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A kind of preparation method of ultrathin tmd two-dimensional nanosheet

A nanosheet, organic alkali metal technology, applied in chemical instruments and methods, binary selenium/tellurium compounds, inorganic chemistry, etc. Interference of sample properties, overcoming the effects of expensive preparation and protection of bonding forces

Active Publication Date: 2020-10-27
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have their own shortcomings. For example, mechanical exfoliation is difficult to transfer, and the yield is low, which is not suitable for large-scale production. Electrochemical exfoliation often changes the electrical properties of the sample. Traditional liquid phase exfoliation requires high-power ultrasonic treatment to obtain nanosheets. The size is small, the chemical vapor deposition method requires high temperature and explosive dangerous conditions and the technology is not yet mature, the output is low and it is difficult to adapt to large-scale production, the hydrothermal method introduces more defects, and the crystallinity of the product is poor

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  • A kind of preparation method of ultrathin tmd two-dimensional nanosheet
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  • A kind of preparation method of ultrathin tmd two-dimensional nanosheet

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preparation example Construction

[0040] The invention provides a kind of preparation method of TMD nano sheet, comprises the following steps:

[0041] A) under normal temperature conditions, after the TMD layered crystal, the organic alkali metal compound and n-hexane are mixed and reacted, an intermediate is obtained;

[0042] B) putting the intermediate obtained in the above steps into a solvent for peeling off to obtain TMD nanosheets.

[0043]In the invention, the intermediate is obtained by mixing and reacting TMD layered crystals, organic alkali metal compounds and n-hexane under normal temperature conditions.

[0044] The present invention has no special restrictions on the normal temperature conditions, and the normal temperature range well known to those skilled in the art can be used. Those skilled in the art can select and adjust according to the actual reaction conditions, raw material conditions and product requirements. The normal temperature conditions of the present invention, Compared with t...

Embodiment 1

[0073] Large-sized monolayer TaS 2 Exfoliation Preparation of Nanosheets

[0074] Add 100mg TaS to a 200ml three-necked bottle 2 Add the single wafer to 40ml of n-hexane, then add 20ml of butyllithium cyclohexane solution (25%), stir vigorously, and react under sealed room temperature for 20 hours, take out the precipitated sample to obtain the intercalation sample; The sample is placed in a 1:2 mixture of water and ethanol, and a well-dispersed large-size single-layer nanosheet slurry can be obtained by vigorous shaking. Prolonging the shaking time makes the utilization rate of raw materials reach 100%, and finally obtains a high-yield single-layer Large size TaS 2 Nanosheets.

[0075] To the TaS prepared by Example 1 of the present invention 2 Nanosheets were characterized and tested.

[0076] TaS prepared by Example 1 of the present invention 2 The thickness of the nanosheet is 0.87nm, and the size of the sheet diameter is 25um.

[0077] see figure 1 , figure 1 For...

Embodiment 2

[0084] Large size single layer WS 2 Exfoliation Preparation of Nanosheets

[0085] Add 100mg WS to a 200ml three-neck bottle 2 Add the single wafer to 40ml of n-hexane, then add 30ml of butyllithium cyclohexane solution (25%), stir vigorously, and react under sealed room temperature for 15 hours, take out the precipitated sample, and then obtain the intercalation sample; The sample is placed in a 1:5 mixture of water and acetone, and a well-dispersed large-size single-layer nanosheet slurry can be obtained by vigorous shaking. Prolong the shaking time so that the utilization rate of raw materials can reach 100%, and finally a high-yield single-layer nanosheet can be obtained. Large size MoS 2 Nanosheets.

[0086] To the WS prepared by the embodiment of the present invention 2 2 Nanosheets were characterized and tested.

[0087] see Figure 5 , Figure 5 For the WS prepared in Example 2 of the present invention 2 Transmission electron micrograph of the nanosheets. Depe...

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Abstract

The invention provides a preparation method of a TMD (transition-metal dichalcogenide) nanosheet. The preparation method comprises the following steps: firstly, under a normal-temperature condition, mixing TMD lamellar crystals, an organic alkali metal compound and normal hexane for reaction to obtain an intermediate, and finally, putting the intermediate obtained in the former step into a solventfor stripping, so as to obtain the TMD nanosheet. According to the preparation method disclosed by the invention, under the normal-temperature condition, the organic alkali metal compound is adoptedfor intercalation, so that the interlaminar space is enlarged; the surface tension of the solvent is fully used for counteracting the interlaminar Van der Waals force of the TMD material, so that theintralaminar bonding force is protected. Therefore, the ultralarge-sized ultrathin TMD nanosheet is obtained. The preparation method provided by the invention has the advantages of simple process, high yield and batch production, and completely overcomes the shortcomings of extremely high preparation cost, interference to sample nature and the like in the conventional method.

Description

technical field [0001] The invention relates to the technical field of exfoliation preparation of two-dimensional nanomaterials, relates to a preparation method of TMD two-dimensional nanosheets, and in particular to an intercalation-liquid phase exfoliation method of ultra-large and ultrathin TMD two-dimensional nanosheets and its application. Background technique [0002] In recent years, nanomaterials have developed vigorously. Nanostructured materials are referred to as nanomaterials, which refer to the size of their structural units ranging from 1 to 100 nanometers. Since its size is close to the coherence length of electrons, its properties change greatly due to self-organization brought about by strong coherence. Therefore, the properties exhibited by it, such as melting point, magnetism, optics, thermal conductivity, electrical conductivity, etc., are often different from those exhibited by the substance in its bulk state. Nanosheets are a typical two-dimensional na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G35/00C01G41/00C01B19/04
CPCC01B19/04C01G35/00C01G41/00C01P2002/82C01P2004/02C01P2004/04C01P2004/20C01P2004/61C01P2006/40C01P2006/42C01P2006/60
Inventor 吴长征吴佳静彭晶谢毅
Owner UNIV OF SCI & TECH OF CHINA
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