Preparation method of reduced graphene oxide/nickel oxide composite wave absorbing material
A composite wave-absorbing material, graphene technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve light weight, improve reflection loss, and achieve the effect of impedance matching
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Embodiment 1
[0030] 1. Preparation of graphene oxide
[0031] Graphene oxide was prepared by the modified Hummers method as the precursor of composite absorbing materials.
[0032] The specific preparation method is: take by weighing 3g of graphite, mix with 1.5g of sodium nitrate, measure 150mL of sulfuric acid and slowly add in the above solid, ice bath and slowly add 9.0g of potassium permanganate under magnetic stirring, this process Continue for about 2 hours; remove the ice bath, bathe in water at 35°C for about 5 days, slowly add 140mL of water, then add 350mL of water after 30 minutes, slowly add 20mL of 30% hydrogen peroxide, the solution gradually turns dark yellow; the above solution Centrifuge and wash with water for several times, take the lower layer and sonicate for 2 hours, then centrifuge at 8000 rpm to get the upper layer, dialyze for 15 days, and freeze-dry.
[0033] 1. Preparation of graphene oxide / nickel acetate mixture
[0034] (1) Weigh 100 mg of gra...
Embodiment 2
[0041] 1, the preparation of graphene oxide is the same as embodiment 1.
[0042] 2. Preparation of graphene oxide / nickel acetate mixture
[0043] (1) Weigh 100 mg of graphene oxide, ultrasonically disperse it in 50 mL of water, and prepare a 2 mg / mL aqueous solution;
[0044] (2) Weigh 100 mg of nickel acetate tetrahydrate, add to the above solution under magnetic stirring and fully dissolve;
[0045] (3) After fully dissolving, sonicate for half an hour;
[0046] (4) The obtained mixed solution was frozen and then dried.
[0047] 3. Preparation of graphene oxide / nickel oxide composite absorbing material
[0048]The above freeze-dried graphene oxide / nickel acetate mixture was taken out, put into a porcelain boat, and heated in an argon atmosphere of a tube furnace. The heating rate was 5 °C / min, and when the temperature was raised to 400 °C, it was kept for 2 h, and then the temperature was lowered at a rate of 5 °C / min. After cooling down to room temper...
Embodiment 3
[0050] 1, the preparation of graphene oxide is the same as embodiment 1.
[0051] 2. Preparation of graphene oxide / nickel acetate mixture
[0052] (1) Weigh 100 mg of graphene oxide, ultrasonically disperse it in 50 mL of water, and prepare a 2 mg / mL aqueous solution;
[0053] (2) Weigh 50 mg of nickel acetate tetrahydrate, add to the above solution under magnetic stirring and fully dissolve;
[0054] (3) After fully dissolving, sonicate for half an hour;
[0055] (4) The obtained mixed solution was frozen and then dried.
[0056] 3. Preparation of graphene oxide / nickel oxide composite absorbing material
[0057] The above freeze-dried graphene oxide / nickel acetate mixture was taken out, put into a porcelain boat, and heated in an argon atmosphere of a tube furnace. The heating rate was 3 °C / min, and when the temperature was raised to 600 °C, it was kept for 2 h, and then the temperature was lowered at a rate of 3 °C / min. After cooling down to room temp...
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