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Single-layer copper selenide two-dimensional atomic crystal material and preparation method and application thereof

A two-dimensional atomic crystal and copper selenide technology, applied in the field of nanomaterials, can solve the problems of few reports and difficulties in materials with a single-layer two-dimensional structure

Inactive Publication Date: 2019-07-19
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, among the two-dimensional materials reported so far, most of their bulk phases are layered materials, and the layers are connected by van der Waals force, so the single-layer structure of this material is relatively easy to prepare
However, for materials whose bulk phase is a non-layered structure, it is more difficult to prepare materials with a single-layer two-dimensional structure, and there are few reports

Method used

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  • Single-layer copper selenide two-dimensional atomic crystal material and preparation method and application thereof
  • Single-layer copper selenide two-dimensional atomic crystal material and preparation method and application thereof
  • Single-layer copper selenide two-dimensional atomic crystal material and preparation method and application thereof

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Effect test

Embodiment 1

[0039] 1. Preparation of copper single crystal substrate

[0040] In an ultra-high vacuum chamber, an argon ion sputtering treatment is performed on the copper single crystal with an argon ion gun to obtain a copper substrate, and the copper substrate is heated and kept at 500° C. for 30 minutes to obtain a clean and flat copper single crystal substrate.

[0041] 2. Preparation of single-layer copper selenide two-dimensional atomic crystal material with one-dimensional moiré stripe structure

[0042] After preparing the copper single crystal substrate, in an ultra-high vacuum environment, using a thermal resistance k-cell molecular evaporation source, at an evaporation temperature of 125°C, evaporate and evenly deposit selenium atoms on the copper single crystal at 25°C On the surface of the substrate, the deposition time of selenium atoms is 20 minutes, and a single-layer copper selenide two-dimensional atomic crystal material with a one-dimensional moiré stripe structure is ...

Embodiment 2

[0044] 1. Preparation of copper single crystal substrate

[0045] In an ultra-high vacuum chamber, an argon ion sputtering treatment is performed on the copper single crystal with an argon ion gun to obtain a copper substrate, and the copper substrate is heated and kept at 500° C. for 30 minutes to obtain a clean and flat copper single crystal substrate.

[0046] 2. Preparation of single-layer copper selenide two-dimensional atomic crystal material with one-dimensional moiré stripe structure

[0047]After preparing the copper single crystal substrate, in an ultra-high vacuum environment, using a thermal resistance k-cell molecular evaporation source, at an evaporation temperature of 120°C, evaporate and evenly deposit selenium atoms on the copper single crystal at 30°C On the surface of the substrate, the deposition time of selenium atoms was 10 minutes. After the deposition is over, the copper single crystal substrate and the selenium atoms deposited on the surface of the co...

Embodiment 3

[0049] 1. Preparation of copper single crystal substrate

[0050] In an ultra-high vacuum chamber, an argon ion sputtering treatment is performed on the copper single crystal with an argon ion gun to obtain a copper substrate, and the copper substrate is heated and kept at 500° C. for 10 minutes to obtain a clean and flat copper single crystal substrate.

[0051] 2. Preparation of single-layer copper selenide two-dimensional atomic crystal material with one-dimensional moiré stripe structure

[0052] After preparing the copper single crystal substrate, in an ultra-high vacuum environment, using a thermal resistance k-cell molecular evaporation source, at an evaporation temperature of 125°C, evaporate and evenly deposit selenium atoms on the copper single crystal at 30°C On the surface of the substrate, the deposition time of selenium atoms is 15 minutes. During the deposition process, the copper single crystal substrate and selenium atoms are kept at a growth temperature of 30...

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Abstract

The invention provides a single-layer copper selenide two-dimensional atomic crystal material, the surface of which has a one-dimensional Morie fringe structure formed by lattice mismatch. The one-dimensional Morie fringe structure has a period of 1.8 nm; in a two-dimensional plane of the single-layer copper selenide two-dimensional atomic crystal material, copper atoms and selenium atoms form a periodic hexagonal honeycomb structure in an alternating form; and the lattice period of the hexagonal honeycomb structure is 0.44 nm in a high symmetry direction and is 0.41 nm in other two high symmetry directions. The invention further relates to a preparation method and application of the single-layer copper selenide two-dimensional atomic crystal material. The single-layer copper selenide two-dimensional atomic crystal material provided by the invention is a two-component two-dimensional honeycomb crystal material, electrons of which exhibit a 'node-line-type' Dirac fermion band structurein copper selenide. The single-layer copper selenide two-dimensional atomic crystal material provided by the invention can be used as a new electrical material for constructing non-dissipative electronic devices.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a single-layer copper selenide two-dimensional atomic crystal material and its preparation method and application. Background technique [0002] Two-dimensional materials have various properties and are easy to control and integrate. Their colorful electronic states and physical effects provide new opportunities for the construction of new electronic devices. Among them, graphene, as the originator of two-dimensional materials, has become the focus and representative of two-dimensional atomic crystal materials since it was successfully exfoliated. [0003] Graphene with a single atomic layer thickness has many unique physical properties, such as: single-layer graphene has ultra-high carrier mobility, ultra-high light transmittance, and quantum Hall effect at room temperature, making it widely used in many fields. It has huge application potential in all fields, and it is a...

Claims

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Application Information

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IPC IPC(8): C30B29/46C23C14/24C23C14/06C23C14/58C23C14/02C30B29/64
CPCC23C14/022C23C14/06C23C14/24C23C14/5806C30B29/46C30B29/64
Inventor 卢建臣林晓高蕾钱凯张帅杜世萱高鸿钧
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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