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Ultra-thin two-dimensional layered material nanosheet and preparing method thereof

A two-dimensional layered and nanosheet technology, applied in the field of two-dimensional nanomaterials, can solve the problems of low yield of two-dimensional layered material nanosheets, difficulty in obtaining high-concentration suspensions, and restrictions on practical applications, and achieve good results. The effect of industrial application prospects, less demand for raw materials and equipment types, and convenient operation

Active Publication Date: 2018-05-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the yield of two-dimensional layered material nanosheets prepared by this method is low and is prone to agglomeration in solution, it is difficult to obtain a high-concentration suspension, and few of the obtained two-dimensional layered material nanosheets are large The single-layer or few-layer structure seriously restricts its practical application

Method used

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  • Ultra-thin two-dimensional layered material nanosheet and preparing method thereof
  • Ultra-thin two-dimensional layered material nanosheet and preparing method thereof
  • Ultra-thin two-dimensional layered material nanosheet and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] ①. Weigh 0.2g of high-purity graphite initial powder into a 50mL centrifuge tube, put the centrifuge tube into an insulated bucket filled with liquid nitrogen and inject 40mL of liquid nitrogen, and place it in the liquid nitrogen insulated bucket Medium heat preservation for 0.5 hours;

[0028] ②. Take out the centrifuge tube, and immediately disperse the above-mentioned graphite powder in 1000mL of ethanol and water mixed solvent with a volume ratio of 1:1 after the liquid nitrogen is completely volatilized, and perform ultrasonic treatment for 0.5 hours with an ultrasonic power of 120W to obtain graphene nanosheets .

[0029] see figure 1 The AFM image of the graphene nanosheets shown, the graphene nanosheets prepared in this embodiment have a single-layer or few-layer structure, with a thickness of 0.8-1.6 nm and a size of 0.5-2 μm.

Embodiment 2

[0031] ①. Weigh 0.4g of high-purity graphite initial powder into a 50mL centrifuge tube, put the centrifuge tube into an insulated bucket filled with liquid nitrogen and inject 40mL of liquid nitrogen, and place it in the liquid nitrogen insulated bucket Medium heat preservation for 1 hour;

[0032] ②. Take out the centrifuge tube, and immediately disperse the above graphite powder in 1000mL isopropanol and water mixed solvent with a volume ratio of 1:1 after the liquid nitrogen is completely volatilized, and perform ultrasonic treatment for 1 hour, with an ultrasonic power of 150W, to obtain graphene nanoparticles. piece.

[0033] see figure 2 The AFM image of the graphene nanosheets shown, the graphene nanosheets prepared in this embodiment have a single-layer or few-layer structure, with a thickness of 1-1.7 nm and a size of 1-5 μm.

Embodiment 3

[0035] ①. Weigh 0.8g of high-purity molybdenum disulfide initial powder into a 50mL centrifuge tube, put the centrifuge tube into an insulated bucket filled with liquid argon and inject 40mL of liquid argon, and place it in the liquid argon Keep warm for 2 hours in an insulated bucket;

[0036] ②. Take out the centrifuge tube, and immediately after the liquid argon is completely volatilized, disperse the molybdenum disulfide powder in 1000mL of a mixed solvent of ethylene glycol and water with a volume ratio of 7:3, and perform ultrasonic treatment for 1.5 hours with an ultrasonic power of 180W to obtain two Molybdenum sulfide nanosheets.

[0037] see image 3 The AFM images of molybdenum disulfide nanosheets are shown. The molybdenum disulfide nanosheets prepared in this example have a single-layer or few-layer structure, with a thickness of 1.5-2.5 nm and a size of 1-5 μm.

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Abstract

The invention discloses an ultra-thin two-dimensional layered material nanosheet and a preparing method thereof. The nanosheet has a single layer or few layers and has the nanometer thickness of 0.8-2.5 nm and the size of 0.5-10 micron. The preparing method of the nanosheet specifically includes the following steps of firstly, putting high-purity two-dimensional layered material initial powder ina centrifugal tube, injecting liquid gas into the centrifugal tube, and putting the opened centrifugal tube in a thermal insulation barrel containing the liquid gas for thermal insulation for 0.5-6 hours; secondly, taking out the centrifugal tube, instantly dispersing the powder in a solvent after the liquid gas completely volatiles, and conducting ultrasonic treatment for 0.5-4 hours at the ultrasonic powder of 120-300 W to prepare the ultra-thin two-dimensional layered material nanosheet. The nanosheet is simple in process and low in cost, the high-efficiency preparation of the typical two-dimensional layered material nanosheet of graphene, molybdenum disulfide, boron hexahydrate and the like can be achieved.

Description

technical field [0001] The invention relates to the technical field of two-dimensional nanomaterials, in particular to an ultrathin two-dimensional layered material nanosheet and a preparation method thereof. Background technique [0002] In recent years, two-dimensional layered materials such as graphene, transition metal sulfides, boron nitride, and black phosphorus have attracted extensive attention and research because of their excellent electronic, thermal, optical, and mechanical properties. At present, the preparation methods of two-dimensional layered material nanosheets are mainly divided into bottom-up and top-down processes, including chemical vapor deposition, mechanical exfoliation, (electro)chemical exfoliation and ultrasonic liquid phase exfoliation. . Although these methods can prepare single-layer or few-layer 2D layered material nanosheets, there are still inevitable deficiencies for large-scale production of 2D layered material nanosheets, such as chemica...

Claims

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Application Information

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IPC IPC(8): C01B32/19B82Y40/00C01G39/06C01B21/064C01B25/02
CPCB82Y40/00C01B21/0648C01B25/02C01B2204/04C01B2204/32C01G39/06C01P2004/04C01P2004/64C01P2006/80
Inventor 王岩杨皖分张剑芳吴玉程崔接武舒霞张勇秦永强郑红梅
Owner HEFEI UNIV OF TECH
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