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Graphene film with ultrahigh flexibility and high thermal conductivity and preparation method of graphene film

A technology of high thermal conductivity graphite and graphene film, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of insufficient size of graphene oxide, unclear flexibility, and inability to meet the rapid development of science and technology, so as to improve the electrical conductivity Effects of thermal conductivity and wide application potential

Active Publication Date: 2016-04-27
杭州德烯科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at present, the size of graphene oxide itself is insufficient, and it contains a lot of fragments, so that it has not been developed enough in thermal conductivity, and its thermal conductivity is limited to 1400W / mK, which cannot meet the needs of rapid technological development.
Moreover, the lack of film structure design makes its flexibility unclear, which limits its application in flexible devices.

Method used

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  • Graphene film with ultrahigh flexibility and high thermal conductivity and preparation method of graphene film
  • Graphene film with ultrahigh flexibility and high thermal conductivity and preparation method of graphene film
  • Graphene film with ultrahigh flexibility and high thermal conductivity and preparation method of graphene film

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Embodiment 1

[0036] Example 1: Preparation of Graphene Oxide without Fragmentary Super Large Sheets

Embodiment 1-1

[0038] (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 1As 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 ).

[0039] (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 relative to the volume of 10 times the volume of the filtered product, leave it for 2h, slowly add H2O2, to remove exces...

Embodiment 1-2

[0042] 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, stop stirring, and react at low temperature (0°C,) for 48 hours. Obtain the reaction solution; the reaction solution is diluted with concentrated sulfuric acid with a mass fraction of more than 98% and dilute sulfuric acid with a mass fraction of 10% respectively, and then the graphite oxide crystals are filtered out with a titanium alloy mesh sieve with a 150um aperture (recovery of the reaction solution), and slowly poured into rapidly stirred ice water 10 times the volume of the filtered product, let it stand for 2h, and slowly added H 2 o 2 , to remove excess potassium permanganate in the reaction, add an appropriate amount of hydrochloric acid until the flocculent graphite oxide disappears, and then filter out the graphite oxide wafers with a titanium alloy mesh sieve; slowly shake and wash the sha...

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Abstract

The invention discloses a graphene film with ultrahigh flexibility and high thermal conductivity and a preparation method of the graphene film. The graphene film is prepared from an ultralarge uniform graphene oxide sheet through steps of solution film-formation, chemical reduction, high-temperature reduction, high-pressure compression and the like. The graphene film is formed through physical crosslinking of macroscopic multi-layer folded graphene with microscale folds, and inter-lamella slippage can be realized, so that the graphene film has ultrahigh flexibility. The graphene lamellar structure of the graphene film is perfect, the lamellas have ultralarge crystalline areas which are about 100 mu m and contain few defects, the structure is compact after high-pressure compression, and the graphene film has ultrahigh electrical conductivity and thermal conductivity. The graphene film with ultrahigh flexibility and high thermal conductivity can be bent repeatedly more than 1,200 times, the elongation at break is 12%-18%, the electrical conductivity is 8,000-10,600 S / cm, the thermal conductivity is 1,800-2,600 W / mK, and the graphene film can be used as a high-flexibility, thermal-conducting and electric-conducting device.

Description

technical field [0001] The invention relates to a novel heat-conducting material and a preparation method thereof, in particular to an ultra-flexible high-heat-conduction graphene film and a preparation method thereof. Background technique [0002] In 2010, two professors Andre Geim and Konstantin Novoselov from the University of Manchester won the Nobel Prize in Physics for their first successful separation of stable graphene, which set off a worldwide wave of research on graphene. Graphene has excellent electrical properties (electron mobility at room temperature can reach 2×10 5 m 2 / Vs), outstanding thermal conductivity (5000W / (MK), extraordinary specific surface area (2630M 2 / g), its Young's modulus (1100GPa) and breaking strength (125GPa). The excellent electrical and thermal conductivity of graphene completely exceeds that of metals. At the same time, graphene has the advantages of high temperature resistance and corrosion resistance, and its good mechanical prope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/26C01B2204/24C01B2204/04C01P2002/82C01P2004/22C01P2004/03C01P2006/10C01P2004/61C01P2006/32C01B32/192C01B32/198
Inventor 高超彭蠡姜炎秋刘英军
Owner 杭州德烯科技集团有限公司
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