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Graphene film for light efficient electromagnetic shielding and preparation method thereof

A graphene film, electromagnetic shielding technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of different shielding performance, high shielding performance, low density, etc., achieve strong electromagnetic shielding performance, and improve electrical conductivity. , the effect of good electrical conductivity

Active Publication Date: 2016-07-06
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The graphene film prepared by this method has a high shielding effect, but the density is also high, greater than 0.6g / cm 3
Judging from the above frontier research results, one is that the shielding performance of metal materials is far from that of metal materials (the shielding effectiveness of metal materials is above 80dB), and the other is that materials with low density and high shielding performance have not yet been prepared.

Method used

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  • Graphene film for light efficient electromagnetic shielding and preparation method thereof
  • Graphene film for light efficient electromagnetic shielding and preparation method thereof
  • Graphene film for light efficient electromagnetic shielding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Preparation of Graphene Oxide without Fragmentary Super Large Sheets

[0039] Example 1-1

[0040] (1) Slowly add potassium permanganate into the rapidly stirring concentrated sulfuric acid at -10°C. After fully dissolving, add graphite, stir slowly at 60 rpm for 2 hours, then stop stirring. Reaction 6h, obtain the graphite oxide crystal of wide distribution respectively; As figure 1 As shown, there are more fragments in the graphite oxide wafers obtained under the two temperatures, which makes its corresponding graphene oxide also have a lot of fragments ( figure 2 ).

[0041] (2) The reaction solution obtained in step 1 is diluted with concentrated sulfuric acid (the dilution factor can be any multiple, and the present embodiment is diluted about 10 times), and the graphite oxide crystals are filtered out with a titanium alloy mesh sieve with a 150um aperture (140 mesh) (Reaction solution recovery), and slowly pour into rapidly stirred ice water relativ...

Embodiment 2

[0049] Embodiment 2: Using the non-fragmented super-large graphene oxide prepared in embodiment 1 to prepare a light and efficient graphene film for electromagnetic shielding.

[0050] Using 0.1mg / ml graphene oxide aqueous solution as raw material, adding mass fraction of 0.1% ammonium bicarbonate to the solution, after ultrasonic dispersion, the graphene oxide film was prepared by pouring and drying method, and then reduced with hydrazine hydrate, and then the reduced The graphene film is heated up gradually to 500 degrees at 1 degree per minute in an inert gas atmosphere, and kept for 0.5 hours. Gradually increase the temperature at 2°C / min to 3000°C for 0.5 hours to obtain a lightweight and efficient graphene film material for electromagnetic shielding.

[0051] The light and high-efficiency graphene film for electromagnetic shielding has a density of 0.005-0.1g / cm 3 , with holes aligned along the in-plane orientation of graphene and partially overlapped, such as Figure ...

Embodiment 3

[0055] Embodiment 3: Using the non-fragmented super large graphene oxide prepared in embodiment 1 to prepare a light and efficient graphene film for electromagnetic shielding.

[0056] Using 100mg / ml graphene oxide aqueous solution as raw material, add 5% urea in mass fraction to the solution, after ultrasonic dispersion, prepare graphene oxide film by scraping film drying method, then reduce it with hydrazine hydrate, and then reduce the reduced graphite The graphene films were heat-treated in the heat treatment methods shown in Table 1 to Table 3 under an inert gas atmosphere to obtain light-weight and high-efficiency graphene film materials for electromagnetic shielding.

[0057] Table 1: Different heating conditions in the first step

[0058]

[0059] It can be seen from Table 1 that the performance of this material is mainly determined by two aspects. One is the repair of the graphene oxide sheet structure inside the material, that is, the loss of functional groups and...

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Abstract

The invention discloses a graphene film for light efficient electromagnetic shielding and a preparation method thereof. An oversized graphene oxide sheet is used for forming the film and by virtue of an annealing mode under high temperature, the graphene defect is perfectly repaired, the edge defect is reduced to the lowest to form a perfect large conjugate structure, and the smoothness of a head conducting path of the graphene is guaranteed; furthermore, through three steps of independent warming processes, a functional group is separated from the surface of the graphene step by step, a pore-foaming agent included between the graphene sheets is slowly decomposed, and the functional group and the pore-forming agent are released step by step in a gas mode; and meanwhile, the graphitization process is gradually developed to form a graphene micro airbag; in the forming process of the micro gasbag, the most stable functional group on the surface of the graphene falls off, thereby producing the graphene structure formed by 1-4 layers of graphene sheets with the gas expansion under high temperature; the successful introduction of the graphene few-layer structure greatly promotes the conductivity performance of the material. The micro gasbag structure is assisted by good conductivity performance so that the graphene of the invention has strong electromagnetic shielding performance.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a light-weight and high-efficiency graphene film for electromagnetic shielding 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 attent...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/22C01B2204/24C01B2204/32C01P2002/85C01P2004/03
Inventor 李友良高超陈国贵孙海燕冯金茂彭蠡席嘉彬
Owner HANGZHOU GAOXI TECH CO LTD
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