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Strain-sensitive two-dimensional ferromagnetic Cr2Te3 nanosheet and preparation method thereof

A nanosheet and ferromagnetic technology, applied in the field of two-dimensional ferromagnetic Cr2Te3 nanosheets and its preparation, can solve the problems of two-dimensional thinning, incompatible preparation methods, uncontrollable material thickness and lateral dimensions, etc., and achieve ultra-high shape Kernel density, good reproducible effect

Inactive Publication Date: 2021-07-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

First of all, the applicable object of this method is limited to layered two-dimensional materials represented by graphene, and non-layered materials, which account for the vast majority of material types, cannot be thinned to a two-dimensional scale by this method; secondly, mechanical The stripping method is very inefficient, cannot control the thickness and lateral dimensions of the material, and does not match the preparation methods in the industrial field

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  • Strain-sensitive two-dimensional ferromagnetic Cr2Te3 nanosheet and preparation method thereof
  • Strain-sensitive two-dimensional ferromagnetic Cr2Te3 nanosheet and preparation method thereof
  • Strain-sensitive two-dimensional ferromagnetic Cr2Te3 nanosheet and preparation method thereof

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preparation example Construction

[0033] see figure 1 , the strain-sensitive two-dimensional ferromagnetic Cr provided by the present invention 2 Te 3 The preparation method of nano sheet, described preparation method mainly comprises the following steps:

[0034] Step 1, using anhydrous CrCl 2 As the reactive Cr source, Te powder was used as the reactive Te source.

[0035] Specifically, the anhydrous CrCl 2 Store and weigh in a glove box to avoid anhydrous CrCl 2 Water absorption and deterioration, the dosage is between 5mg and 10mg; when the dosage is small, the obtained samples are generally thinner (thinner than 10nm), and the number of growth on the mica substrate is small; when the dosage is large, the lateral dimension can be obtained. Larger, relatively thicker samples are densely distributed on the entire mica substrate.

[0036] Among them, the amount of Te source is 50-150 mg, preferably 80 mg; both sources use a burning boat as a carrier; the burning boat used should be baked at a temperatur...

Embodiment 1

[0044] see figure 2 , Figure 3a , Figure 5a , Figure 6a to Figure 9c , for the two-dimensional ferromagnetic Cr provided by Example 1 of the present invention 2 Te 3 The preparation method of nanosheets and the verification method of their strain sensitivity are as follows: the preparation method uses a single temperature zone tube furnace as a chemical vapor deposition growth two-dimensional Cr 2 Te 3 For the nanosheet device, a tube furnace adopts a quartz tube with a length of 90 cm, an outer diameter of 25 mm, and a thickness of 2 mm, and the constant temperature zone range is 10 cm. Set the temperature in the central temperature zone of the tube furnace to 850°C, the heating rate to 30°C / min, and the holding time to 5min; use anhydrous CrCl 2 As the Cr source for the reaction, Te powder is used as the Te source for the reaction. The two sources use two burning boats as the carrier respectively, and the anhydrous CrCl 2 The dosage of Te powder is 10mg, and the d...

Embodiment 2

[0055] The two-dimensional ferromagnetic Cr provided by Embodiment 2 of the present invention 2 Te 3 The preparation method of nanosheet and the two-dimensional ferromagnetic Cr provided by embodiment 1 2 Te 3 The preparation method of the nanosheets is basically the same, the difference is that the incubation time is increased from 5 minutes to 15 minutes.

[0056] From Figure 3b It can be seen that after the holding time is prolonged, the lateral size of the material is significantly increased to about 40 μm, and it can grow more densely on the entire mica sheet.

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Abstract

The invention belongs to the related technical field of two-dimensional material preparation, and discloses a strain-sensitive two-dimensional ferromagnetic Cr2Te3 nanosheet and a preparation method thereof. The method comprises the following steps that firstly, a mica substrate is placed in a U-shaped groove; and then, the U-shaped groove, anhydrous CrCl2 powder and Te powder are arranged at intervals and heated, so the two-dimensional ferromagnetic Cr2Te3 nanosheet grows on the surface, close to the bottom surface of the U-shaped groove, of the mica substrate through chemical vapor deposition. According to the preparation method, the high-quality two-dimensional single crystal Cr2Te3 nanosheet is successfully grown on the lower surface of the mica substrate through a specific substrate and configuration in a proper temperature range and a proper source dosage, and the characteristic of strain sensitivity is proved through a variable-temperature Raman and bending stress applying method.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of two-dimensional materials, and more specifically relates to a strain-sensitive two-dimensional ferromagnetic Cr 2 Te 3 Nanosheets and methods for their preparation. Background technique [0002] Two-dimensional magnetic materials are considered to have broad application prospects in fields such as spintronics and van der Waals magnetic heterojunctions. How to effectively control the magnetism of two-dimensional materials is one of the main challenges in the field of two-dimensional magnetic materials. Regulating magnetism by electric field is considered to be a means to solve the basic problems of magnetic phenomena and phase transitions, but this method is limited to specific materials, and the regulation process is relatively complicated. The magnetism of a material is closely related to the stress it receives. It has long been proven to be an effective method to regulate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/46C30B29/64C30B25/00
CPCC30B25/00C30B29/46C30B29/64
Inventor 甘霖钟俊氚翟天佑
Owner HUAZHONG UNIV OF SCI & TECH
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