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Preparation method for single-layer molybdenum disulfide nanosheets

A single-layer molybdenum disulfide, molybdenum disulfide technology, applied in the directions of molybdenum sulfide, nanotechnology, bulk chemical production, etc., can solve the problems of long time consumption, low yield, inability to prepare nanosheets on a large scale and high efficiency, etc. Achieve the effect of short time consumption, high yield, and weakening of interlayer van der Waals forces

Pending Publication Date: 2017-10-13
深圳理大科技产业有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The invention provides a method for preparing single-layer molybdenum disulfide nanosheets, which solves the problems of low yield, long time consumption, and inability to prepare nanosheets on a large scale and with high efficiency in the existing method for preparing molybdenum disulfide quantum dots

Method used

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  • Preparation method for single-layer molybdenum disulfide nanosheets

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Embodiment 1

[0032] A preparation method of single-layer molybdenum disulfide nanosheets, comprising the steps of:

[0033] (1) 250 mg of molybdenum disulfide powder with a particle size of less than 2 μm, 100 mg of chitosan powder, 1 g of 1-butyl-3-methylimidazolium hexafluorophosphate and 10 mL of N-methylpyrrolidone were uniformly mixed and transferred to a closed glass container, obtain the first dispersion;

[0034] (2) Place the glass container in an ultrasonic cleaner, and after processing for 2 hours under the condition of 120W power, centrifuge the treated liquid for 15 minutes at 12000 rpm to collect the precipitate;

[0035] (3) Disperse the precipitate in 0.5% acetic acid solution, centrifuge at 12000 rpm for 15 minutes and collect the precipitate, repeat twice;

[0036] (4) Disperse the precipitate in deionized water, centrifuge at 4000 rpm for 30 minutes, collect 50 mL of the supernatant to obtain a single-layer molybdenum disulfide nanosheet solution, and disulfide disulfid...

Embodiment 2

[0039] A preparation method of single-layer molybdenum disulfide nanosheets, comprising the steps of:

[0040] (1) 200mg of molybdenum disulfide powder with a particle size of less than 2 μm, 90mg of chitosan powder, 1.1g of 1-butyl-3-methylimidazolium hexafluorophosphate and 12mL of N,N-dimethylformamide were uniformly mixed and Transfer to airtight glass container, obtain the first dispersion liquid;;

[0041] (2) Place the glass container in an ultrasonic cleaning machine, and after processing it for 2.5 hours at a power of 100W, centrifuge the treated liquid at 10,000 rpm for 20 minutes to collect the precipitate;

[0042](3) Disperse the precipitate in 0.5% acetic acid solution, centrifuge at 15000 rpm for 10 minutes and collect the precipitate, repeat twice;

[0043] (4) The precipitate was dispersed in deionized water, centrifuged at 4500 rpm for 20 minutes, and 50 mL of the supernatant was collected to obtain a single-layer molybdenum disulfide nanosheet solution.

...

Embodiment 3

[0046] A preparation method of single-layer molybdenum disulfide nanosheets, comprising the steps of:

[0047] (1) 250 mg of molybdenum disulfide powder with a particle size of less than 2 μm, 110 mg of chitosan powder, 1.2 g of 1-butyl-3-methylimidazolium hexafluorophosphate and 15 mL of ethanol were uniformly mixed and transferred to a closed glass container to obtain the first a dispersion;

[0048] (2) Place the glass container in an ultrasonic cleaning machine, and after processing it for 1.5 hours at a power of 150W, centrifuge the treated liquid at 15,000 rpm for 10 minutes to collect the precipitate;

[0049] (3) Disperse the precipitate in 0.5% acetic acid solution, centrifuge at 10,000 rpm for 20 minutes and collect the precipitate, repeat twice;

[0050] (4) The precipitate was dispersed in deionized water, centrifuged at 3500 rpm for 40 minutes, and 50 mL of the supernatant was collected to obtain a single-layer molybdenum disulfide nanosheet solution.

[0051] T...

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Abstract

The invention relates to a preparation method for single-layer molybdenum disulfide nanosheets. The method comprises the following steps: (1) 200-250mg of molybdenum disulfide powder with a particle size less than 2 micrometers, 90-110mg of chitosan powder, 1-1.2g of an ionic liquid and 10-15mL of an organic solvent are uniformly mixed and transferred to a sealed glass container, so a first dispersion solution is obtained; (2) the first dispersion solution is subjected to ultrasonic treatment, after the ultrasonic treatment is finished, high-speed centrifugation separation is performed, and a precipitate is collected; (3) the precipitate obtained in the step (2) is dispersed in an acetic acid solution with a concentration of 0.5%, centrifugation separation is performed, a precipitate is collected, and the above process is repeated for two times; and (4) the precipitate obtained in the step (3) is dispersed in deionized water, low-speed centrifugation separation is performed, and a supernatant is collected, so a single-layer molybdenum disulfide nanosheet solution is obtained. According to the invention, the process is simple, costs are low, the yield is higher than 25%, repeatability is good, and defects of large size, a low single-layer yield, nonuniform particle size and the like of molybdenum disulfide nanosheets obtained in the prior art can be overcome.

Description

technical field [0001] The invention relates to the field of novel nanomaterials, in particular to a method for preparing single-layer molybdenum disulfide nanosheets. Background technique [0002] As a graphene-like two-dimensional nanomaterial, layered molybdenum disulfide nanomaterials have many unique physical and chemical properties. The bandgap of molybdenum disulfide nanomaterials is related to the number of layers. When stripped to a single layer, its semiconductor gap will be converted from an indirect bandgap structure to a direct bandgap result, resulting in a larger photon absorption cross-section than graphene and noble metal nanoparticles. , and its fluorescence quantum efficiency is also greatly enhanced. Large specific surface area, large light absorption cross-section, high quantum efficiency, good mechanical properties, and unique bandgap structure make molybdenum disulfide nanomaterials have broad application prospects in optoelectronic devices, sensors, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06B82Y40/00
CPCB82Y40/00C01G39/06C01P2004/64C01P2004/04C01P2002/84C01P2004/20Y02P20/54
Inventor 宋驁天汪远昊彭晋卿詹宸杜争
Owner 深圳理大科技产业有限公司
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