Two-dimensional selenium nanosheet as well as preparation method and application thereof

A selenium nanometer and amorphous selenium technology, which is applied in the field of two-dimensional selenium nanosheets and their preparation, can solve the problems of restricting the development of two-dimensional functional materials, limited types of two-dimensional layered materials, etc., and achieves good photodetection performance and peeling effect. The effect of good, excellent light detection performance

Inactive Publication Date: 2018-11-13
SHENZHEN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But the types of these 2D layered materials are limited, thus this greatly limits the development of 2D functional materials

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  • Two-dimensional selenium nanosheet as well as preparation method and application thereof
  • Two-dimensional selenium nanosheet as well as preparation method and application thereof
  • Two-dimensional selenium nanosheet as well as preparation method and application thereof

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[0036] The second aspect of the embodiments of the present invention provides a method for preparing two-dimensional selenium nanosheets, comprising the following steps:

[0037] An amorphous selenium raw material is provided, and the selenium raw material is stripped by a liquid phase stripping method to obtain a two-dimensional selenium nanosheet, and the two-dimensional selenium nanosheet has an amorphous structure.

[0038] In the embodiment of the present invention, the amorphous selenium raw material is an amorphous and non-layered selenium element, and its size and shape are not particularly limited. For example, it can be selenium powder, or it can be a selenium block, such as micron or millimeter Grade blocks, specifically, the selenium raw material is selenium grains with a diameter of several millimeters. The selenium raw material can be purchased.

[0039] In the embodiment of the present invention, the liquid phase stripping method specifically includes the follo...

Embodiment 1

[0055] A preparation method of two-dimensional selenium nanosheets, comprising the following steps:

[0056] (1) Add 500 mg of amorphous selenium particles into 100 mL of isopropanol. Then select the probe ultrasound 200W, ultrasound 10h. The ultrasonic on / off time was selected as 2 / 4s, and the ultrasonic was performed in an ice bath environment. After the probe is sonicated, the water bath is then used for sonication. The ultrasonic power of the water bath is 300W. Ultrasonic time is 8h. The temperature of the water bath was maintained at 10°C;

[0057] (2) Centrifuge after ultrasonication. Firstly, a centrifugal force of 2 kg is used for centrifugation for 30 minutes. Take the supernatant, and then continue to centrifuge the supernatant with a centrifugal force of 10 kg for 30 minutes to obtain a precipitate, and obtain the two-dimensional selenium nanosheets after vacuum drying.

[0058] figure 1 It is an electron microscope topography image of the two-dimensional s...

Embodiment 2

[0061] A preparation method of two-dimensional selenium nanosheets, comprising the following steps:

[0062] (1) Add 500 mg of amorphous selenium particles to 100 mL of N-methylpyrrolidone. Then select the probe ultrasound 200W, ultrasound 12h. The ultrasonic on / off time was selected as 2 / 4s, and the ultrasonic was performed in an ice bath environment. After the probe is sonicated, the water bath is then used for sonication. The ultrasonic power of the water bath is 300W. Ultrasonic time is 10h. The temperature of the water bath was maintained at 10°C;

[0063] (2) Centrifuge after ultrasonication. Firstly, a centrifugal force of 1.8 kg is used, and the centrifugation is performed for 35 minutes. Take the supernatant, and then continue to centrifuge the supernatant with a centrifugal force of 10 kg for 25 minutes to obtain a precipitate, and obtain the two-dimensional selenium nanosheets after vacuum drying.

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Abstract

The invention provides a two-dimensional selenium nanosheet. The two-dimensional selenium nanosheet is an amorphous structure. The two-dimensional selenium nanosheet is narrower in band gap, wider inresponse spectrum, better in stability and excellent in optical detection performance at the same time. The invention also provides a preparation method of the two-dimensional selenium nanosheet. Themethod comprises the following steps: providing an amorphous selenium raw material, peeling the selenium raw material by using a liquid-phase peeling method to obtain the two-dimensional selenium nanosheet. The liquid-phase peeling method is firstly used for preparing the two-dimensional selenium nanosheet from the non-layered selenium raw material; the peeling effect is good; the two-dimensionalselenium nanosheet can be prepared in large scale; the cost is lower; the preparation method is simple and is easy to operate. The invention also provides application of the two-dimensional selenium nanosheet to optical detectors.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a two-dimensional selenium nanosheet and its preparation method and application. Background technique [0002] Two-dimensional materials refer to materials in which electrons can only move freely in two dimensions (planar motion), such as nanofilms, superlattices, and quantum wells. Two-dimensional materials were proposed in 2004 when the Geim group at the University of Manchester successfully isolated a single atomic layer of graphite material - graphene. These include boron nitride, molybdenum disulfide, silicene, germanene and black phosphorus, known as "white graphite". [0003] The two-dimensional materials mentioned above are all layered materials, that is, they are composed of strong chemical bonds within the layers and weak van der Waals forces between the layers. Because it can be easily exfoliated into two-dimensional materials by mechanical exfoliation method and liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02B82Y40/00
CPCB82Y40/00C01B19/02
Inventor 张晗谢中建
Owner SHENZHEN UNIV
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