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Pure graphene composite electromagnetic shielding film and method for preparing same

An electromagnetic shielding film and graphene composite technology, applied in the direction of magnetic field/electric field shielding, electrical components, etc., to achieve the effect of increased porosity, strong electromagnetic shielding performance, and simple process

Active Publication Date: 2016-12-07
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under the same density, the shielding efficiency per unit thickness still has room for improvement

Method used

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  • Pure graphene composite electromagnetic shielding film and method for preparing same
  • Pure graphene composite electromagnetic shielding film and method for preparing same
  • Pure graphene composite electromagnetic shielding film and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Graphene oxide microspheres were obtained by spraying and drying a graphene oxide aqueous solution with a concentration of 4 mg / mL. The atomization drying temperature is 120°C

[0032] (2) The graphene oxide microspheres obtained in step (1) were rapidly heated to 800°C at 20°C / min and maintained for 10 minutes, and then heated to 3000°C at 5°C / min for graphitization.

[0033] Through the above steps, the obtained high specific surface area multi-fold hollow graphene microspheres have a diameter of 3 μm, such as Figure 5 shown. Its specific surface area is 600m 2 / g, the graphene sphere wall is composed of four layers of graphene, such as Figure 6 shown.

[0034] (3) Graphene oxide with an average size greater than 100 μm is prepared into a concentration of 0.1 mg / ml graphene oxide aqueous solution, and 0.1% graphene microspheres of graphene oxide mass are added in the solution; Graphene oxide film was prepared by dry method, and then reduced with hydrazine h...

Embodiment 2

[0040] (1) The graphene oxide DMF solution with a concentration of 1 mg / mL was sprayed and dried to obtain graphene oxide microspheres. The atomization drying temperature is 100°C.

[0041] (2) The graphene oxide microspheres obtained in step (1) were rapidly heated to 1000°C at 15°C / min and maintained for 10 minutes, and then heated to 3000°C at 3°C / min for graphitization.

[0042] Through the above steps, the obtained high specific surface area multi-fold hollow graphene microspheres have a diameter of 5 μm. Its specific surface area is 1100m 2 / g.

[0043] (3) Graphene oxide with an average size greater than 100 μm is formulated into a graphene oxide aqueous solution with a concentration of 1 mg / ml, and 1% graphene microspheres of graphene oxide mass are added to the solution; after ultrasonic dispersion, dry by scraping film Graphene oxide film was prepared by the method, and then reduced with ascorbic acid.

[0044] (4) The obtained graphene film is first heated to 80...

Embodiment 3

[0049] (1) A graphene oxide methanol solution with a concentration of 10 mg / mL was sprayed and dried to obtain graphene oxide microspheres. The atomization drying temperature is 150°C

[0050] (2) The graphene oxide microspheres obtained in step (1) were rapidly heated to 1300°C at 18°C / min and maintained for 10 minutes, and then heated to 3000°C at 5°C / min for graphitization.

[0051] Through the above steps, the obtained high specific surface area multi-fold hollow graphene microspheres have a diameter of 4 μm. Its specific surface area is 1500m 2 / g.

[0052] (3) Graphene oxide with an average size greater than 100 μm is formulated into a graphene oxide aqueous solution with a concentration of 10 mg / ml, and 4% graphene microspheres of graphene oxide mass are added to the solution; after ultrasonic dispersion, it is prepared by a phase inversion method into a graphene oxide film and then reduced with hydrogen iodide.

[0053] (4) The obtained graphene film is first heate...

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Abstract

The invention discloses a pure graphene composite electromagnetic shielding film and a method for preparing the same. Graphene solid micro-spheres, hollow micro-spheres and lamellar graphene oxide are assembled to obtain the pure graphene composite electromagnetic shielding film. The pure graphene composite electromagnetic shielding film and the method have the advantages that defects of graphene are repaired by the aid of high-temperature annealing procedures, accordingly, perfect large conjugation structures can be formed, and the smoothness of conductive paths of the graphene can be guaranteed; functional groups on the graphene oxide can fall off to generate gas owing to the high-temperature annealing procedures, graphene lamellas can be peeled off under synergistic effects of the graphene micro-spheres, and multilevel porous structures can be formed; the multilevel porous structures are added to high-conductivity graphene substrates, and accordingly the pure graphene composite electromagnetic shielding film is extremely high in electromagnetic shielding performance.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a pure graphene composite electromagnetic shielding film and a preparation method thereof. Background technique [0002] With the rapid development of the electronic industry, the integration of electronic devices is getting higher and higher, the electromagnetic wave emission power of electronic devices is getting higher and higher, and the size of electronic devices is getting smaller and smaller. Electromagnetic waves emitted by electronic equipment not only affect the normal operation of their own equipment and other equipment, but may also have adverse effects on the human body and the natural environment. As a traditional material with high shielding performance, metal has the disadvantages of high density, easy corrosion, and difficult processing, so the development of new electromagnetic shielding materials has attracted extensive attention from academia and ...

Claims

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Application Information

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IPC IPC(8): C01B31/04H05K9/00
CPCC01P2004/03C01P2004/04C01P2004/61C01P2006/10C01P2006/12H05K9/0081
Inventor 高超彭蠡陈琛
Owner 杭州德烯科技集团有限公司
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