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Method for preparing molybdenum disulfide (MoS2) nanosheet

A technology of molybdenum disulfide and nanosheets, which is applied in the fields of molybdenum sulfide, nanotechnology, nanotechnology, etc.

Inactive Publication Date: 2014-05-21
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combined use of hydrothermal and ultrasonic stripping methods to strip molybdenum disulfide has not been reported yet.

Method used

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  • Method for preparing molybdenum disulfide (MoS2) nanosheet
  • Method for preparing molybdenum disulfide (MoS2) nanosheet
  • Method for preparing molybdenum disulfide (MoS2) nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt MoS 2 Powder (99%) and lithium carbonate (analytical purity) are used as raw materials. After the two are uniformly mixed at 1 mol: 42 mol, they are placed in an autoclave containing 40 ml of benzyl alcohol and sealed under high pressure. React in a high temperature furnace at 200°C for 48 hours. After natural cooling, it is washed with acetone and alcohol, and dried in vacuum to obtain an intermediate product. Take 0.2g of the intermediate product and put it in a mixture of 20ml DMF (dimethylformamide) and 10ml water, and ultrasonicate for 12h. The resulting dispersion is centrifuged for 30 minutes in a centrifuge with a rotating speed of 600rpm (revolutions per minute), and then clear. The liquid was centrifuged at 6000 rpm for 6 minutes, the obtained product was washed twice with 3% HCl, washed with ionized water to neutrality, and the final product was washed with alcohol several times, and dried in a vacuum drying oven to obtain the product. The transmission ...

Embodiment 2

[0024] Adopt MoS 2 Powder (99%) and lithium carbonate (analytical purity) are used as raw materials. After the two are uniformly mixed at 1 mol: 42 mol, they are placed in an autoclave containing 40 ml of benzyl alcohol and sealed under high pressure. React for 48h in a high temperature furnace at 200°C. After natural cooling, it is washed with acetone and alcohol, and dried in vacuum to obtain an intermediate product. Take 0.55g of the intermediate product and put it into a mixture of 20ml dimethylformamide and 10ml water, ultrasonicate for 12h, and centrifuge the obtained dispersion with a centrifuge at 600rpm for 30 minutes, then take the clear liquid and centrifuge at 6000rpm for 6 minutes , The obtained product was washed twice with 3% HCl, washed with ionized water to neutrality, and the final product was washed with alcohol several times, and dried in a vacuum drying oven to obtain the product. Its X-ray diffraction pattern is as figure 2 .

Embodiment 3

[0026] Adopt MoS 2 Powder (99%) and lithium carbonate (analytical purity) are used as raw materials. After the two are uniformly mixed at 1mol: 42mol, they are put into an autoclave containing 40ml benzyl alcohol and sealed under high pressure. React in a high temperature furnace at 200°C for 48 hours. After natural cooling, it is washed twice with acetone, twice with hydrochloric acid, then washed with deionized water to neutrality, finally washed with alcohol, and dried in vacuum to obtain the intermediate product. Take 0.04277g of the intermediate product into a mixture of 20ml of dimethylformamide and 10ml of water, and sonicate for 12h. Centrifuge at 500 rpm for 45 minutes, then take the clear liquid and centrifuge at 8000 rpm for 6 minutes. The product obtained is washed with deionized water several times, and finally dried with alcohol in a vacuum to obtain the product. The TEM picture is as follows image 3 , Figure 4 .

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Abstract

The invention discloses a method for preparing a molybdenum disulfide (MoS2) nanosheet by two steps, namely a hydrothermal method and a liquid phase ultrasonic stripping method. The method disclosed by the invention is realized by the following technological steps: evenly mixing the bought MoS2 powder with lithium carbonate according to the molar ratio of 1: 42, putting the mixture into a high pressure kettle filled with 40ml of benzyl alcohol, and sealing; maintaining for 48 hours at the temperature of 200 DEG C; carrying out natural cooling and vacuum drying to obtain an intermediate product; putting 0.2-0.6g of intermediate product into mixed liquid of 20ml of dimethyl formamide and 10ml of water, and carrying out ultrasonic dispersion for 12 hours; centrifuging the obtained dispersed liquid for 30-45 minutes at the speed of 500-600rpm (revolutions per minute), and then centrifuging the supernatant liquid for 6 minutes at the speed of 6000-8000rpm; cleaning the product by 3% HCl for twice, and then cleaning the product by deionized water until the product is neutral; and finally, carrying out vacuum drying on the product to obtain the nano MoS2 sheet. The MoS2 nanosheet is stripped by the method disclosed by the invention. The method has the characteristics of being simple, easy to realize and popularize and suitable for large-scale industrial production.

Description

Technical field [0001] The invention belongs to the field of nanostructure preparation, and is a method for ultrasonically peeling a bulk material into a nanosheet in a liquid phase. Background technique [0002] MoS 2 It is a direct gap semiconductor with weak van der Waals forces between layers. It belongs to the hexagonal layered structure. It has high application prospects in optoelectronic devices. It can also be a new type of material for making transistors (such as sensors, LEDs, Solar cells, etc.). Compared with graphene, which is also a two-dimensional material, molybdenum disulfide has an energy band gap of 1.8 eV, while graphene does not have an energy band gap. Therefore, molybdenum disulfide may have a broader application space in the field of nano-transistors. Nano MoS 2 The performance is better than ordinary MoS 2 It is more excellent, can be used as a catalyst, and the electron mobility of a single-layer molybdenum disulfide transistor is higher. [0003] Scienti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06B82Y40/00B82Y30/00
Inventor 简基康李燕吴荣
Owner XINJIANG UNIVERSITY
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