Two-dimensional tellurium nano-sheet as well as preparation method and application thereof

A tellurium nanometer and ultrasonic technology, applied in the field of two-dimensional tellurium nanosheets and its preparation, can solve the problems of restricting the development of two-dimensional functional materials and limited types of two-dimensional layered materials, and achieve excellent photoelectric detection performance, good peeling effect, The effect of the simple and easy-to-operate preparation method

Inactive Publication Date: 2018-07-24
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • 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

Method used

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  • Two-dimensional tellurium nano-sheet as well as preparation method and application thereof
  • Two-dimensional tellurium nano-sheet as well as preparation method and application thereof
  • Two-dimensional tellurium nano-sheet as well as preparation method and application thereof

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preparation example Construction

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

[0037] A tellurium raw material is provided, and the tellurium raw material is stripped by a liquid phase exfoliation method to obtain two-dimensional tellurium nanosheets, and the thickness of the two-dimensional tellurium nanosheets is 1-50 nm.

[0038] In the embodiment of the present invention, the tellurium raw material is a two-dimensional non-layered metal tellurium element, such as tellurium powder, or a tellurium block, and there is no special limitation on its size and shape, for example, it can be micron-scale or millimeter-scale blocks. The tellurium raw material can be purchased. The bandgap of the tellurium raw material is as narrow as about 0.3eV, and the bandgap of the two-dimensional tellurium nanosheets obtained after stripping is also narrower, which can be used to detect light with a lon...

Embodiment 1

[0055] A method for preparing two-dimensional tellurium nanosheets, comprising the following steps:

[0056] (1) Add 500mg of tellurium powder into 100ml of isopropanol. Then select the probe ultrasound 240W, 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 360W. Ultrasonic time is 8h. The temperature of the water bath was maintained at 10°C;

[0057] (2) After ultrasonication, centrifugation is used to obtain the required two-dimensional tellurium nanosheets. Firstly, a centrifugal force of 2000g is used for 30min. The supernatant was taken, and then the supernatant was continuously centrifuged at 12000 g for 30 min to obtain a precipitate, which was then vacuum-dried to obtain two-dimensional tellurium nanosheets.

[0058] Such as figure 1 Shown is the electron microscope topog...

Embodiment 2

[0062] A method for preparing two-dimensional tellurium nanosheets, comprising the following steps:

[0063] (1) Add 500mg of tellurium powder into 100ml of isopropanol. Then select the probe ultrasound 200W, ultrasound 15h. 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 15°C;

[0064] (2) After ultrasonication, centrifugation is used to obtain the required two-dimensional tellurium nanosheets. Firstly, the centrifugal force of 1800g is adopted, and the centrifugation is performed for 35min. The supernatant was taken, and then the supernatant was centrifuged at 15000 g for 25 minutes to obtain a precipitate, which was dried in vacuum to obtain two-dimensional tellurium nanosheets.

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Abstract

The invention provides a two-dimensional tellurium nano-sheet. The thickness of the two-dimensional tellurium nano-sheet is 1 to 50nm. The two-dimensional tellurium nano-sheet provided by the invention has good photoelectric detection performance. The invention further provides a preparation method of the two-dimensional tellurium nano-sheet; the preparation method comprises the following steps: providing a tellurium raw material; stripping the tellurium raw material by adopting a liquid-phase stripping method, so as to obtain the two-dimensional tellurium nano-sheet, wherein the thickness ofthe two-dimensional tellurium nano-sheet is 1 to 50nm. According to the two-dimensional tellurium nano-sheet and the preparation method, the two-dimensional tellurium nano-sheet is prepared from a non-laminar tellurium raw material by adopting a liquid-phase stripping method for the first time and the stripping effect is good; the two-dimensional tellurium nano-sheet can be prepared in a large scale and the cost is relatively low; the preparation method is simple and easy to operate. The invention further provides application of the two-dimensional tellurium nano-sheet to optical detectors.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a two-dimensional tellurium nanosheet and its preparation method and application. Background technique [0002] Two-dimensional materials refer to materials in which electrons can only move freely (planar motion) on the non-nanoscale in two dimensions, 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 known as "white graphite", molybdenum disulfide, silicene, germanene, black phosphorus, etc. [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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02B82Y40/00H01L31/0272H01L31/09
CPCH01L31/0272H01L31/09B82Y40/00C01B19/02B82Y30/00
Inventor 张晗谢中建
Owner SHENZHEN UNIV
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