A kind of low wrinkle density graphene membrane and preparation method thereof
A graphene film, graphene film technology, applied in graphene, chemical instruments and methods, nano-carbon and other directions, can solve the problem of reducing the thermal conductivity and electrical conductivity of graphene film, reducing the density of graphene film, and closed pores cannot be excluded from the film. And other issues
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Embodiment 1
[0019] (1) Graphene oxide with an average size greater than 50 μm is prepared into a graphene oxide 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;
[0020] (2) Raise the temperature of the reduced graphene film to 400°C at a rate of 5°C / min, keep it warm for 2h and cool down naturally.
[0021] (3) Under the protection of an inert gas, the temperature of the above-mentioned graphene film was raised to 2400° C. at a rate of 1° C. / min, and kept for 0.5 h; a pressure of 5 MPa was applied during the whole process.
[0022] (5) After natural cooling, the graphene film is rolled and pressed under high pressure (200MPa) to obtain a low-wrinkle heat-conducting graphene film, and the speed ratio of the two roller systems is 1.05:1.
[0023] The prepared graphene film density is 2-2.2g / cm 3 , I D / T G 2 , The elongation at break is 13.6%, the strength is 57MPa, it can withstand repeat...
Embodiment 2
[0025] (1) Graphene oxide with an average size greater than 50 μm is prepared into a graphene oxide aqueous solution with a concentration of 16 mg / mL, and the solution is naturally dried after film formation, and then reduced with a reducing agent;
[0026] (2) Raise the temperature of the reduced graphene film to 350°C at a rate of 1°C / min, keep it warm for 1h and cool down naturally.
[0027] (3) Under the protection of an inert gas, the temperature of the above-mentioned graphene film was raised to 3000°C at a rate of 5°C / min, and kept for 0.5h; a pressure of 15MPa was applied during the whole process.
[0028] (5) After natural cooling, the graphene film is rolled and pressed under high pressure (250MPa) to obtain a low-wrinkle heat-conducting graphene film, and the speed ratio of the two roller systems is 1.05:1.
[0029] The prepared graphene film density is 2-2.2g / cm 3 , I D / T G 2 , The elongation at break is 10.5%, the strength is 64MPa, it can withstand repeated b...
Embodiment 3
[0031] (1) Graphene oxide with an average size greater than 50 μm is formulated into a graphene oxide aqueous solution with a concentration of 30 mg / mL, and the solution is naturally dried after film formation, and then reduced with a reducing agent;
[0032] (2) Raise the temperature of the reduced graphene film to 300°C at a rate of 0.1°C / min, keep it warm for 2h and cool down naturally.
[0033] (3) Under the protection of an inert gas, the temperature of the above-mentioned graphene film was raised to 3000°C at a rate of 10°C / min, and kept for 0.5h; a pressure of 40MPa was applied during the whole process.
[0034] (5) After natural cooling, the graphene film is rolled and pressed under high pressure (300MPa) to obtain a low-wrinkle heat-conducting graphene film, and the speed ratio of the two roller systems is 1.05:1.
[0035] The prepared graphene film density is 2-2.2g / cm 3 , I D / T G 2 , The elongation at break is 7%, the strength is 93MPa, it can withstand repeated...
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