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A preparation method of flaky graphene and a flaky graphene device prepared using the method

A flake graphite and flake graphite technology, which is applied in the field of flake graphene devices, can solve the problems of low purity, limited graphene application, and low yield.

Active Publication Date: 2016-08-24
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the current technology for preparing graphene cannot meet the basic requirements of industrialization such as simple preparation method, low cost, stable and controllable product performance, especially graphene devices cannot be directly produced, the yield is low, and most of the obtained products contain The mixed system of graphene is difficult to separate and the purity is not high. Even if graphene materials are obtained, it is difficult to make more practical graphene devices, which greatly limits the application of graphene in a wider range and wider fields

Method used

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  • A preparation method of flaky graphene and a flaky graphene device prepared using the method
  • A preparation method of flaky graphene and a flaky graphene device prepared using the method
  • A preparation method of flaky graphene and a flaky graphene device prepared using the method

Examples

Experimental program
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Effect test

Embodiment 1

[0089] Example 1 Preparation of scaly graphene by bonded electrolytic microwave method Take a piece of flexible expanded graphite flakes, wash and dry, and use a roller press to gradually adjust the gap for repeated rolling. During the rolling process, auxiliary heating is carried out at the same time to increase the flexibility of the graphite. Roll until The thickness of the graphite sheet is 0.05mm, and the process is as follows figure 1 and figure 2 As shown, the expanded graphite flakes are obtained.

[0090] Mix 96.85% of acetylene black (conductive agent, particle size: about 10nm), 1.55% of CMC (sodium carboxymethyl cellulose), and 1.60% of SBR (styrene-butadiene rubber) to form a paste slurry. Spread the pasty slurry evenly on the aluminum foil with a thickness of 0.01 mm. Then evenly cover the expanded graphite flakes on the spread paste slurry, and the spread thickness is 0.08mm, and then vacuum-dry the covered wet expanded graphite-aluminum composite flakes at r...

Embodiment 2

[0092] Example 2 Preparation of flaky graphene by spray electrolysis microwave method

[0093] Take a piece of flexible expanded flake graphite, wash and dry it, and use a roller press to gradually adjust the gap for repeated calendering. During the calendering process, auxiliary heating is carried out at the same time to increase the flexibility of the graphite, and calender until the thickness of the graphite flake is 0.025mm. The process is as follows: figure 2 As shown, the expanded graphite flakes are obtained.

[0094] Arc spray the aluminum layer on the expanded graphite sheet obtained after calendering. The compressed air used for spraying should be clean and dry, the pressure should not be less than 0.4MPa, and the spraying distance should be 250mm. 45°, the moving speed of the spray gun should reach 50 μm in one spraying thickness, there should be 1 / 3 of the width overlap between the spraying strips, the thickness should be as uniform as possible, the spraying guns ...

Embodiment 3

[0097] Example 3 Preparation of flaky graphene by hot pressing electrolytic microwave method

[0098] Take a piece of flexible expanded flake graphite, wash and dry it, and use a roller press to gradually adjust the gap to carry out repeated calendering. During the calendering process, auxiliary heating is carried out at the same time to increase the flexibility of the graphite, and calender until the thickness of the graphite flake is 0.05mm. The process is as follows: figure 1 and figure 2 As shown, the expanded graphite flakes are obtained.

[0099] Heat and press the expanded graphite flakes obtained after calendering in contact with the aluminum flakes. The heating temperature is 650°C, and the pressure is 5 MPa to make the aluminum flakes plastically deform so that they can be bonded to the expanded graphite flakes to obtain expanded graphite-aluminum. Composite flakes.

[0100] Use the expanded graphite-aluminum composite sheet as the anode, use 10M sulfuric acid aqu...

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Abstract

The invention relates to a preparation method of a flake graphene and a flake graphene device prepared by the same. The preparation method is characterized in that expanded graphite flakes are obtained from flake graphite as a raw material by virtue of expanding and rolling, and then laminated on a metal sheet, the compound sheet serves as a working electrode in an electrolyte solution and is electrified to obtain a graphite interlayer compound which is relatively low in valence number and relatively high in yield, and finally, the graphite interlayer compound is stripped to obtain the flake graphene device with a matrix metal or non-metal conductor and a semiconductor. At least one side of the graphene prepared by use of the method is tightly adhered to the matrix metal or non-metal conductor and the semiconductor in the flake form; the device has excellent electrical conductivity and thermal conductivity and a huge specific surface area. The preparation method of the flake graphene has the advantages of wide raw material source, low cost, simplicity and environmental friendliness; the method is capable of directly obtaining the graphene device wide in application range, and thus is suitable for large-scale popularization, application and production.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular, the invention relates to a method for preparing graphene flakes and a graphene flake device prepared by the method. Background technique [0002] Graphene is a newly recognized allotrope of carbon after fullerene and carbon nanotubes. Graphene is a carbon atom with sp 2 A carbon material with a single-layer two-dimensional honeycomb lattice structure formed by hybrid orbital bonding and a six-membered ring structure. This unique structure of graphene brings it a series of novel and special properties, such as colorless and transparent (absorbed light intensity is only 2.3%), high conductivity (single-layer graphene conductivity is similar to that of copper), Excellent mechanical properties (tensile strength can reach 50-200GPa, elastic modulus can reach 1TPa, and the tensile strength of single-layer graphene is 100 times that of steel sheet of the same thickness). The above cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 王坚王叶帆
Owner YANCHENG TEACHERS UNIV
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