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Method for self-assembling homogeneous/heterojunction nano-film by utilizing fluid boundary layer effect

A fluid boundary and self-assembly technology, applied in nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of low heterojunction formation efficiency, high accident risk, and high cost, and achieve assembly The effect of low environmental requirements, excellent controllability, and low experimental risk

Inactive Publication Date: 2021-08-17
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current synthesis methods have obvious limitations. The cost of mechanical transfer method is the lowest, but the formation efficiency of heterojunction is low; It can synthesize heterojunction with high quality and large area, but it still needs to use high temperature and high heat equipment such as tube furnace, which costs more and the risk of accident is greater

Method used

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  • Method for self-assembling homogeneous/heterojunction nano-film by utilizing fluid boundary layer effect
  • Method for self-assembling homogeneous/heterojunction nano-film by utilizing fluid boundary layer effect
  • Method for self-assembling homogeneous/heterojunction nano-film by utilizing fluid boundary layer effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The nano-film preparation method is as follows: take 2.5 mg of tungsten disulfide nano-sheets, add 10 ml of 50% ethanol aqueous solution, shake well, and use an ultrasonic breaker to perform ultrasonication for 4 hours, so that the nano-sheets are fully broken into small fragments and uniformly dispersed; Centrifuge at 2000rpm / min for 10 minutes to separate nanosheets with large diameters, and take the upper layer to obtain a dispersion with uniform nanoparticle size. Take 5mL of the dispersion and add it to a glass dish filled with 25mL of chloroform, and the dispersion is suspended on the surface of chloroform; slowly add 50% absolute ethanol solution to make the surface of the dispersion continue to expand, and drive the nanomaterials in the two-phase solvent A thin film is formed at the interface; then the glass slide wetted with water after pickling is inserted into the solution and lifted slowly, so that the film gathers to the upper end of the slide under the effe...

Embodiment 2

[0033] The nanosheets were replaced with molybdenum disulfide nanosheets, the key parameters are shown in Table 1, and other parameters are the same as in Example 1.

Embodiment 3

[0035] The nanosheets were replaced with tungsten diselenide nanosheets, the key parameters are shown in Table 1, and other parameters are the same as in Example 1.

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Abstract

The invention discloses a method for self-assembling a homogeneous / heterojunction nano-film by utilizing a fluid boundary layer effect. The method comprises the following steps of: dissolving a nano-material in an ethanol solution, performing ultrasonic stripping and dispersion by using an ultrasonic crusher, continuously centrifuging to improve the uniformity, slowly dripping nano-material dispersion liquid into a glass dish filled with trichloromethane, wherein the nano-material forms a film on the surface of the absolute ethyl alcohol solution and the interface of the ethyl alcohol solution and the trichloromethane solution; and obliquely inserting a substrate wetted by distilled water into the liquid level, and slowly lifting to form a film. The method is low in cost, simple and convenient to operate and wide in application range.

Description

technical field [0001] This research involves the technical field of preparation of two-dimensional thin film materials, specifically a method for self-assembling homogeneous / heterojunction nanomembranes by using the fluid boundary layer effect. Background technique [0002] Two-dimensional materials have special structural arrangements and have proven promising for multifunctional applications such as electronics, optoelectronics, energy storage and conversion. It plays an important role in the development of cutting-edge technology, but a single two-dimensional material is limited to a certain extent due to the inherent characteristics of its structure and still fails to achieve the desired effect. Therefore, in order to achieve the performance improvement and breakthrough of two-dimensional materials, it is an inevitable choice to meet the needs of future equipment and systems by adjusting the two-dimensional structure or surface properties to achieve two-dimensional hete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C01G39/06C01B19/04B82Y30/00
CPCC01G41/00C01G39/06C01B19/007B82Y30/00C01P2004/80C01P2004/82C01P2004/04C01P2002/82C01P2002/72
Inventor 周启星罗吉伟曾辉欧阳少虎李丹丹
Owner NANKAI UNIV
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