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A kind of preparation method of highly oriented graphene film

A graphene film, high orientation technology, applied in graphene, chemical instruments and methods, nano-carbon and other directions, can solve the orientation and arrangement regulation of graphene liquid crystal system, it is difficult to achieve large-scale, regular structure graphene film, orderly It is difficult to maintain and continue the macroscopic film, so as to achieve the effect of low cost, quick and easy operation, and wide source of raw materials.

Active Publication Date: 2020-12-11
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the preparation of many graphene films utilizes the order of graphene or graphene oxide to spontaneously form liquid crystals, and does not further regulate the orientation and arrangement of the graphene liquid crystal system itself. Difficult to maintain and continue
Large-scale, well-organized, and highly oriented graphene films are difficult to achieve by these methods
Fabrication of structured, high-performance, highly oriented graphene films remains a challenge

Method used

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  • A kind of preparation method of highly oriented graphene film
  • A kind of preparation method of highly oriented graphene film
  • A kind of preparation method of highly oriented graphene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) 2g of graphene and 50g of N-methylpyrrolidone, at 30°C with 50KHz ultrasonic treatment for 2 hours, to obtain a graphene solution;

[0038] (2) the graphene dispersion liquid that step (1) is obtained is placed in the container with electrode, is 1000Hz by frequency, and the applied electric field that intensity is 5000V / m is oriented to solution 100 minutes, obtains the highly oriented graphene dispersion liquid;

[0039] (3) by the highly oriented graphene dispersion that step (2) obtains, keep the effect of electric field on it and dry, obtain highly oriented graphene film;

[0040] Such as image 3 As shown, through the above steps, the prepared graphene film thickness is 10 microns, the tensile strength is 480MPa, the elongation at break is 4%, the electrical conductivity is greater than 10000S / m, and the thermal conductivity is 1500W / mK. toughness.

Embodiment 2

[0042] (1) Treat 2 g of graphene and 120 g of N-methylpyrrolidone at 25° C. with 30 KHz ultrasound for 1 hour to obtain a graphene solution.

[0043] (2) the graphene dispersion that step (1) is obtained is placed in the container with electrode, is 200Hz by frequency, and the applied electric field that strength is 400V / m is oriented to solution 70 minutes, obtains the highly oriented graphene dispersion;

[0044] (3) by the highly oriented graphene dispersion that step (2) obtains, keep the effect of electric field on it and dry, obtain highly oriented graphene film;

[0045] After the above steps, the prepared graphene film has a thickness of 80 microns, a tensile strength of 180 MPa, an elongation at break of 6%, a conductivity greater than 10,000 S / m, a thermal conductivity of 1,000 W / mK, and good toughness.

Embodiment 3

[0047] (1) Mix 0.1 g of graphene oxide and 3 g of deionized water, and process it at 20° C. with a 40 KHz ultrasonic wave for 10 hours to obtain a graphene oxide dispersion;

[0048] (2) Place the graphene oxide dispersion obtained in step (1) in a container with electrodes, and pass an applied electric field with a frequency of 1000 Hz and an intensity of 2000 V / m to orient the solution for 100 minutes to obtain highly oriented graphene oxide dispersion liquid;

[0049] (3) the highly oriented graphene oxide dispersion liquid that step (2) obtains, keep the effect of electric field on it and dry, obtain highly oriented graphene oxide film;

[0050](4) Reducing the graphene oxide film obtained in step (3) in a 20% sodium thiosulfate aqueous solution by mass fraction, washing and drying to obtain a highly oriented graphene film.

[0051] Through the above steps, the prepared graphene film has a thickness of 5 microns, a tensile strength of 900 MPa, an elongation at break of 3%...

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Abstract

The invention provides a method for preparing a high orientation graphene film. The method comprises the steps of first preparing a dispersion liquid of graphene or graphene oxide, placing the dispersion liquid of graphene or graphene oxide in a container with an electrode, obtaining a high orientation graphene or graphene oxide dispersion liquid through an additional electric field orientation method, continuing to maintain an electric field effect, drying the high orientation graphene or graphene oxide dispersion liquid, and obtaining a high orientation graphene film or graphene oxide film. The method has the advantages that a film manufacturing method is simple and convenient, a process is simple, the made graphene film is tidy in structure, has a very high degree of orientation, and can be applied to many fields.

Description

technical field [0001] The invention relates to the field of preparation of graphene films, in particular to a preparation method of highly oriented graphene films. Background technique [0002] Graphene has the highest strength and excellent electrical and thermal conductivity of known materials. It is currently the most ideal two-dimensional carbon nanomaterial and has broad application prospects in composite materials, electronic devices, energy storage and other fields (Science, 2008, 321, 385-388). Macroscopic graphene film is one of the main application forms of nanoscale graphene. [0003] The preparation of graphene films can be basically divided into two categories: synthesis and assembly. The synthesis method refers to the preparation of graphene films with nanoscale thickness by chemical vapor deposition, epitaxial growth and chemical synthesis. The assembly method refers to the preparation of graphene raw materials by mechanical exfoliation method, ball millin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
CPCC01B2204/04C01B2204/22C01B2204/24C01B2204/26C01P2004/03
Inventor 刘峥王勤生杨永强刘渊王荣霞文煜
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE