Graphene-coated magnetic nickel nanoparticle and preparation method thereof
A graphene-coated, magnetic nanotechnology, applied in the direction of the magnetism of inorganic materials, can solve the problems of easy oxidation of metal nanoparticles, low saturation magnetization, complex process, etc., and achieve high magnetic saturation value, good shape, and equipment technology. simple effect
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Embodiment 1
[0056] Stir 3g of LPAN solution (molecular weight 4000) at 120°C for 120h to form a microcyclized LPAN solution, heat-treat the microcyclized LPAN solution at 250°C for 8h to form a thermally oxidized polyacrylonitrile oligomer with a ladder structure (OPAN) solid, add 7.6g nickel oxide, 20ml solvent, and ball mill the sample with a planetary ball mill, the ball to material ratio is 7:1, 500rad / min ball mill for 10h, after discharging, dry in an oven at 230°C for 3h to get the pre-oxidized Body (i.e. low temperature carbonization precursor coated nickel compound). Put the thermal oxidation precursor in a porcelain boat, under the protection of an inert atmosphere, with a gas flow rate of 150ml / min, calcinate at 900°C for 4 hours, and cool to room temperature to obtain a graphene-coated nickel magnetic nanoparticle composite. The product structure is as follows: Figure 2a (SEM spectrum, scanning electron microscope spectrum), 2b (XRD spectrum, X-ray diffraction analysis spectr...
Embodiment ２
[0058] Stir 7.5g of LPAN solution (molecular weight 1600) at 100°C for 200h to form a microcyclized LPAN solution, and heat-treat the microcyclized LPAN solution at 300°C for 1h to form a thermally oxidized polyacrylonitrile with a ladder structure. Polymer (OPAN) solid, add 3.17g nickel oxide, 30ml solvent, and ball mill the sample with a planetary ball mill, the ball-to-material ratio is 7:1, 500rad / min ball mill for 10h, after discharging, dry in an oven at 230°C for 10h to obtain thermal oxidation Prebody. Put the thermal oxidation precursor in a porcelain boat, under the protection of an inert atmosphere, with a gas flow rate of 150ml / min, calcined at 1300°C for 4 hours, and cooled to room temperature to obtain a composite of graphene-coated nickel magnetic nanoparticles. The product structure is as follows: Figure 3a (SEM spectrum, scanning electron microscope spectrum), 3b (XRD spectrum, X-ray diffraction analysis spectrum).
Embodiment 3
[0060] Stir 3g of LPAN solution (molecular weight 25,000) at 200°C for 100h to form a microcyclized LPAN solution, heat-treat the microcyclized LPAN solution at 200°C for 10h to form a thermally oxidized polyacrylonitrile oligomer with a ladder structure (OPAN) solid, add 7.6g of nickel oxide, 15ml of solvent, and ball mill the sample with a planetary ball mill, the ball to material ratio is 7:1, 500rad / min ball mill for 10h, after discharging, dry in an oven at 230°C for 3h to get the pre-oxidized Body (i.e. low temperature carbonization precursor coated nickel compound). The thermal oxidation precursor was placed in a porcelain boat, under the protection of an inert atmosphere, the gas flow rate was 150ml / min, calcined at 700°C for 4h, and cooled to room temperature to obtain a graphene-coated nickel magnetic nanoparticle composite.
[0061] Compared with the traditional synthesis method, the present invention adopts the production method of graphene-coated metal particles, ...
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