A kind of preparation method of crease-free elastic graphene film
A technology of elastic graphite and graphene film, which is applied in the field of new elastic graphene film materials, can solve the problems of thermal conductivity and electrical and thermal properties of graphene film, etc., and achieve the effect of improving the performance of wrinkled film and high vertical compression elasticity
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Embodiment 1
[0017] (1) 6mg / mL graphene oxide aqueous solution is used to form a film with a film scraper and then dried naturally to form a graphene oxide film with a thickness of 5um;
[0018] (2) the graphene oxide film after drying is reduced in hydroiodic acid aqueous solution, the graphene film after the reduction is washed with ethanol, to remove surface hydroiodic acid, then naturally dry, obtain dense chemically reduced graphene film . Wherein, the HI content of the hydroiodic acid aqueous solution is 15 wt%, the reduction temperature is 80 degrees Celsius, and the reduction time is 6 hours.
[0019] (3) Place the obtained graphene film in a graphite furnace for sintering, the sintering temperature is 1700 degrees centigrade, and the time is 12 hours, to obtain an elastic graphene film without creases.
[0020] The elongation at break of the prepared graphene film is 50%, the elastic vertical compressibility is 90%, and the electrical conductivity is 7000 S / cm.
Embodiment 2
[0022] (1) 10mg / mL graphene oxide aqueous solution is used to form a film with a film scraper and then dried naturally to form a graphene oxide film with a thickness of 1.7um;
[0023] (2) the graphene oxide film after drying is reduced in hydroiodic acid aqueous solution, the graphene film after the reduction is washed with ethanol, to remove surface hydroiodic acid, then naturally dry, obtain dense chemically reduced graphene film . Wherein, the HI content of the hydroiodic acid aqueous solution is 35 wt%, the reduction temperature is 80 degrees Celsius, and the reduction time is 8 hours.
[0024] (3) The obtained graphene film is placed in a graphite furnace for sintering, the sintering temperature is 600 degrees centigrade, and the time is 2h, to obtain an elastic graphene film without creases.
[0025] figure 1 Its wrinkled structure was elucidated, providing a basis for its tensile properties ( figure 2 ), the elongation at break is 30%, the elastic vertical compress...
Embodiment 3
[0027] (1) 8 mg / mL graphene oxide aqueous solution is formed into a film with a film scraper and then dried naturally to form a graphene oxide film with a thickness of 4um;
[0028] (2) the graphene oxide film after drying is reduced in hydroiodic acid aqueous solution, the graphene film after the reduction is washed with ethanol, to remove surface hydroiodic acid, then naturally dry, obtain dense chemically reduced graphene film . Wherein, the HI content of the hydroiodic acid aqueous solution is 20 wt%, the reduction temperature is 120 degrees Celsius, and the reduction time is 6 hours.
[0029] (3) Place the obtained graphene film in a graphite furnace for sintering, the sintering temperature is 600 degrees centigrade, and the time is 12 hours, to obtain an elastic graphene film without creases.
[0030] The prepared graphene film has an elongation at break of 33%, an elastic vertical compressibility of 90%, and a conductivity of 7000 S / cm.
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