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A preparation method of regular hexagonal hexagonal boron nitride nanosheets

A hexagonal boron nitride and hexagonal technology is applied in the field of preparation of nanomaterials, which can solve the problems of precise control of the morphology of boron nitride nanosheets, and achieve the effects of low cost, good repeatability and simple operation.

Active Publication Date: 2019-12-17
王子韩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although there are various methods for preparing boron nitride nanosheets, there is no method that can accurately control the morphology of boron nitride nanosheets. Therefore, the present invention proposes a method for preparing hexagonal Preparation method of boron nitride nanosheets

Method used

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  • A preparation method of regular hexagonal hexagonal boron nitride nanosheets
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  • A preparation method of regular hexagonal hexagonal boron nitride nanosheets

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Effect test

Embodiment 1

[0026] (a) Place the treated copper foil in the quartz tube, then place the magnetic boat filled with ammonia borane at the other end of the quartz tube, and pass nitrogen gas into the quartz tube at a speed of 100 sccm to catch the gas, after 5 minutes , close the gas valve to stop the nitrogen gas flow, and then quickly heat up one end of the quartz tube with the copper foil to 800°C, and calcined for 45 minutes;

[0027] (b) Continue to maintain the above calcination temperature, open the gas inlet valve, and simultaneously feed nitrogen and ammonia into the quartz tube respectively, wherein the flow rate of nitrogen gas is adjusted to 50 sccm, and the flow rate of ammonia gas is 100 sccm. After that, adjust the heating program and start Carry out a temperature program for the quartz tube, wherein the temperature is first raised to 950°C at a rate of 5°C / min, and then raised to 1010°C at a rate of 1°C / min;

[0028] (c) After temperature programming, after reaching the growt...

Embodiment 2

[0031] A method for preparing regular hexagonal hexagonal boron nitride nanosheets, comprising the following steps:

[0032] (a) Place the treated copper foil in the quartz tube, then place the magnetic boat filled with ammonia borane at the other end of the quartz tube, and pass nitrogen gas into the quartz tube at a speed of 500 sccm, and after 2 minutes , close the gas valve to stop the nitrogen gas flow, and then quickly heat up one end of the quartz tube with the copper foil to 900°C, and calcined for 30 minutes;

[0033] (b) Continue to maintain the above calcination temperature, open the gas inlet valve, and simultaneously feed nitrogen and ammonia into the quartz tube respectively, wherein the flow rate of nitrogen gas is adjusted to 250 sccm, and the flow rate of ammonia gas is 160 sccm. After that, adjust the heating program and start Carry out a temperature program for the quartz tube, wherein the temperature is first raised to 1000°C at a rate of 10°C / min, and then...

Embodiment 3

[0037] A method for preparing regular hexagonal hexagonal boron nitride nanosheets, comprising the following steps:

[0038] (a) Place the treated copper foil in the quartz tube, then place the magnetic boat filled with ammonia borane at the other end of the quartz tube, and blow nitrogen gas into the quartz tube at a speed of 200 sccm, after 4 minutes , close the gas valve to stop the nitrogen gas flow, then rapidly raise the temperature of one end of the quartz tube with the copper foil to 850°C, and calcinate for 26 minutes;

[0039] (b) Continue to maintain the above calcination temperature, open the gas inlet valve, and simultaneously feed nitrogen and ammonia into the quartz tube respectively, wherein the flow rate of nitrogen gas is adjusted to 150 sccm, and the flow rate of ammonia gas is 120 sccm. After that, adjust the heating program and start Carry out a temperature program for the quartz tube, wherein the temperature is raised to 960°C at a rate of 7°C / min, and th...

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Abstract

The invention relates to a preparation method of a regular hexagonal boron nitride nanosheet. The preparation method comprises the following steps: firstly putting treated copper foil in a quartz tube, then putting a magnetic boat filled with ammonia borane at the other end of the quartz tube, introducing nitrogen gas into the quartz tube at a speed of 100-500 sccm for expelling air, closing a gasvalve after 2-5 min to stop the introduction of the nitrogen gas, then quickly increasing the temperature of one end of the quartz tube with the copper foil to 800-900 DEG C, preferably 850-900 DEG Cand calcining for 30-45 minute; secondly, continuously keeping the calcining temperature, opening gas introduction valves and simultaneously respectively introducing nitrogen gas and ammonia gas intothe quartz tube; thirdly, keeping growing for 20-30 minutes at the temperature after the programmed temperature rise is performed, and the growth temperature of a boron nitride nanosheet is reached,closing the nitrogen gas introduction valve at the moment, simultaneously adjusting the nitrogen gas introduction valve and controlling the flow rate of the ammonia gas to be 20-70 sccm; and finally,closing the ammonia gas introduction valve, quickly moving the quartz tube out of heating equipment and taking out the copper foil after the temperature of the quartz tube is reduced to a room temperature.

Description

technical field [0001] The invention relates to the field of preparation of nanomaterials, in particular to a method for preparing regular hexagonal hexagonal boron nitride nanosheets. Background technique [0002] Hexagonal boron nitride (h-BN) is a common layered material. Its appearance is white loose and soft powder, also known as "white graphite". It is generally prepared by synthesis of boron oxide and boric acid. It has ultra-high chemical stability, thermal stability, low dielectric constant, high thermal conductivity, high heat resistance, excellent oxidation resistance and wave transparency. Therefore, it has always attracted many scientists to conduct in-depth research on its synthesis and performance. [0003] Boron nitride nanosheets maintain the excellent properties of bulk boron nitride, but the performance of boron nitride nanosheets has a great relationship with its sheet thickness and morphology. In order to obtain regular shapes and ultra-thin boron nitr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/064C01P2002/72C01P2004/04
Inventor 吴亚奇其他发明人请求不公开姓名
Owner 王子韩