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A method for preparing single-layer graphene folded structure with controllable twist angle

A technology of single-layer graphene and twist angle, which is applied in the direction of single-layer graphene, chemical instruments and methods, carbon compounds, etc., can solve the problems of low repetition rate, complicated process flow, and strict environmental requirements, and achieve stable folding, The effect of simple process

Active Publication Date: 2021-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology has certain limitations, and it needs to be carried out in a low temperature environment (4.2K), and the requirements for the environment are relatively strict.
[0006] To sum up, in the existing graphene folding technology, the method of folding by probe generally has the defects of low repetition rate or strict environmental requirements; the non-probe graphene folding method has a complicated process and is easy to introduce Pollution and Impurities

Method used

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  • A method for preparing single-layer graphene folded structure with controllable twist angle
  • A method for preparing single-layer graphene folded structure with controllable twist angle
  • A method for preparing single-layer graphene folded structure with controllable twist angle

Examples

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Effect test

Embodiment 1

[0037] Such as figure 2 As shown, a method for preparing a single-layer graphene folded structure with controllable torsion angle, the steps are as follows:

[0038] (1) Using the micromechanical exfoliation method on SiO 2 / Si surface to prepare single-layer graphene, and use the tapping mode of atomic force microscope (AFM) to scan the morphology to obtain the height of single-layer graphene;

[0039] (2) if figure 1 As shown, the SiO 2 / Si substrate and the single-layer graphene loaded on it are placed in a high-humidity environment with a relative humidity greater than 90% and sealed for two weeks (the specific operation is: the graphene sample is placed in a small petri dish without a lid; the open Place the small Petri dish with the mouth in the large Petri dish, and drop 10-20mL of deionized water into the empty area of ​​the large Petri dish; then cover the lid of the large Petri dish, put it in a sealed bag, seal it, and store it in a cool and dry place for two d...

Embodiment 2

[0048] A method for preparing a single-layer graphene folded structure with controllable twist angle, which is basically the same as in Example 1, except that the probe in step (4) is SiO with a diameter of 5 μm 2 Microsphere tip, and the diameter of the microsphere is 1 / 3 of the maximum size along the direction of the proposed folding motion on the graphene; the size of the load in step (6) is 8nN; the moving speed of the probe in step (7) is 0.3μm / s .

Embodiment 3

[0050] A method for preparing a single-layer graphene folded structure with controllable twist angle, which is basically the same as in Example 1, except that the probe in step (4) is SiO with a diameter of 10 μm 2 A microsphere tip, and the diameter of the microsphere is 1 / 3 of the largest dimension along the direction of the proposed folding motion on the graphene; the size of the load in step (6) is 20nN; the moving speed of the probe in step (7) is 0.1μm / s .

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Abstract

The invention relates to a method for preparing a single-layer graphene folding structure with controllable twist angle. First, SiO 2 The single-layer graphene sample on the / Si substrate is placed in high humidity, so that interfacial water is formed between the graphene and the substrate; then the sample is taken out and placed on the AFM sample stage equipped with a humidity sensing chamber, using a microsphere probe, in the normal Position the probe near the pointed contour of single-layer graphene under humidity; increase the humidity of the AFM humidity chamber, place the needle at the positioning point and hold it to form a stable meniscus between the needle and the sample; then set the direction of movement of the probe and speed, so that the needle tip moves slowly on the graphene surface at a constant speed to a predetermined position and then lifts the needle to obtain a graphene folded structure with a controllable twist angle. The invention has a simple process flow, can realize controllable folding of single-layer graphene without harsh operating environment, and can flexibly and accurately control the torsion angle, laying a foundation for the application of graphene in optoelectronic devices and quantum devices.

Description

technical field [0001] The invention belongs to the technical field of graphene folding, and relates to a method for preparing a single-layer graphene folding structure with controllable torsion angle. Background technique [0002] Graphene is made of sp 2 The single-layer two-dimensional honeycomb structure formed by the close packing of hybridized carbon atoms has excellent mechanical, electrical, thermal and optical properties: such as the intrinsic strength of up to 130GPa, which is 100 times higher than that of steel; the carrier mobility at room temperature is 15000cm 2 / (V·s), higher than carbon nanotubes and silicon crystals; the thermal conductivity of defect-free single-layer graphene is as high as 5300W / mK; at the same time, it is almost completely transparent, with only 2.3% absorption of light. The early folded graphene structures came from accidental folds during mechanical exfoliation. When single-layer graphene is folded, there is a twist angle between lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
CPCC01B2204/02C01B32/194
Inventor 黄瑶彭倚天
Owner DONGHUA UNIV
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