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A kind of preparation method of selenium nanosheet

A technology of selenium nanometer and aluminum selenide, which is applied in the field of nanomaterials, can solve the problems of low output of selenium nanosheets, complex preparation process, and harsh conditions, and achieve the effects of small thickness, high environmental stability, and low cost

Active Publication Date: 2021-09-10
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a method for preparing selenium nanosheets to solve the problems of low yield, large thickness, harsh conditions, and complicated preparation processes in the preparation process of selenium nanosheets.

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  • A kind of preparation method of selenium nanosheet
  • A kind of preparation method of selenium nanosheet
  • A kind of preparation method of selenium nanosheet

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preparation example Construction

[0028] The invention provides a preparation method of selenium nanosheets, comprising the following steps:

[0029] Etching: provide a hydrofluoric acid solution with a mass fraction of 5% to 20%, add aluminum selenide to the hydrofluoric acid solution to obtain a hydrofluoric acid mixed system, and transfer the hydrofluoric acid mixed system to 50-20% Stir at 80°C for 1 to 5 hours, after stirring, perform primary centrifugation on the hydrofluoric acid mixed system and collect the precipitate;

[0030] Liquid phase stripping: add the precipitate to the dispersant, and then ultrasonically treat the dispersant with a probe for 4-24 hours. The ultrasonic power of the probe is 200-400W, and the temperature of the dispersant during the ultrasonic probe does not exceed 25 ℃;

[0031] Collecting the selenium nanosheets by centrifugation: performing secondary centrifugation on the ultrasonicated dispersant, collecting the supernatant to obtain a selenium nanosheet dispersion, and th...

Embodiment 1

[0042] A preparation method of selenium nanosheets, comprising the following steps:

[0043] Etching: 15ml of hydrofluoric acid solution with a mass fraction of 10% was provided, and 100mg of aluminum selenide with a fineness of 200 mesh was added to the hydrofluoric acid solution to obtain a hydrofluoric acid mixed system. Then transfer the hydrofluoric acid mixed system to 65° C. and stir for 2 hours. During the stirring process, the hydrofluoric acid etches the aluminum in the aluminum selenide, thereby obtaining a multilayer microstructure of selenium that has been preliminarily stripped. After the etching, the hydrofluoric acid mixed system was centrifuged at 7500rpm for 10 minutes, and the precipitate was collected after centrifugation, washed three times with deionized water, and dried after washing. This step can effectively remove the residual hydrofluoric acid, prevent the residual hydrofluoric acid from affecting the subsequent liquid phase stripping process, and al...

Embodiment 2

[0050] A preparation method of selenium nanosheets, comprising the following steps:

[0051] Etching: 20ml of hydrofluoric acid solution with a mass fraction of 5% was provided, and 100mg of aluminum selenide with a fineness of 300 mesh was added to the hydrofluoric acid solution to obtain a hydrofluoric acid mixed system. Then transfer the hydrofluoric acid mixed system to 80° C. and stir for 5 hours. During the stirring process, the hydrofluoric acid etches the aluminum in the aluminum selenide, thereby obtaining the multilayer microstructure of the preliminarily exfoliated selenium. After the etching, the hydrofluoric acid mixed system was centrifuged at 10,000 rpm for 5 minutes, and the precipitate was collected after centrifugation, washed three times with deionized water, and dried after washing. This step can effectively remove the residual hydrofluoric acid, prevent the residual hydrofluoric acid from affecting the subsequent liquid phase stripping process, and also he...

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Abstract

The invention provides a method for preparing selenium nanosheets, comprising the following steps: etching: providing a hydrofluoric acid solution with a mass fraction of 5% to 20%, adding aluminum selenide to the hydrofluoric acid solution to obtain hydrogen Hydrofluoric acid mixed system, transfer the hydrofluoric acid mixed system to 50-80°C and stir for 1-5 hours, after stirring, perform primary centrifugation on the hydrofluoric acid mixed system and collect the precipitate; Add it to the dispersant, and then ultrasonically treat the dispersant with a probe for 4-24 hours. The ultrasonic power of the probe is 200-400W, and the temperature of the dispersant during the ultrasonic process of the probe does not exceed 25°C; the selenium nanosheets are collected by centrifugation: The ultrasonicated dispersant is subjected to secondary centrifugation, the supernatant is collected to obtain a selenium nanosheet dispersion, and then the selenium nanosheet dispersion is subjected to tertiary centrifugation to collect precipitates to obtain selenium nanosheets. The preparation method of the selenium nano sheet of the invention has the advantages of low cost, high output and the like.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method of selenium nanosheets. Background technique [0002] Photothermal therapy is a cancer therapy with few side effects and high efficiency developed in recent years. Its therapeutic mechanism mainly uses photothermal agents to generate local high temperature under the irradiation of near-infrared laser to kill cancer cells. Because the laser with a wavelength of 808nm has less damage to the tissue, and the absorption ability of water and protein is weak, the laser with a wavelength of 808nm can penetrate the human tissue more deeply, so the laser with this wavelength is generally selected as the light source for treatment. Two-dimensional materials are small in size and large in specific surface area, and can enter tumor cells through endocytosis. Therefore, the prospect of applying two-dimensional materials in photothermal agents is very broad. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B19/02B82Y40/00
CPCB82Y40/00C01B19/02
Inventor 张晗范涛健张家宜
Owner SHENZHEN UNIV
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