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) After forming a 6mg / mL graphene oxide aqueous solution with a film scraper, dry it into a graphene oxide film with a thickness of 5um;
[0018] (2) The dried graphene oxide film is reduced in an aqueous solution of hydroiodic acid, and the reduced graphene film is washed with ethanol to remove the surface hydroiodic acid, and then dried naturally to obtain a dense chemically reduced graphene film . Among them, the HI content of the hydroiodic acid aqueous solution is 15wt%, the reduction temperature is 80 degrees Celsius, and the reduction time is 6h.
[0019] (3) The obtained graphene film is sintered in a graphite furnace at a sintering temperature of 1700 degrees Celsius and a time of 12 hours to obtain a crease-free elastic graphene film.
[0020] The prepared graphene film has a breaking elongation rate of 50%, an elastic vertical compression rate of 90%, and a conductivity of 7000 S / cm.
Embodiment 2
[0022] (1) A 10mg / mL graphene oxide aqueous solution is formed with a film scraper and then dried into a graphene oxide film with a thickness of 1.7um;
[0023] (2) The dried graphene oxide film is reduced in an aqueous solution of hydroiodic acid, and the reduced graphene film is washed with ethanol to remove the surface hydroiodic acid, and then dried naturally to obtain a dense chemically reduced graphene film . Among them, the HI content of the hydroiodic acid aqueous solution is 35wt%, the reduction temperature is 80 degrees Celsius, and the reduction time is 8h.
[0024] (3) Place the obtained graphene film in a graphite furnace for sintering at a sintering temperature of 600 degrees Celsius and a time of 2 hours to obtain a crease-free elastic graphene film.
[0025] figure 1 Clarified its fold structure and provided the basis for its tensile properties ( figure 2 ), the elongation at break is 30%, the elastic vertical compression rate is 82%, and the electrical conductivit...
Embodiment 3
[0027] (1) The 8mg / mL graphene oxide aqueous solution is formed with a film scraper and then air-dried to form a graphene oxide film with a thickness of 4um;
[0028] (2) The dried graphene oxide film is reduced in an aqueous solution of hydroiodic acid, and the reduced graphene film is washed with ethanol to remove the surface hydroiodic acid, and then dried naturally to obtain a dense chemically reduced graphene film . Among them, the HI content of the hydroiodic acid aqueous solution is 20wt%, the reduction temperature is 120 degrees Celsius, and the reduction time is 6h.
[0029] (3) The obtained graphene film is sintered in a graphite furnace at a sintering temperature of 600 degrees Celsius and a time of 12 hours to obtain a crease-free elastic graphene film.
[0030] The prepared graphene film has a breaking elongation rate of 33%, an elastic vertical compression rate of 90%, and a conductivity of 7000 S / cm.
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