Graphene-loaded nanometer Fe<3>O<4>/ZnO composite and preparation method thereof
A technology of graphene nanosheets and composite materials, which is applied in the field of graphene-loaded nano-Fe3O4/ZnO composite materials and its preparation, can solve the problems that the low-frequency magnetic field shielding effect cannot be achieved, and the shielding mechanism is only due to dielectric loss. Industrialized production and application, easy industrialized production and application, good electrical conductivity
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Embodiment 1
[0026] (1) Take Zn powder and FeCl with a mass ratio of 0.04:1 3 ·6H 2 Add O into deionized water, stir for 0.5h in a water bath environment at 50°C, and the stirring speed is 200r / min. After mixing evenly, add NaOH solution dropwise to adjust the pH of the mixture to 9, and continue stirring for more than 30min until the mixture is evenly mixed. ; The Zn powder is granular or flaky, the mesh number is greater than 400 mesh, the Zn content is greater than 90%, FeCl 3 ·6H 2 O solution concentration is 0.01mol / L.
[0027] (2) According to FeCl 3 ·6H 2 O: Graphene oxide with a mass ratio of 1.75:1 Weigh graphene oxide and dissolve it in deionized water to obtain a graphene oxide aqueous solution with a mass concentration of 0.05%, add it to the suspension in step (1), and stir evenly ,stand-by.
[0028] (3) The mixed solution obtained in step (2) was placed in a closed reaction kettle, and hydrothermally reacted at a temperature of 160° C. for 12 hours.
[0029] (4) Take o...
Embodiment 2
[0032] (1) Take Zn powder and FeCl with a mass ratio of 0.08:1 3 ·6H 2 O was added to deionized water, stirred in a water bath at 30°C for 1 hour, and the stirring speed was 500 r / min. After mixing evenly, drop in KOH solution to adjust the pH of the mixture to 12, and continue stirring for more than 30 minutes until the mixture was evenly mixed; The Zn powder is granular or flaky, with a mesh size greater than 400 mesh, a Zn content greater than 90%, FeCl 3 ·6H 2 O solution concentration is 0.1mol / L.
[0033] (2) According to FeCl 3 ·6H 2 O: The mass ratio of graphene oxide is 7:1. Weigh graphene oxide and dissolve it in deionized water to obtain a graphene oxide aqueous solution with a mass concentration of 3%. Add it to the suspension in step (1) and stir evenly ,stand-by.
[0034] (3) The mixed solution obtained in step (2) was placed in a closed reaction kettle, and subjected to hydrothermal reaction at a temperature of 180° C. for 5 hours.
[0035] (4) Take out th...
Embodiment 3
[0038] (1) Take Zn powder and FeCl with a mass ratio of 0.04:1 3 ·6H 2 Add O into deionized water, stir for 1.5h in a water bath environment at 40°C, and stir at a speed of 500r / min. After mixing evenly, drop Na 2 CO 3Solution, adjust the pH of the mixed solution to 10, continue to stir, and the duration is longer than 30min, until the mixing is uniform; the Zn powder is granular or flake, the mesh number is greater than 400 mesh, the Zn content is greater than 90%, and the FeCl 3 ·6H 2 O solution concentration is 2mol / L.
[0039] (2) According to FeCl 3 ·6H 2 O: The mass ratio of graphene oxide is 10.5:1. Weigh graphene oxide and dissolve it in deionized water to obtain a graphene oxide aqueous solution with a mass concentration of 2%. Add it to the suspension in step (1) and stir evenly ,stand-by.
[0040] (3) The mixed solution obtained in step (2) was placed in a closed reaction kettle, and hydrothermally reacted at a temperature of 200° C. for 12 hours.
[0041] (...
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