Preparation method for molybdenum disulfide quantum dot

A technology of molybdenum disulfide and quantum dots, applied in the direction of molybdenum sulfide, etc., can solve the problems of large environmental pollution, time-consuming, complicated preparation process, etc., and achieve the effect of simple equipment, low production cost and simple process

Active Publication Date: 2016-01-27
TAIYUAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing molybdenum disulfide quantum dots, which is used to solve the problems of complex preparation process, large environmental pollution, and long time consumption of molybdenum disulfide quantum dots in the prior art

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  • Preparation method for molybdenum disulfide quantum dot

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preparation example Construction

[0025] A method for preparing molybdenum disulfide quantum dots, comprising the following steps: (1) dispersing molybdenum disulfide powder in absolute ethanol, the concentration of the solution prepared by dispersing the molybdenum disulfide powder in absolute ethanol is 0.5 -10mg / mL (0.5mg / mL, 1.0mg / mL, 2.0mg / mL, 3.0mg / mL, 4.0mg / mL, 5.0mg / mL, 6.0mg / mL, 7.0mg / mL, 8.0mg / mL can be selected mL, 9.0mg / mL, 10mg / mL); add sodium hydroxide to the solution, the amount of sodium hydroxide added is 0.5-3mg / mL (0.5mg / mL, 1.0mg / mL, 1.5mg / mL, 2.0mg / mL, 2.5mg / mL, 3.0mg / mL), ultrasonically mixed to obtain a mixed solution;

[0026] (2) Transfer the mixed solution described in step (1) to the reactor, seal it, and react in an oven at 100-200°C (100°C, 120°C, 140°C, 160°C, 180°C, 200°C) for 3 -24h (3h, 6h, 9h, 12h, 15h, 18h, 21h, 24h can be selected), naturally cool to room temperature, and collect the filtrate after filtration;

[0027] (3) Dialyze the filtrate obtained in step (2) to neutr...

Embodiment 1

[0030] Disperse 30mg of molybdenum disulfide powder in 30mL of absolute ethanol, add 45mg of sodium hydroxide, mix ultrasonically for 1min, transfer the mixed solution to a reaction kettle, raise the temperature to 180°C for 12h, and naturally cool to room temperature. The product is filtered and separated by a 0.22 μm microporous membrane to obtain a yellow solution, and the obtained solution is transferred to a dialysis bag with a molecular weight cut-off of 1000D and dialyzed to neutrality to remove small impurities, and then freeze-dried at -40°C to obtain molybdenum disulfide quantum dots.

[0031] figure 1 and substantive examination reference figure 1 The pictures of the molybdenum disulfide quantum dot aqueous solution prepared in Example 1 under sunlight and ultraviolet light irradiation. referenced by substantive examination figure 1 It can be seen that the molybdenum disulfide quantum dots obtained in this example exhibit strong blue fluorescence under the irradi...

Embodiment 2

[0033] Disperse 60mg of molybdenum disulfide powder in 30mL of absolute ethanol, add 30mg of sodium hydroxide, mix ultrasonically for 1min, transfer the mixed solution to a reaction kettle, raise the temperature to 200°C for 6h, and naturally cool to room temperature. The product is filtered and separated by a 0.22 μm microporous membrane to obtain a yellow solution, and the obtained solution is transferred to a dialysis bag with a molecular weight cut-off of 1000D and dialyzed to neutrality to remove small impurities, and then freeze-dried at -40°C to obtain molybdenum disulfide quantum dots.

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Abstract

The invention discloses a preparation method for a molybdenum disulfide quantum dot. The method comprises the following steps: (1) dispersing molybdenum disulfide powder in absolute ethyl alcohol, adding 0.5 to 3mg / mL of sodium hydroxide into the solution, and performing ultrasonic and uniform mixing to obtain a mixed solution; (2) transferring the mixed solution into a reaction kettle, sealing the reaction kettle, reacting for 3 to 24h in an oven of which the temperature is 100 to 200 DEG C, performing natural cooling until the temperature is room temperature, performing filtration, and then collecting obtained filter liquid; (3) dialyzing the filter liquid obtained in the step (2) in a dialysis bag to be neutral, removing small impurity molecules, and performing drying to obtain the molybdenum disulfide quantum dot. The preparation method for the molybdenum disulfide quantum dot is simple in operation, environmentally-friendly and low in cost, process conditions are easy to realize, and the prepared molybdenum disulfide quantum dot is excellent in dispersity, water solubility and fluorescence. The molybdenum disulfide quantum dot has a potential application value in terms of photo-electronic devices, lithium ion batteries, biological imaging, photo-electronic catalysis and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, in particular to a preparation method of molybdenum disulfide quantum dots. Background technique [0002] Graphene-like materials are a class of inorganic compounds with a layered crystal structure similar to graphite. Due to their unique electronic properties and large specific surface area, they can be widely used in many fields such as physics, chemistry, materials, and electronics. Studies have shown that graphene-like compounds have many properties similar to or even superior to graphene, the typical representative of which is molybdenum disulfide. [0003] Molybdenum disulfide is a typical transition metal two-dimensional layered sulfide. A single layer of molybdenum disulfide is composed of S-Mo-S atomic layers in a covalent bond, and the layers are bonded by weak van der Waals forces. . Unlike graphene, which has a two-dimensional layered structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06
Inventor 王晓敏刘青青
Owner TAIYUAN UNIV OF TECH
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