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Method for regulating and controlling two-dimensional magnetic material through small molecule chemisorption

A magnetic material and chemical adsorption technology, applied in the direction of magnetic materials, nanotechnology for materials and surface science, magnetic objects, etc., can solve the problems of poor controllability of magnetic adjustment, low Curie temperature of two-dimensional materials, and complex Curie Problems such as high temperature to achieve the effect of improving magnetic properties

Pending Publication Date: 2022-08-05
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention proposes a simple and efficient molecular surface chemical adsorption method to effectively regulate the ferromagnetic properties of the two-dimensional ferromagnetic material FeGeTe, and utilizes organic small molecule adsorption on the surface of the two-dimensional material to form an organic-inorganic hybrid The compound improves the comprehensive magnetic properties of the compound, and solves the shortcomings of two-dimensional materials such as low Curie temperature and poor controllability of magnetic adjustment. The formed compound has a high Curie temperature and has broad application prospects in the field of spintronics

Method used

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  • Method for regulating and controlling two-dimensional magnetic material through small molecule chemisorption
  • Method for regulating and controlling two-dimensional magnetic material through small molecule chemisorption
  • Method for regulating and controlling two-dimensional magnetic material through small molecule chemisorption

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Embodiment 1

[0029] A method for regulating two-dimensional magnetic material by chemical adsorption of small molecules, comprising the following steps;

[0030] Step 1, exfoliation and transfer of the two-dimensional magnetic material: the single crystal of the two-dimensional magnetic material is fully washed to remove impurities, the single crystal is thinned by mechanical exfoliation or liquid phase exfoliation, and the obtained nanosheet is transferred to silicon with an oxide layer. On the substrate, the thickness of the nanosheets was measured by atomic force microscopy (AFM);

[0031] Step 2, preparation of TCNQ solution: dissolve TCNQ powder into N,N-dimethylformamide (DMF) or tetrahydrofuran (THF) solvent, and the preparation concentration is 10 -6 ~10 -3 The mol / L TCNQ solution is ready for use, suck the TCNQ solution through a pipette, and slowly drop it on the silicon oxide wafer substrate with the nanosheets transferred to ensure that the nanosheets on the substrate are full...

Embodiment 2

[0036]A method for regulating two-dimensional magnetic material by chemical adsorption of small molecules, comprising the following steps;

[0037] Step 1, exfoliation and transfer of two-dimensional magnetic materials: fully wash the iron-germanium-tellurium single crystal to remove impurities, and then exfoliate by mechanical exfoliation or liquid phase exfoliation. Transfer to the silicon oxide wafer substrate cleaned in advance; in the step 1, the thickness of the silicon oxide wafer substrate is 200 nm. The thickness of the nanosheets exfoliated in the first step is all below 200 nanometers, and the average lateral size is 25 micrometers.

[0038] Step 2, TCNQ solution preparation: Dissolve TCNQ powder into DMF solvent, the preparation concentration is 1×10 -6 The mol / L TCNQ solution is ready for use, suck the TCNQ solution through a pipette, and slowly drop it on the silicon oxide wafer substrate with the nanosheets transferred to ensure that the nanosheets on the subst...

Embodiment 3

[0041] The difference from Example 2 is that in step 3, the mechanically exfoliated two-dimensional FeGeTe flake solution was immersed for 5 minutes, the drying temperature was 55 degrees Celsius, and the drying time was 5 hours.

[0042] In step 2, the preparation concentration is 5 × 10 -5 mol / L TCNQ solution was used.

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Abstract

The invention belongs to the technical field of two-dimensional magnetic materials, and relates to a method for regulating and controlling a two-dimensional magnetic material through small molecule chemisorption. The method comprises the following steps: 1, stripping and transferring a two-dimensional magnetic material; step 2, preparation of a 7, 7, 8, 8-tetracyano p-benzoquinone dimethane (TCNQ) solution; and step 3, spreading the surface of the TCNQ molecule. The organic-inorganic hybrid compound is formed through adsorption of small organic molecules on the surface of the two-dimensional material, the comprehensive magnetic performance of the compound is improved, the defects that the two-dimensional material is low in Curie temperature, poor in magnetic adjustment controllability and the like are overcome, and the formed compound is high in Curie temperature and has wide application prospects in the field of spintronics.

Description

technical field [0001] The invention relates to a method for regulating two-dimensional magnetic materials by chemical adsorption of small molecules, which can be used in the application of room temperature spin electronic devices. It belongs to the technical field of two-dimensional magnetic materials. Background technique [0002] Two-dimensional materials are a general term for a large class of materials whose size is reduced to the limit atomic size in one dimension, while the other two dimensions are relatively large. Benefiting from the quantum confinement effect in the thickness direction of the atomic layer, 2D materials exhibit properties distinct from their parent, such as the ultra-high electron mobility of graphene. In addition, 2D materials also exhibit excellent flexibility and have great potential in wearable flexible electronic device applications. In addition, the energy band changes induced by the stacking method greatly enrich the properties and applicat...

Claims

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Application Information

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IPC IPC(8): H01F1/00H01F41/02B82Y30/00B82Y40/00
CPCH01F1/009H01F41/02B82Y30/00B82Y40/00
Inventor 胡亮周健刘福浩程李源李领伟
Owner HANGZHOU DIANZI UNIV
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