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Method for preparing two-dimensional nano-sheet materials by adopting liquid-phase stripping

A two-dimensional nano, liquid phase exfoliation technology, applied in the field of preparation of two-dimensional nanosheet materials, can solve the problems of low exfoliation efficiency, unstable nanosheets, long ultrasonic time, etc., to reduce van der Waals force and prevent recurrence Stacked, easy-to-use effects

Inactive Publication Date: 2018-05-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2016, the researchers successfully peeled off the sheet WS in water by ultrasonic method. 2 , but the exfoliated nanosheets are unstable in water, easy to stack together again by van der Waals force, and the efficiency of exfoliation is not high (Pan L., Liu Y.T., XieX.M., et al.Facile and Green Production of Impurity- Free Aqueous Solutions ofWS2 Nanosheets by Direct Exfoliation in Water[J]. Small, 2016, 12(48):6703-6713)
However, the stripping efficiency of these methods is still very low, and many require a long ultrasonic time, even up to several days

Method used

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  • Method for preparing two-dimensional nano-sheet materials by adopting liquid-phase stripping
  • Method for preparing two-dimensional nano-sheet materials by adopting liquid-phase stripping
  • Method for preparing two-dimensional nano-sheet materials by adopting liquid-phase stripping

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) At room temperature, molybdenum disulfide and epigallocatechin were added into water according to a certain proportion and mixed uniformly to obtain molybdenum disulfide and epigallocatechin concentrations of 10 mg / mL and 4 mg / L respectively. The volume is 100mL;

[0037] (2) At room temperature, the solution in step (1) was ultrasonically treated with a cell pulverizer at a power of 300W for 4 hours;

[0038] (3) At room temperature, centrifuge the ultrasonic solution in step (2) for 60 minutes at a speed of 8000 rpm, and separate the supernatant to obtain a two-dimensional nanosheet material with good dispersibility The solution is dried to obtain a two-dimensional nano sheet material powder.

[0039] The transmission electron microscopy and atomic force microscopy images of the two-dimensional nanosheet material prepared by the above method are as follows: figure 1 and figure 2 As shown, it can be seen from the figure that the prepared two-dimensional nanoshe...

Embodiment 2～4

[0041]The epigallocatechin in Example 1 was replaced successively with gallic acid, tannic acid and epigallocatechin gallate, and the rest of the conditions were consistent with Example 1. The experimental results of Examples 1-5 are shown in Table 1.

[0042] Table 1 Experimental results of molybdenum disulfide stripped by different plant polyphenols

[0043]

Embodiment 5

[0045] (1) At room temperature, add tungsten disulfide and epigallocatechin into water according to a certain proportion and mix them uniformly to obtain concentrations of tungsten disulfide and epigallocatechin of 10 mg / mL and 5 mg / L respectively. The volume is 100mL;

[0046] (2) Under room temperature conditions, the solution in step (1) is ultrasonically treated with a cell pulverizer; the ultrasonic treatment time is 4 hours, and the ultrasonic power is 300W;

[0047] (3) At room temperature, centrifuge the ultrasonic solution in step (2) for 60 minutes at a speed of 8000 rpm, and separate the supernatant to obtain a two-dimensional nanosheet material with good dispersibility The solution is dried to obtain a two-dimensional nano sheet material powder.

[0048] The experimental results are shown in Table 2.

[0049] Table 2 Experimental results of stripping tungsten disulfide in Example 5

[0050]

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Abstract

The invention discloses a method for preparing two-dimensional nano-sheet materials by adopting liquid-phase stripping. The method includes the steps of 1), adding layered three-dimensional materialsand plant polyphenol into water for even mixing to form a mixture and performing ultrasonic treatment; 2), performing centrifugal separation on the mixture subjected to ultrasonic treatment, wherein asupernatant separated is a water solution of the two-dimensional nano-sheet materials; 3), drying the water solution of the two-dimensional nano-sheet materials to obtain powder of the two-dimensional nano-sheet materials. In the method, the natural plant polyphenol is taken as an additive to assist an ultrasonic liquid phase in having the various layered three-dimensional materials into the two-dimensional nano-sheet materials, the plant polyphenol is super adhesive force and can be quickly adsorbed to surfaces of various two-dimensional nano-sheet materials, and excellent university and efficiency are achieved due to the super adhesive force.

Description

technical field [0001] The invention relates to the technical field of preparation of two-dimensional nanosheet materials, in particular to a method for preparing two-dimensional nanosheet materials by a liquid phase exfoliation method. Background technique [0002] Two-dimensional nanosheet materials are favored by people because of their excellent electrical, optical, mechanical and electrochemical properties, and have been widely used in energy storage, environmental restoration, photoelectricity, catalysis and sensors, showing unparalleled performance. In recent years, researchers have developed a series of two-dimensional sheet materials, such as graphene, boron nitride (h-BN), transition metal sulfides (MoS2, WS2, MoSe2, WSe2), graphite carbonitride (g-C3N4 ) and black phosphorus (BP), etc. These single-layer two-dimensional nanomaterials are only atomically thick, and the layers are stacked by van der Waals force to form a macroscopic three-dimensional layered materi...

Claims

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Application Information

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IPC IPC(8): C01G39/06C01G41/00C01B19/04C01B21/064C01B21/082C01B32/225C01B25/02
CPCC01G39/06C01B19/007C01B21/0605C01B21/064C01B25/02C01G41/00C01P2004/04C01P2004/20C01P2004/62C01P2004/64
Inventor 徐志康张超林福文
Owner ZHEJIANG UNIV
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