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Preparation method of two-dimensional layered nano material MXene quantum dots

A two-dimensional layered nanometer and quantum dot technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of unfavorable preparation, cumbersome steps, complicated operation, etc., and achieve convenient observation and adjustment, simple and safe operation , a wide range of effects

Active Publication Date: 2019-09-24
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common quantum dot preparation methods include chemical solution growth method, epitaxial growth method and electric field confinement method. Among them, the conductivity of quantum dots prepared by chemical solution growth method is extremely low, the preparation cost of epitaxial growth method is high, and the preparation cost of electric field confinement method is Higher, the yield is lower, and the above three methods are complicated to operate, and the steps are cumbersome, which is not conducive to large-scale preparation

Method used

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  • Preparation method of two-dimensional layered nano material MXene quantum dots
  • Preparation method of two-dimensional layered nano material MXene quantum dots
  • Preparation method of two-dimensional layered nano material MXene quantum dots

Examples

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Embodiment 1

[0034] See figure 1 , figure 1 It is a schematic diagram of the principle of the preparation method of a two-dimensional layered nanomaterial MXene quantum dot provided by the embodiment of the present invention. As shown in the figure, the principle of the liquid-phase femtosecond laser ablation method is as follows: the femtosecond laser is a pulsed Formally emitted laser light, with a duration of only a few femtoseconds (1 femtosecond = one quadrillionth of a second), is the shortest pulse that can be obtained under experimental conditions. After being reflected by the reflector 1, the femtosecond laser is focused by the lens 2, passes through a layer of liquid medium on the target 3, and then irradiates the solid-liquid interface. During this process, the femtosecond laser may be reflected at the upper interface of the liquid, refraction and self-focusing phenomena may occur in the liquid, and may be absorbed by the liquid at the same time, causing the molecules of the li...

Embodiment 2

[0055] In this example, the MAX phase raw material is ground and sieved Ti 3 AlC 2 (titanium aluminum carbide), the specific preparation steps of the two-dimensional layered nanomaterial MXene quantum dots are as follows:

[0056] Step 1: Mix LiF powder and HCl solution with a concentration of 9mol / L according to the ratio of 2g:20mL, and stir until LiF is completely dissolved to obtain an etchant of hydrochloric acid and LiF;

[0057] Step 2: Ground and sieved Ti 3 AlC 2 Slowly added to the etchant, and kept at 35°C for 24h under magnetic stirring with a rotation speed of 600rpm, wherein Ti 3 AlC 2 The mixing ratio with the etchant is 2g:20mL;

[0058] Step 3: The mixture obtained in step 2 is centrifuged and washed with deionized water to obtain an upper layer solution, and the pH of the upper layer solution is >6;

[0059] Step 4: Transfer the upper layer solution to a beaker, add deionized water to make it up to 300mL, pass argon into the obtained solution, then vacu...

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Abstract

The invention relates to a preparation method of two-dimensional layered nano material MXene quantum dots. The method comprises the following steps: step 1, preparing a two-dimensional layered nano material MXene by adopting an etching process; step 2, dissolving the two-dimensional layered nano material MXene into deionized water or an organic solvent, and performing an ablation reaction under a femtosecond laser; and step 3, performing centrifugal separation on a solution obtained by ablation of the femtosecond laser to obtain a supernatant containing the two-dimensional layered nano material MXene quantum dots. The method provided by the invention utilizes the liquid phase femtosecond laser ablation process to prepare the two-dimensional layered nano material MXene quantum dots, is simple and safe to operate, has lower costs, uses a green solvent such as the deionized water to reduce pollution to the environment, has high reproducibility, is easy to operate, can be used for large-scale production, and can control particle sizes and particle size distribution of the two-dimensional layered nano material MXene quantum dots by controlling power of the femtosecond laser, thereby obtaining the MXene quantum dots with better photoelectric properties.

Description

technical field [0001] The invention belongs to the technical field of preparation of two-dimensional layered material quantum dots, and in particular relates to a preparation method of two-dimensional layered nanomaterial MXene quantum dots. Background technique [0002] In recent years, the great success of graphene materials has attracted great attention to the exploration of new 2D (two-dimensional) layered inorganic materials. When the lateral dimensions of two-dimensional materials are less than 100nm, they will show quantum confinement. Effect, this material is called quantum dots, with the deepening of research, researchers found that semiconductor nanoclusters also exhibit obvious quantum confinement effects, also known as "quantum dots". Although the prepared quantum dots are called zero-dimensional materials, zero-dimensional materials are only classified and named relative to the lateral length dimension of two-dimensional materials, and the original 2D lattice o...

Claims

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Application Information

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IPC IPC(8): C01B32/90B82Y30/00B82Y40/00
CPCC01B32/90B82Y30/00B82Y40/00C01P2004/64C01P2004/04C01P2004/03
Inventor 仲鹏张兴茂王昱程雷毅敏马晓华
Owner XIDIAN UNIV
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