Single-layer CrI3 sheet prepared based on chemical vapor transport and method

A chemical vapor phase, single-layer technology, applied in chromium halide and other directions, can solve the problems of high preparation environment requirements, high experimental cost, small size, etc., and achieve the effects of easy control of reaction conditions, simple operation, and few materials.

Pending Publication Date: 2022-07-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of monolayer CrI prepared based on chemical vapor transport 3 Thin slice and method, in order to solve present preparation single-layer CrI 3 However, there are technical problems such as high preparation environment requirements, high experiment cost, low efficiency and small size.

Method used

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  • Single-layer CrI3 sheet prepared based on chemical vapor transport and method
  • Single-layer CrI3 sheet prepared based on chemical vapor transport and method
  • Single-layer CrI3 sheet prepared based on chemical vapor transport and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of preparation of monolayer CrI based on chemical vapor transport 3 The method of flakes includes the following steps:

[0054] Put 5mg Cr powder, 35mg crystalline iodine powder and 5mg potassium fluoride powder into the bottom of the ampoule tube (with necking), after mixing, vacuumize, when the vacuum degree reaches 1.7×10 -4 Encapsulation at Pa, the iodine powder needs to be fixed with liquid nitrogen in the vacuum sealing process to prevent the volatilization of the iodine powder; then the ampoule tube is put into the raw material area in the double temperature zone tube furnace, and mica (mica) is placed in the reaction area. ) as the growth substrate; then set the following heating program in the double-temperature zone tube furnace for heat treatment: the raw material area is heated from room temperature at a heating rate of 6 ° C / min to 850 ° C for 2 hours, and then naturally cooled after 2 hours of heat preservation. Cooled to room temperature; the reac...

Embodiment 2

[0057] A kind of preparation of monolayer CrI based on chemical vapor transport 3 The method of flakes includes the following steps:

[0058] Put 5mg Cr powder, 35mg crystalline iodine powder and 5mg potassium chloride powder into the bottom of the ampoule tube (with necking), mix and vacuumize, when the vacuum degree reaches 1.7×10 -4 The iodine powder needs to be fixed with liquid nitrogen in the vacuum sealing process to prevent the volatilization of the iodine powder; then the ampoule tube is put into the raw material area in the double temperature zone tube furnace, and mica is placed in the reaction area for growth. Then set the following heating program in the double-temperature zone tube furnace for heat treatment: the raw material zone is heated from room temperature at a heating rate of 7 °C / min, heated to 900 °C for 2 hours, and then naturally cooled for 2.5 hours. to room temperature; the reaction zone was heated from room temperature to 580 °C at a heating rate o...

Embodiment 3

[0061] A kind of preparation of monolayer CrI based on chemical vapor transport 3 The method of flakes includes the following steps:

[0062] Put 5mg Cr powder, 35mg crystalline iodine powder and 5mg potassium bromide powder into the bottom of the ampoule tube (with necking), after mixing, vacuumize, when the vacuum degree reaches 1.7×10 -4 The iodine powder needs to be fixed with liquid nitrogen in the vacuum sealing process to prevent the volatilization of the iodine powder; then the ampoule tube is put into the raw material area in the double temperature zone tube furnace, and mica is placed in the reaction area for growth. Then set the following heating program in the double-temperature zone tube furnace for heat treatment: heat the raw material area from room temperature to 950 °C at a heating rate of 8 °C / min for 2 hours, and then heat it for 3 hours and then naturally cool down to room temperature. ; The reaction zone was heated from room temperature to 600 °C at a hea...

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Abstract

The invention discloses a single-layer CrI3 sheet prepared on the basis of chemical vapor transport and a method, belongs to the technical field of two-dimensional ferromagnetic materials, and solves the technical problems of high preparation environment requirements, high experiment cost, low efficiency, small size and the like during preparation of single-layer CrI3 at present. According to the method for preparing the single-layer CrI3 sheet based on chemical vapor transport, the Cr raw material, the crystallized iodine powder and the transport agent powder are used for preparing the single-layer CrI3 sheet with the large area through the program control temperature condition, and the method has the advantages of being few in related materials, easy to operate, high in efficiency, low in cost and capable of achieving large-scale production in the preparation process. The single-layer CrI3 sheet prepared by the method is large in area, high in purity and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional ferromagnetic materials, in particular to a single-layer CrI prepared based on chemical vapor transport 3 Sheets and methods. Background technique [0002] Ferromagnetism is a fundamental quantum property of matter, which specifically refers to the phenomenon that due to the interaction of electrons in matter, the arrangement of magnetic moments tends to be consistent, thus showing magnetization on a macroscopic level. Humans have been discovering and utilizing magnetic phenomena for thousands of years. In modern times, with the development of quantum mechanics and solid state theory, the origin of magnetism has been studied more and more deeply, such as the relationship between magnetism and dimensions. In the past, scientists theoretically predicted that two-dimensional isotropic ferromagnetism does not exist. However, in 2017, scientists in two-dimensional chromium triiodide (CrI 3 ) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/04
CPCC01G37/04C01P2006/12C01P2004/02C01P2004/04C01P2002/82C01P2004/20
Inventor 程迎春时健罗小光刘凡徐金鹏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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