Graphene ramification-carbon nanotube composite material and preparation method thereof
A technology of carbon nanotubes and composite materials, applied in the fields of nanostructure manufacturing, nanotechnology, nanotechnology, etc.
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[0035] see figure 1 , the preparation method of the graphene derivative-carbon nanotube composite material of an embodiment comprises the steps:
[0036] Step S110, providing or preparing graphene derivatives and carbon nanotubes.
[0037] The graphene derivative may be fluorinated graphene oxide or nitrogen-doped graphene oxide.
[0038] Fluorinated graphite oxide can be prepared by conventional methods. Preferably, the following method can be used to prepare:
[0039] Step S111, using graphite to prepare graphene oxide.
[0040] (a), graphite, potassium persulfate and phosphorus pentoxide are added in the concentrated sulfuric acid of 80~120 ℃ according to mass ratio 2~10:1:1, after stirring evenly, cool naturally, wash to neutrality and then dry, obtain mixture. The graphite is preferably flake graphite.
[0041] (b), add the mixture and potassium permanganate into concentrated sulfuric acid, keep the temperature of the mixed solution at 15-20°C, then put it in an oil...
Embodiment 1
[0063] (1) Provide natural flake graphite with a purity of 99.5%.
[0064] (2) Graphite oxide was prepared by the improved Hummers method. The specific steps are adding 20g of 50 mesh graphite powder, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stirring evenly, cooling for more than 6h, washing until neutral, and drying. Add the dried sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the mixture below 20°C, then keep it in an oil bath at 35°C for 2h, then slowly add 920mL of deionized water . After 15 minutes, add 2.8L of deionized water (which contains 50mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration while hot, and then wash with 5L of 10% hydrochloric acid, suction filtration, Graphite oxide was obtained by vacuum drying at 60°C for 48 hours.
[0065] (3) Put 20g of graphite oxide into a be...
Embodiment 2
[0070] (1) Provide natural flake graphite with a purity of 99.5%.
[0071] (2) Graphite oxide was prepared by the improved Hummers method. The specific steps are adding 20g of 50 mesh graphite powder, 10g of potassium persulfate and 10g of phosphorus pentoxide into concentrated sulfuric acid at 80°C, stirring evenly, cooling for more than 6h, washing until neutral, and drying. Add the dried sample to 230mL of concentrated sulfuric acid at 0°C, then add 60g of potassium permanganate, keep the temperature of the mixture below 20°C, then keep it in an oil bath at 35°C for 2h, then slowly add 920mL of deionized water . After 15 minutes, add 2.8L of deionized water (which contains 50mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration while hot, and then wash with 5L of 10% hydrochloric acid, suction filtration, Graphite oxide was obtained by vacuum drying at 60°C for 48 hours.
[0072] (3) Put 20g of graphite oxide into a be...
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