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A method for preparing single-layer molybdenum disulfide quantum dots based on electronic dynamic regulation

A single-layer molybdenum disulfide, electronic dynamic control technology, applied in the field of femtosecond laser applications, can solve the problems of time-consuming, low efficiency, loss of semiconductor characteristics, etc., and achieve the effect of increasing yield and enhancing absorption

Active Publication Date: 2019-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of these methods have some unavoidable shortcomings, for example: (1) the introduction of metal impurity atoms changes the structure and properties of molybdenum disulfide itself, and loses the original semiconductor properties; (2) time-consuming, inefficient, and toxic (3) Need harsh environmental conditions such as high temperature, high pressure and vacuum, complex chemical reaction process, and cumbersome post-treatment process to remove reaction by-products; (4) Easy to form nanoparticles with a wide range of particle size distribution or two-dimensional sheet

Method used

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  • A method for preparing single-layer molybdenum disulfide quantum dots based on electronic dynamic regulation
  • A method for preparing single-layer molybdenum disulfide quantum dots based on electronic dynamic regulation
  • A method for preparing single-layer molybdenum disulfide quantum dots based on electronic dynamic regulation

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Embodiment 1

[0031] Using femtosecond laser time-domain shaping pulse sequence to regulate electronic dynamics to realize a fast and green method for preparing single-layer molybdenum disulfide quantum dots, the specific steps are as follows:

[0032] Step 1. Through the basic method of femtosecond pulse time-domain shaping, the traditional femtosecond laser pulse is modulated in the time domain into a femtosecond laser pulse sequence including two sub-pulses.

[0033] Step 2. Place the bulk molybdenum disulfide target on the bottom of the glass vessel, add 5ml of distilled water to immerse the surface of the material for about 3mm, and then focus the femtosecond laser pulse sequence modulated in step 1 on the molybdenum disulfide target and water. At the interface, the material is ablated by adjusting the energy of the femtosecond laser pulse sequence, the delay between sub-pulses, and the laser scanning speed and scanning interval.

[0034] Step 3: Put the molybdenum disulfide suspension...

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Abstract

The invention relates to a method for preparing monolayer molybdenum disulfide quantum dots based on electronic dynamic regulation and control, in particular to a method for obtaining the monolayer molybdenum disulfide quantum dots with uniform particle sizes by obtaining molybdenum disulfide suspension and then centrifugally separating and belongs to the field of femtosecond laser application. The method disclosed by the invention comprises the following steps: aiming at the characteristics of a molybdenum disulfide material, carrying out pulse shaping on traditional femtosecond laser monopulse by using a Michelson interferometer to form a pulse sequence; adjusting energy of the pulse sequence, delay among sub pulses, laser scanning speed and scanning intervals; ablating blocky molybdenum disulfide in water and further regulating and controlling local transient electronic dynamics in the interaction process of laser and the material to form multistage photoablation monolayer molybdenum, and obtaining the monolayer molybdenum disulfide quantum dots with the uniform particle sizes; carrying out laser-induced water dissociation to enhance light absorption and improve the yield of the molybdenum disulfide quantum dots. The method disclosed by the invention has the advantages of no need of special chemical environment or chemical reagent, greenness, no pollution, and simple and flexible operation.

Description

technical field [0001] The invention relates to a method for preparing single-layer molybdenum disulfide quantum dots based on electronic dynamic control, and obtains a molybdenum disulfide suspension and then performs centrifugal separation to obtain a single-layer molybdenum disulfide quantum dot with uniform particle size, which belongs to femtosecond laser application field. Background technique [0002] Molybdenum disulfide is a new graphene-like two-dimensional material with unique intralayer, interlayer, and bandgap structures, so it has a wide range of applications in the fields of biomedicine, energy storage, gas sensing, catalysis, and electronic devices. application. In addition to the characteristics of molybdenum disulfide itself, the single-layer molybdenum disulfide quantum dots also have strong quantum confinement and edge effects, as well as a direct bandgap structure, and have a large number of edge active points, a high specific surface area, and a large ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68B01J27/051B01J37/34B82Y40/00C01G39/06
CPCB01J27/051B01J37/349B82Y40/00C01G39/06C01P2004/04C01P2004/30C01P2004/64C09K11/681
Inventor 姜澜李博李欣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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