Preparation method of stratified molybdenum disulfide nano material

A technology of molybdenum disulfide and nanomaterials, which is applied in the direction of molybdenum sulfide, nanotechnology, nanotechnology, etc., can solve the problems of limiting production and achieve the effects of low risk, high stripping rate and good physical properties

Inactive Publication Date: 2015-04-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-pressure cold and hot gas circulation convection has special requirements on temperature and pressure. The temperature difference is 200°C and it needs to be carried out in a closed container, which limits the output.

Method used

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  • Preparation method of stratified molybdenum disulfide nano material
  • Preparation method of stratified molybdenum disulfide nano material
  • Preparation method of stratified molybdenum disulfide nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 100g of molybdenum disulfide block raw material, add it to a 1L beaker, pour 1L of stripping solvent N-methylpyrrolidone (NMP), and make a molybdenum disulfide dispersion with a concentration of 100g / L.

[0033] Among them, the choice of stripping solvent is based on the difference between its surface tension and the surface tension of molybdenum disulfide. The smaller the difference, the more it can achieve the purpose of stripping single-layer and few-layer molybdenum disulfide nanosheets. Therefore, the surface tension range of the stripping solvent is required to be within 30-50mJ / m measured at 25°C 2 . The surface tension of the N-methylpyrrolidone of the present embodiment is 40mJ / m 2 (25°C), very suitable for the application of the present invention.

[0034] (2) Put the shearing head of the high-shear emulsifier into the molybdenum disulfide dispersion, gradually adjust the rotor speed to 1000rpm, and carry out hydraulic shearing treatment on the mol...

Embodiment 2

[0038] (1) Weigh 1g of molybdenum disulfide block raw material, add it to a 1L beaker, pour 1L of stripping solvent dimethyl sulfoxide (DMSO), the surface tension is about 43.6mJ / m 2 (25°C) to prepare a molybdenum disulfide dispersion with a concentration of 1g / L.

[0039](2) Put the shearing head of the high-shear emulsifier into the molybdenum disulfide dispersion, gradually adjust the rotor speed to 7500rpm, and carry out hydraulic shearing treatment on the molybdenum disulfide for 60 minutes. During the shearing process, The dispersion liquid was kept at 20°C.

[0040] (3) Centrifuge the molybdenum disulfide dispersion after hydraulic shearing, the centrifugal speed is 2000rpm, and the centrifugation time is 120min. After centrifugation, the unstripped molybdenum disulfide precipitate was removed, and the upper suspension was collected for filtration. The filter membrane was a polytetrafluoroethylene membrane (PTFE) with a diameter of 50 mm and a pore size of 0.22 μm, whi...

Embodiment 3

[0043] (1) Weigh 10g of molybdenum disulfide block raw material, add it to a 1L beaker, pour N,N-dimethylformamide (DMF), the surface tension is about 37mJ / m 2 (25°C) to prepare a molybdenum disulfide dispersion with a concentration of 10g / L.

[0044] (2) Put the shearing head of the high-shear emulsifier into the molybdenum disulfide dispersion, gradually adjust the rotor speed to 4500rpm, and carry out hydraulic shearing treatment on the molybdenum disulfide for 50 minutes. During the shearing process, The dispersion liquid was kept at 30°C.

[0045] (3) Centrifuge the molybdenum disulfide dispersion liquid after hydraulic shearing, the centrifugation speed is 1000rpm, and the centrifugation time is 60min. After centrifugation, remove the unstripped molybdenum disulfide precipitate, collect the upper suspension and filter it. The filter membrane is a polytetrafluoroethylene membrane (PTFE) with a diameter of 50 mm and a pore size of 0.22 μm, which is used to remove the stri...

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Abstract

The invention provides a preparation method of a stratified molybdenum disulfide nano material. The preparation method comprises the following steps: adding molybdenum disulfide blocks to a container and adding a stripping solvent to prepare a molybdenum disulfide dispersion; performing hydraulic shearing treatment on molybdenum disulfide dispersion by use of a high-shear emulsifying machine; and centrifuging the hydraulically sheared molybdenum disulfide dispersion, filtering the centrifuged top suspension and drying in vacuum to obtain stratified molybdenum disulfide nanosheets. According to the preparation method of the stratified molybdenum disulfide nano material, the molybdenum disulfide blocks are under a strong combined action in a narrow gap between a stator and a rotor to arouse horizontal dislocation and slippage motion of crystal faces between the molybdenum disulfide layers, and therefore, the molybdenum disulfide is stripped, and finally, stable single-layer or few-layer molybdenum disulfide sheets are obtained; the preparation method is a pure physical method, and is simple in process, low in cost, small in danger, high in stripping ratio, green and environment-friendly; the prepared stratified molybdenum disulfide nanosheets are kept excellent in physical properties and suitable for large-scale industrial production after a pilot plant test.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for directly exfoliating molybdenum disulfide blocks to prepare layered molybdenum disulfide nanometer materials. Background technique [0002] Molybdenum disulfide, as a transition metal disulfide, is a semiconductor material with a layered structure, showing good semiconductor, metal and even superconducting properties. Molybdenum disulfide bulk material is an indirect bandgap semiconductor with a bandgap of 1.2eV, and its physical properties change significantly with decreasing thickness, especially when its thickness is reduced to a few molecular layers, monolayer Molybdenum disulfide has become a direct bandgap semiconductor, and its bandgap increases to 1.9eV, and because of its electronic properties and high specific surface area, it shows good electrical, optical and mechanical properties, and is widely used in lubrication, sensing, and catalysis. , energy st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06B82Y30/00B82Y40/00
Inventor 陈远富郑斌杰刘兴钊李萍剑戚飞张万里
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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