Method and application of preparing large-area two-dimensional molybdenum diselenide thin films with different layers

A molybdenum diselenide, large-area technology, applied in the direction of chemical instruments and methods, selenium/tellurium compounds, metal selenide/telluride, etc., can solve the problems of small size, complicated operation process, irregularity, etc., to achieve good Continuity and homogeneity, high crystallization quality, simple method results

Active Publication Date: 2022-03-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still challenging to prepare high-quality and large-area two-dimensional material thin films
The mechanical exfoliation method is simple and easy to implement, low in cost, and the obtained thin film crystals are of high quality, but the exfoliated flakes are uneven in size, thickness, crystal orientation, etc. suitable for mass production
Although the preparation using the hydrothermal method is relatively low in cost, it has disadvantage

Method used

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  • Method and application of preparing large-area two-dimensional molybdenum diselenide thin films with different layers
  • Method and application of preparing large-area two-dimensional molybdenum diselenide thin films with different layers
  • Method and application of preparing large-area two-dimensional molybdenum diselenide thin films with different layers

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Experimental program
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Effect test

Embodiment 1～4

[0025] A method for preparing a large-area two-dimensional molybdenum diselenide film with different layers, comprising the following steps:

[0026] Step 1. In the corundum boat, mix 2mg of molybdenum trioxide (99.998%) and 0.2mg of sodium chloride evenly to obtain a mixed powder. The sheet is set above the mixed powder and the polished surface of the silicon dioxide substrate faces downward, wherein, in terms of parts by mass, the ratio of molybdenum trioxide to sodium chloride is 10:1, and the ratio of the silicon dioxide substrate to the mixed powder is The distance is 5mm;

[0027] Step 2, 25mg of selenium powder (99.999%) is placed in the furnace body, and the furnace body is operated three times to discharge the air and water vapor in the furnace body. Each operation is: the furnace body is evacuated with a vacuum pump state, feed argon gas (atmospheric pressure) in the furnace body; under the condition of feeding argon gas, the selenium powder and the mixed powder are...

Embodiment 3

[0030] The two-dimensional molybdenum diselenide thin film gained in embodiment 3 is tested: the photograph of the two-dimensional molybdenum diselenide thin film of the large area different number of layers of preparation is as follows figure 1 As shown, the size of two-dimensional molybdenum diselenide film can reach centimeter scale. Its optical microscope image is figure 2 As shown, as the number of molybdenum diselenide layers increases, the contrast gradually changes from light purple to bright blue. At the same time, it can be clearly seen that the two-dimensional molybdenum diselenide film is very uniform and the single layer size is as long as 3mm.

[0031] image 3 Raman spectra of two-dimensional molybdenum diselenide thin films with different layers and large areas prepared. Use a laser wavelength of 532nm to excite 1-10 layers and >10 layers of two-dimensional molybdenum diselenide thin films, and finally can obtain: A of a single-layer two-dimensional molybden...

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Abstract

The invention discloses a method and application for preparing a large-area two-dimensional molybdenum diselenide thin film with different layers. The method comprises the following steps: uniformly mixing molybdenum trioxide and sodium chloride to obtain a mixed powder; The surface-polished silicon dioxide substrate is arranged on the top of the mixed powder and the polished surface of the silicon dioxide substrate is facing down, the selenium powder is placed in the furnace body, and the selenium powder and the mixed powder are respectively heated for 10 to 10 minutes under an inert gas. After cooling to room temperature for 15 minutes, two-dimensional molybdenum diselenide films with different layers are obtained on the surface of the silicon dioxide substrate. The present invention prepares high-quality single-layer or multi-layer molybdenum diselenide films by chemical vapor deposition. The method of the present invention has the advantages of being simple, fast, clean, low in cost and controllable, etc. The prepared two-dimensional molybdenum diselenide thin film has a large area, the multilayer size is about 5 cm, and the single layer size can reach 3 mm in length, and has a large High crystallization quality and very good continuity and uniformity.

Description

technical field [0001] The invention belongs to the technical field of preparing two-dimensional thin films by chemical vapor deposition, and specifically relates to a method and application for preparing two-dimensional molybdenum diselenide thin films with large areas and different layers. Background technique [0002] Since the discovery of graphene in 2004, two-dimensional layered materials have attracted great attention. In recent years, two-dimensional layered transition metal dichalcogenides (TMDs) with atomic thickness led by molybdenum disulfide have attracted extensive research due to their excellent properties. TMDs materials not only have a layered structure similar to graphene, maintain the excellent properties of graphene in mechanics, heat, electricity, etc., but also overcome the disadvantage of graphene's zero band gap, especially when the thickness is reduced to a single layer , TMDs materials show an indirect-to-direct bandgap transition, resulting in ext...

Claims

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Application Information

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IPC IPC(8): C01B19/00
CPCC01B19/007C01P2004/01C01P2004/02C01P2002/82
Inventor 印寿根闫慧于童
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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