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Method for preparing ultra-thin two-dimension graphite sheet

A graphite sheet, ultra-thin technology, applied in the field of nanotechnology and new materials, can solve the problem of difficult separation and removal of polymer organic glue, and achieve the effect of clean surface, simple method and large area

Inactive Publication Date: 2008-03-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for preparing ultra-thin two-dimensional graphite sheets using ice as a material for adhering graphite, thereby overcoming the difficulty of polymer organic glue being easily absorbed by the adhesive method during preparation. Isolation removes defects to simplify fabrication

Method used

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  • Method for preparing ultra-thin two-dimension graphite sheet
  • Method for preparing ultra-thin two-dimension graphite sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Prepare a flat (111) oriented silicon single crystal polished epitaxial substrate covered by a thermal silicon oxide film with a thickness of 300 nm as a substrate. Ultrasonic cleaning with acetone for 3 times, 5 minutes each time, to clean the surface of the substrate; after drying, etch with oxygen plasma for 5 minutes, to remove the acetone molecules adsorbed on the surface.

[0026] 2. Drop a small amount of ultrapure water on the cleaned substrate. Since silicon dioxide is hydrophilic, the ultrapure water will spread itself into a water film. Control the amount of dripping water so that the thickness of the water film is within 0.1 mm .

[0027] 3. Take a piece of A-grade highly oriented pyrolytic graphite (HOPG), stick the surface graphite off with tape, and expose a new clean (0001) surface. It is required that the exposed surface should not be too flat, preferably as rough as a scale.

[0028] 4. Put the graphite in step 3 on the substrate with water film in...

Embodiment 2

[0038] 1. Prepare a flat (111) silicon single crystal polished epitaxial substrate as a substrate. Ultrasonic cleaning with acetone for 3 times, each time for 5 minutes, to clean the surface of the substrate; after drying, etch with oxygen plasma for 5 minutes, to remove the acetone molecules adsorbed on the surface.

[0039] 2. Control the temperature of the refrigerator to -20°C. Place the cleaned substrates in the freezer for 30 minutes. Take it out and place it at room temperature, a film of condensed water will naturally deposit on the substrate.

[0040] 3. Take a piece of highly oriented pyrolytic graphite, clean its surface, then take a piece of fresh tape, press and stick it on the clean graphite surface, stick some flake graphite to the tape, and then take a few clean new pieces Tape repeatedly thins the graphite on the original tape several times.

[0041] 4. Put the fresh graphite chips adhering to the adhesive tape on the substrate with water film, so that the ...

Embodiment 3

[0051] 1. Prepare a flat piece of glass as the substrate. Ultrasonic cleaning with acetone 3 times, 5 minutes each time, to clean the surface of the substrate; after drying, etch with oxygen plasma for 5 minutes, to remove the acetone molecules adsorbed on the surface.

[0052] 2. Control the temperature of the refrigerator to -17°C. Place the cleaned substrates in the freezer for 30 minutes. Take it out and place it at room temperature, a film of condensed water will naturally deposit on the substrate.

[0053] 3. Take a piece of A-grade highly oriented pyrolytic graphite (HOPG), etch its surface with oxygen plasma to carve a raised platform with a square of 10 microns and a height of 5 microns.

[0054] 4. Put the etched graphite on the substrate with a water film, so that the new clean cleaved surface of the graphite protrusion is in full contact with the water film.

[0055] 5. Put the sample in step 4 into the refrigerator to freeze for about 25 minutes, so that the wa...

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Abstract

The invention belongs to the nanometer art and novel material area, which specifically relates to a preparation method of an ultra thin two dimensional graphite piece. The preparation process is that: (1) a substrate is prepared and purified; (2) a thin water film is prepared on the substrate; (3) a massive highly oriented pyrolytic graphite is processed and a clean cleavage surface is contacted with the water film; (4) the graphite is frozen in a minor 5DGE C-30DGE C environment until the water film is solidified and stuck to the graphite; (5) the massive graphite is taken down, the large and thick graphite piece is removed through the adhesion function of an adhesive tape and a semi-finished product is obtained; (6) the semi-finished product is baked in a 50 DGE C -200 DGE C environment so as to remove the water molecules on the graphite piece surface and the water molecules between the graphite piece and the substrate, and a finished product is obtained; (7) a screening process is according to the application requirements. The invention selects water as the adhesive material to stick the graphite, the force of the Vander Waal between the water film and the graphite is very strong after the water is frozen into ice, a few under layers of graphite are taken down by adhesion from the massive graphite without leaving impurity contamination, which makes the product very clean. As the freezing point of water is at the normal temperature and the water is an easy volatile solvent, the whole preparation process is simple and the operation is convenient.

Description

technical field [0001] The invention belongs to the field of nanotechnology and new materials, and in particular relates to a preparation method of an ultrathin two-dimensional graphite sheet. Background technique [0002] The electronic structure in graphite sheets with a thickness of less than 10 atomic layers is significantly different from that of bulk material graphite, so graphite sheets with a thickness of less than 10 atomic layers (about 4 nm in total) are generally considered to be two-dimensional materials. Two-dimensional graphite sheets have extremely good electrical properties, among which the properties of single-layer graphite are the most ideal. [0003] In 2004, British scientists prepared single-layer graphite in the laboratory for the first time (Science 306, 666 (2004)). The electrons in single-layer graphite belong to massless Dirac fermions, so the discovery of this material opens up a new way to use condensed matter materials to study quantum electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00
Inventor 史志文张琨薛海舟蔡洪冰王晓平侯建国
Owner UNIV OF SCI & TECH OF CHINA
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