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Method for preparing two-dimensional nano material under assistance of easily decomposed salt

A two-dimensional nanomaterial, easy to decompose technology, applied in the preparation of two-dimensional nanomaterials by liquid phase shear exfoliation, in the field of two-dimensional nanomaterial preparation, can solve the problems of increased process cost, low yield, unfavorable industrial production, etc., to achieve The effect of high quality and few defects

Active Publication Date: 2019-12-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are endless methods for preparing two-dimensional nanomaterials by liquid phase exfoliation, the current yield is relatively low, and pretreatment is usually required to increase the yield, such as microwave pretreatment, dry ice-assisted ball milling, etc., which often require special environments or expensive additives. Lead to increased process costs, which is not conducive to industrial production

Method used

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  • Method for preparing two-dimensional nano material under assistance of easily decomposed salt
  • Method for preparing two-dimensional nano material under assistance of easily decomposed salt
  • Method for preparing two-dimensional nano material under assistance of easily decomposed salt

Examples

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Effect test

Embodiment 1

[0025] Prepare molybdenum disulfide nanosheets;

[0026] Mix the molybdenum disulfide and ammonium bicarbonate in the block at a mass ratio of 1:2, the ball milling speed is 320rpm, and the ball milling time is 6h;

[0027] The ball-milled powder is annealed in a tube furnace, and under the protection of an inert atmosphere, the temperature is raised to 200°C at a rate of 10°C / min, and then kept for 2 hours to decompose the unintercalated ammonium bicarbonate;

[0028] The pre-intercalation powder was redispersed into NMP organic solvent at a concentration of 30 mg / mL. After ultrasonication for 1 h, the suspension was centrifuged, and the supernatant was taken to obtain a molybdenum disulfide nanosheet dispersion. The concentration of the molybdenum disulfide nanosheet dispersion is 11.1mg / mL, the average lateral size is about 64nm, the number of layers is less than 10, and the yield is 37%. The morphology of the obtained molybdenum disulfide nanosheets, such as figure 1 sho...

Embodiment 2

[0030] The difference between Example 2 and Example 1 is that the bulk molybdenum disulfide and ammonium chloride are mixed at a mass ratio of 1:2, and the rest of the process is the same. After ultrasonic treatment, the yield is 20%.

Embodiment 3

[0032] The difference between Example 3 and Example 1 is that the high-shear mixer was peeled off for 2 hours, the rotating speed was 8000rpm / min, and the rest of the process was the same. After ultrasonic treatment, the yield was 30%;

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Abstract

The invention discloses a method for preparing a two-dimensional nano material under assistance of easily decomposed salt, and belongs to the technical field of preparation of two-dimensional nano materials. The method comprises the following steps: mixing and ball-milling a layered material (graphite, molybdenum disulfide and the like) and low-temperature easily-decomposed salt, annealing to obtain pre-intercalation powder, preparing the pre-intercalation powder into dispersion liquid, and carrying out ultrasonic or high-shear stripping to obtain the two-dimensional nano material of which thenumber of layers is less than ten. The easily decomposed salt is used as a stripping aid, so that the layered material is favorably crushed and stacking of the layers is prevented, in addition, partof the easily decomposed salt can be inserted into spaces among the layers of the layered powder, shearing stripping is facilitated, the number of the layers of obtained two-dimensional nano-sheets issmall, the size of the nano-sheets is controllable, and the yield is high. The method has the advantages of high stripping efficiency, simplicity in preparation, industrial application prospect and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of two-dimensional nanometer materials, and in particular relates to the application in the field of preparation of two-dimensional nanometer materials by liquid phase shear exfoliation. Background technique [0002] Compared with bulk materials, nanomaterials have effects such as small size, surface and interface, quantum size, and macroscopic quantum tunneling. It is precisely because of these special properties and laws that nanomaterials are widely used in optics, magnetism, electronics, biology and other fields. It has broad application prospects. Since 2004, Novoselov et al. have prepared graphene by micromechanical exfoliation, confirming that two-dimensional nanomaterials can exist stably under ambient conditions. This discovery broke the traditional cognition of two-dimensional nanomaterials and prompted more and more researchers to study the preparation, properties and applications ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06C01B32/19B82Y40/00
CPCB82Y40/00C01G39/06C01P2004/24C01B32/19
Inventor 毋伟李月微王武尹翔鹭
Owner BEIJING UNIV OF CHEM TECH