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Growth method of two-dimensional crystal

A growth method and technology of two-dimensional crystals, applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problem of the number of sample layers, edge morphology defect density, phase, impurity concentration difficult to control, small lateral size of the sample , to be further optimized and other issues to achieve good light absorption characteristics, low production costs, and reduce oxygen vacancy defects.

Inactive Publication Date: 2020-08-11
NANCHANG UNIV
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AI Technical Summary

Problems solved by technology

Although most of the two-dimensional layered materials can be obtained by mechanical exfoliation, this method is inefficient, the lateral size of the sample is small, and the thickness is not easy to control
Graphene and some transition metal chalcogenides can be prepared by other methods such as liquid phase exfoliation or chemical vapor deposition, but parameters such as the number of layers, edge morphology, defect density, phase, and dopant concentration of the sample are difficult to control, and These methods need to be further optimized in the preparation of new two-dimensional materials

Method used

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  • Growth method of two-dimensional crystal

Examples

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example 1

[0036]A two-dimensional crystal growth method, using lead chloride and cesium chloride as raw materials to prepare a cesium lead chloride solution, on the basis of the hydrothermal synthesis method, further steps such as film formation, atmosphere ventilation, and surface expansion are used to prepare cesium lead chloride solution. Lead chloride crystals are made into cesium lead chloride two-dimensional crystals, such as figure 1 shown, including the following steps:

[0037] Measure 7.5ml dimethylformamide (DMF) with a graduated cylinder and pour it into a prepared polytetrafluoroethylene vessel as a highly polar original solvent;

[0038] Weigh 1 mol of lead chloride with an electronic scale and pour it into a polytetrafluoroethylene container, place it on a magnetic stirrer and stir until the solution is colorless;

[0039] Weigh 1mol of cesium chloride with an electronic scale and pour it into a polytetrafluoroethylene container, and stir on a magnetic stirrer until the ...

example 2

[0045] A two-dimensional crystal growth method, using lead chloride and cesium chloride as raw materials to prepare a cesium lead chloride solution, on the basis of the hydrothermal synthesis method, further steps such as film formation, atmosphere ventilation, and surface expansion are used to prepare cesium lead chloride solution. Lead-chloride crystal is made cesium-lead-chloride two-dimensional crystal, comprises the following steps:

[0046] Measure 7.5ml dimethyl sulfoxide (DMSO) with a graduated cylinder and pour it into a prepared polytetrafluoroethylene vessel as a highly polar original solvent;

[0047] Weigh 1 mol of lead chloride with an electronic scale and pour it into a polytetrafluoroethylene container, place it on a magnetic stirrer and stir until the solution is colorless;

[0048] Weigh 1mol of cesium chloride with an electronic scale and pour it into a polytetrafluoroethylene container, and stir on a magnetic stirrer until the solution is colorless;

[004...

example 3

[0054] A two-dimensional crystal growth method, using lead chloride and cesium chloride as raw materials to prepare a cesium lead chloride solution, on the basis of the hydrothermal synthesis method, further through three steps of film formation, atmosphere, and surface expansion. Cesium lead chloride crystal is made cesium lead chloride two-dimensional crystal, comprises the following steps:

[0055] Measure 7.5ml of butyrolactone (GBL) with a graduated cylinder and pour it into a prepared polytetrafluoroethylene vessel as a highly polar original solvent;

[0056] Weigh 1 mol of lead chloride with an electronic scale and pour it into a polytetrafluoroethylene container, place it on a magnetic stirrer and stir until the solution is colorless;

[0057] Weigh 1mol of cesium chloride with an electronic scale and pour it into a polytetrafluoroethylene container, and stir on a magnetic stirrer until the solution is colorless;

[0058] Measure 7.5ml of A-olefin sulfonate with a gra...

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Abstract

The invention relates to the technical field of crystal preparation, in particular to a growth method of a two-dimensional crystal. The method comprises the steps of film preparation, atmosphere introduction, surface expansion and the like. In the film preparation process, a surface active substance needs to be added into an original solvent to reduce the surface tension of the solvent, and in theatmosphere introduction process, a gaseous solvent incompatible with the original solvent needs to be introduced to enable crystals to be separated out more easily. According to the growth method ofthe two-dimensional crystal, the two-dimensional crystal does not need to be placed in a vessel for culture, so that the opportunity of contact with other substances in the vessel is reduced, the generated crystal has few impurities and high purity, and meanwhile, a two-dimensional crystal with controllable area can be grown due to the fact that the size of a crystal growing tool can be changed atwill.

Description

technical field [0001] The invention relates to the technical field of crystal preparation, in particular to a two-dimensional crystal growth method. Background technique [0002] Since graphene was discovered in 2004, searching for other new two-dimensional crystal materials has been a frontier topic in the field of two-dimensional crystal research. Two-dimensional atomic crystals are materials with a thickness of one or several atomic layers. This type of material has the characteristics of low dimensionality, weak shielding effect, strong quantum confinement effect, rich physical properties and strong control ability. Therefore, it is widely used in nanoelectronic devices and optoelectronic devices. It has great potential application value. [0003] At present, research on two-dimensional materials focuses on preparation, characterization, modification, theoretical calculation, and application exploration, and great progress has been made. For example, in terms of prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/64C30B29/12C30B7/00
CPCC30B7/00C30B29/12C30B29/64
Inventor 邓贞宙周凯
Owner NANCHANG UNIV
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