°C, place them in a near-vacuum reaction vessel, and heat them rapidly to 1500°C, so that the copper chloride in the intercalation part is rapidly vaporized, and the boron nitride is cleaved and peeled off. , and then through pickling, ultrasonic cleaning with pure water, and...

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