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Method for preparing graphene film by ultra-high pressure thermal reduction

A graphene film and graphene film technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of reducing thermal conductivity, affecting stability and durability, serious energy consumption, etc., and achieve high electrical conductivity and thermal conductivity, structure Dense, perfectly structured effect

Active Publication Date: 2018-03-06
HANGZHOU GAOXI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at present, the macroscopic assembly of graphene membranes requires a high-temperature sintering process of 3000 degrees.
This process consumes a lot of energy, easily damages the furnace body, and is prone to safety accidents; and the high-temperature process

Method used

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  • Method for preparing graphene film by ultra-high pressure thermal reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The single-layer graphene oxide is prepared into an aqueous solution with a concentration of 6 mg / mL, and the solution is naturally dried after film formation, and then reduced with a reducing agent.

[0022] (2) Heat the reduced graphene film to 300°C at a rate of 0.1°C / min under a hot press, keep it warm for 2h and cool down naturally; the pressure is maintained at 5GPa throughout the process.

[0023] (3) The above-mentioned graphene film was heated up to 1500° C. at a rate of 1° C. / min in an inert gas atmosphere, and kept for 6 hours; the pressure was maintained at 10 GPa throughout the process.

[0024] The obtained graphene film has an AB structure content of 95%, and an electrical conductivity of 9300 S / cm.

Embodiment 2

[0026] (1) The single-layer graphene oxide is prepared into an aqueous solution with a concentration of 30 mg / mL, and the solution is naturally dried after forming a film, and then reduced with a reducing agent.

[0027] (2) Heat the reduced graphene film to 400°C at a rate of 5°C / min under a hot press, keep it warm for 0.5h and cool down naturally; the pressure is maintained at 0.5GPa throughout the process.

[0028] (3) The above-mentioned graphene film was heated up to 1800° C. at a rate of 20° C. / min in an inert gas atmosphere, and kept for 0.5 h; the pressure was maintained at 3 GPa throughout the process.

[0029] The obtained graphene film has an AB structure content of 90%, and an electrical conductivity of 8500 S / cm.

Embodiment 3

[0031] (1) Prepare a few-layer graphene (1-10 layers) or graphite micro-nano sheet (thickness less than 100nm) into an aqueous solution with a concentration of 16 mg / mL, and dry the solution naturally after forming a film.

[0032] (2) The graphene film was heated up to 350°C at a rate of 1°C / min under a hot press, kept for 1h and cooled naturally; the pressure was maintained at 2GPa throughout the process.

[0033] (3) The above-mentioned graphene film was heated to 1600° C. at a rate of 10° C. / min in an inert gas atmosphere, and kept for 2 hours; the pressure was maintained at 5 GPa throughout the process.

[0034] The obtained graphene film has an AB structure content of 92.3%, and an electrical conductivity of 8800 S / cm.

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Abstract

The invention discloses a method for preparing a graphene film by ultra-high pressure thermal reduction. The graphene film is obtained by solution cast film, chemical reduction, the ultra-high pressure thermal reduction and the like of large-flake graphene oxide, few-layer graphene or nano-scale graphite microchip. The graphene film has the advantages of high orientation, compact structure and certain flexibility; and a graphene sheet layer has a perfect structure, hardly contains defects and has relatively-high electrical conductivity and thermal conductivity and thermal conductivity.

Description

technical field [0001] The invention relates to a novel heat-conducting and electrically-conducting material and a preparation method thereof, in particular to a method for preparing a graphene film by ultra-high pressure thermal reduction. 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 wave of research on graphene around the world. 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, ...

Claims

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Application Information

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IPC IPC(8): C01B32/184
Inventor 高超彭蠡
Owner HANGZHOU GAOXI TECH CO LTD
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