CN111454579A - Nano nickel ferrite loaded graphene-based wave-absorbing material and preparation method thereof - Google Patents
Nano nickel ferrite loaded graphene-based wave-absorbing material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of wave-absorbing materials, and discloses a nano nickel ferrite loaded graphene-based wave-absorbing material which comprises the following formula raw materials and components: phosphorus-doped graphene oxide and nano-porous NiFe2O4And paraffin wax in the weight ratio of 0.2-0.6 to 0.4-0.8 to 1. According to the nano nickel ferrite loaded graphene-based wave-absorbing material, NiFe bimetal MOFs high-temperature thermal cracking is carried out to prepare porous nano NiFe2O4The phosphorus-doped graphene oxide composite material and phosphorus-doped graphene oxide form a composite material, phosphorus doping can improve the conductivity of the graphene oxide, more current carriers can be introduced, the electrical loss capacity of the composite material can be enhanced, structural defects are generated by the phosphorus doping, the interface polarization effect of the material is enhanced, the phosphorus-doped graphene with excellent conductivity and the nano NiFe with excellent magnetic performance are obtained2O4Good impedance matching performance is formed, and the absorbed electromagnetic wave is added into the nano NiFe2O4And a large number of pore structures are continuously reflected, so that the wave absorbing performance of the composite material is enhanced under the synergistic effect.
Description
Technical Field
The invention relates to the technical field of wave-absorbing materials, in particular to a nano nickel ferrite loaded graphene-based wave-absorbing material and a preparation method thereof.
Background
Electromagnetic waves with electromagnetic radiation characteristics comprise radio waves, microwaves, infrared rays, visible light, ultraviolet rays and the like, precision electronic instruments such as notebook computers, GPS, mobile phones, aircraft navigation systems, medical equipment and the like are interfered by the electromagnetic waves, normal use of the instruments is influenced, the electromagnetic radiation damages human bodies mainly through heat effects, non-heat effects and accumulation effects, and diseases such as immunity reduction, metabolism disorder, memory loss and the like of the human bodies are caused by damage to central nervous systems, organism immune systems, cardiovascular systems and the like of the human bodies after long-term reception of the electromagnetic radiation.
The wave-absorbing material can weaken and absorb the energy of electromagnetic waves projected to the surface, so that the interference of the electromagnetic waves is reduced, the wave-absorbing material can absorb and lose the electromagnetic waves through resistance type loss, dielectric loss, magnetic loss and the like, and the wave-absorbing material mainly comprises carbon series wave-absorbing materials such as graphene, carbon nano tubes, carbon fibers and the like; the iron-based wave-absorbing material comprises barium ferrite, nickel zinc ferrite and the like, wherein the nickel ferrite has good magnetic conductivity and soft magnetism, and can attenuate electromagnetic waves through magnetic loss, but the wave-absorbing material is difficult to achieve impedance matching performance only by the magnetic loss performance of the nickel zinc ferrite, so that the wave-absorbing performance is poor, the graphene has the advantages of high conductivity, large specific surface area, light weight and the like, and the iron-based wave-absorbing material is widely applied to the fields of electromagnetic shielding and electromagnetic wave absorption, can be combined with the graphene, and can improve the impedance matching performance and the wave-absorbing performance of the nickel ferrite material.
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a nano nickel ferrite loaded graphene-based wave-absorbing material and a preparation method thereof, and solves the problem that the impedance matching performance and the wave-absorbing performance of a nickel-zinc ferrite material are poor.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a nanometer nickel ferrite loaded graphene-based wave-absorbing material comprises the following formula raw materials and components: phosphorus-doped graphene oxide and nano-porous NiFe2O4And paraffin wax in the weight ratio of 0.2-0.6 to 0.4-0.8 to 1.
Preferably, the preparation method of the nano-porous NiFe2O4 comprises the following steps:
(1) adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2Heating the solution in a water bath to 40-60 ℃, uniformly stirring for 20-40min, transferring the solution into a reaction kettle, placing the solution into a reaction kettle heating box, heating to 120-150 ℃, reacting for 4-8h, filtering the solution to remove the solvent, washing the solid product by using distilled water and ethanol, and fully drying to prepare the NiFe bimetallic MOFs.
(2) Putting the NiFe bimetal MOFs into a muffle furnace, heating to 350 ℃ at the heating rate of 2-5 ℃/min, carrying out heat preservation treatment for 30-90min, heating to 520 ℃ at 480 ℃ and calcining for 1-2h to obtain the nano porous NiFe2O 4.
Preferably, the reation kettle heating cabinet includes heating box, heating box below fixedly connected with blast heater, blast heater swing joint have rotary rod, the rotatory fan piece of rotary rod fixedly connected with, the inside fixedly connected with agitating unit of heating box, and agitating unit swing joint has agitator shaft, agitator shaft swing joint have regulator, regulator and fixation clamp swing joint.
Preferably, the terephthalic acid, 3-diaminobenzidine and NiCl are used2And FeCl2The mass ratio of the substances is 16-20:0.5-0.8:1: 2.
Preferably, the preparation method of the nano nickel ferrite loaded graphene-based wave-absorbing material comprises the following steps:
(1) adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 40-80 ℃, performing ultrasonic dispersion treatment for 2-4h under 30-50KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 150-180 ℃, reacting for 8-15h, cooling the solution to room temperature, filtering to remove the solvent, washing the solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide.
(2) Adding a trichloromethane solvent, phosphorus-doped graphene oxide and nano-porous NiFe into a reaction bottle2O4And paraffin wax, stirring and dissolving, then carrying out ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mould, fully drying and tabletting to prepare a 1mm film, and thus obtaining the nano nickel ferrite loaded graphene-based wave-absorbing material.
(III) advantageous technical effects
Compared with the prior art, the invention has the following beneficial technical effects:
the nano nickel ferrite loaded graphene-based wave-absorbing material is prepared by taking terephthalic acid and 3, 3-diaminobenzidine as ligands, preparing NiFe bimetal MOFs through a hot solvent method, and preparing porous nano NiFe through high-temperature thermal cracking2O4And then the paraffin is used as a substrate to form a composite material with the phosphorus-doped graphene oxide, phosphorus doping can improve the conductivity of the graphene oxide, more current carriers can be introduced, the electrical loss capability of the composite material can be enhanced, and the carbon lattice of the graphene is damaged by the phosphorus doping, so that structural defects are generated, the interface polarization effect of the material is enhanced, the phosphorus-doped graphene with excellent conductivity and the nano NiFe with excellent magnetic property are obtained2O4Good impedance matching performance is formed, and the absorbed electromagnetic wave is added into the nano NiFe2O4And a large number of pore structures are continuously reflected, and the excellent wave absorbing performance is shown under the synergistic effect.
Drawings
FIG. 1 is a schematic front view of a heating cabinet;
FIG. 2 is an enlarged schematic view of the stirring device;
1. heating the box body; 2. a blower heater; 3. rotating the rod; 4. rotating the fan blade; 5. a stirring device; 6. a stirring bearing; 7. a stirring rod; 8. a regulator; 9. and (4) fixing clips.
Detailed Description
To achieve the above object, the present invention provides the following embodiments and examples: a nanometer nickel ferrite loaded graphene-based wave-absorbing material comprises the following formula raw materials and components: phosphorus-doped graphene oxide and nano-porous NiFe2O4And paraffin wax in the weight ratio of 0.2-0.6 to 0.4-0.8 to 1.
The preparation method of the nano-porous NiFe2O4 comprises the following steps:
(1) adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2The weight ratio of the four substances is 16-20:0.5-0.8:1:2, the solution is placed in a water bath kettle to be heated to 40-60 ℃, stirred at a constant speed for 20-40min, the solution is transferred into a reaction kettle, the reaction kettle heating box comprises a heating box body, a blast heater is fixedly connected below the heating box body, the blast heater is movably connected with a rotary rod, the rotary rod is fixedly connected with a rotary fan blade, a stirring device is fixedly connected in the heating box body, the stirring device is movably connected with a stirring bearing, the stirring bearing is movably connected with a stirring rod, the stirring rod is movably connected with a regulator, the regulator is movably connected with a fixing clamp, and placing the solution in a heating box of a reaction kettle, heating the solution to the temperature of 120-150 ℃, reacting for 4-8h, filtering the solution to remove the solvent, washing the solid product by using distilled water and ethanol, and fully drying to prepare the NiFe bimetallic MOFs.
(2) Putting the NiFe bimetal MOFs into a muffle furnace, heating to 350 ℃ at the heating rate of 2-5 ℃/min, carrying out heat preservation treatment for 30-90min, heating to 520 ℃ at 480 ℃, and calcining for 1-2h to obtain the nano porous NiFe2O4。
The preparation method of the nano nickel ferrite loaded graphene-based wave-absorbing material comprises the following steps:
(1) adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 40-80 ℃, performing ultrasonic dispersion treatment for 2-4h under 30-50KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 150-180 ℃, reacting for 8-15h, cooling the solution to room temperature, filtering to remove the solvent, washing the solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide.
(2) Adding a trichloromethane solvent, phosphorus-doped graphene oxide and nano-porous NiFe into a reaction bottle2O4And paraffin wax, stirring and dissolving, then carrying out ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mould, fully drying and tabletting to prepare a 1mm film, and thus obtaining the nano nickel ferrite loaded graphene-based wave-absorbing material.
Example 1
(1) Preparing a NiFe bimetal MOFs component 1: adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2The four substances are in a mass ratio of 16:0.5:1:2, the solution is placed in a water bath pot to be heated to 40 ℃, stirred at a constant speed for 20min, and transferred into a reaction kettle, a heating box of the reaction kettle comprises a heating box body, a blast heater is fixedly connected below the heating box body, the blast heater is movably connected with a rotating rod, the rotating rod is fixedly connected with a rotating fan sheet, a stirring device is fixedly connected inside the heating box body, the stirring device is movably connected with a stirring bearing, the stirring bearing is movably connected with a stirring rod, the stirring rod is movably connected with a regulator, the regulator is movably connected with a fixing clamp and is placed in the heating box of the reaction kettle to be heated to 120 ℃, the solution is heated to react for 4h, the solution is filtered to remove the solvent, a solid product is washed by using distilled water and ethanol, and is fully dried.
(2) Preparation of nanoporous NiFe2O4Component 1: putting the NiFe bimetal MOFs component 1 into a muffle furnace, heating to 300 ℃ at the heating rate of 2 ℃/min, carrying out heat preservation treatment for 30min, heating to 480 ℃ and calcining for 1h to obtain the nano porous NiFe2O4And (3) component 1.
(3) Phosphorus-doped graphene oxide component 1: adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 40 ℃, performing ultrasonic dispersion treatment for 2 hours under the condition of 30KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 150 ℃, reacting for 8 hours, cooling the solution to room temperature, filtering to remove the solvent, washing a solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide component 1.
(4) Preparing a nano nickel ferrite loaded graphene-based wave-absorbing material 1: adding a trichloromethane solvent, a phosphorus-doped graphene oxide component 1 and nano-porous NiFe into a reaction bottle2O4And stirring and dissolving the component 1 and paraffin in a mass ratio of 0.2:0.4:1, performing ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mold, fully drying and tabletting to prepare a 1mm film, and preparing the nano nickel ferrite loaded graphene-based wave-absorbing material 1.
Example 2
(1) Preparing a NiFe bimetal MOFs component 2: adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2And the mass ratio of the four substances is 20:0.5:1:2, the solution is placed in a water bath pot to be heated to 60 ℃, the solution is stirred at a constant speed for 20min and transferred into a reaction kettle, a heating box of the reaction kettle comprises a heating box body, a blast heater is fixedly connected below the heating box body, the blast heater is movably connected with a rotating rod, the rotating rod is fixedly connected with a rotating fan sheet, a stirring device is fixedly connected inside the heating box body, the stirring device is movably connected with a stirring bearing, the stirring bearing is movably connected with a stirring rod, the stirring rod is movably connected with a regulator, the regulator is movably connected with a fixing clamp and is placed in the heating box of the reaction kettle to be heated to 150 ℃, the reaction is carried out for 8h, the solution is filtered to remove the solvent, a solid product is washed by using distilled water and ethanol, and is fully dried.
(2) Preparation of nanoporous NiFe2O4And (2) component: placing NiFe bimetal MOFs component 2 in horseIn a muffle furnace, heating up to 300 ℃ at the heating rate of 2 ℃/min, carrying out heat preservation treatment for 90min, heating up to 480 ℃ and calcining for 2h to prepare the nano porous NiFe2O4And (3) component 2.
(3) Phosphorus-doped graphene oxide component 2: adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 80 ℃, performing ultrasonic dispersion treatment for 2 hours under the condition of 30KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 150 ℃, reacting for 8 hours, cooling the solution to room temperature, filtering to remove the solvent, washing a solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide component 2.
(4) Preparing a nano nickel ferrite loaded graphene-based wave-absorbing material 2: adding a trichloromethane solvent, a phosphorus-doped graphene oxide component 2 and nano-porous NiFe into a reaction bottle2O4And (3) stirring and dissolving the component 2 and paraffin wax in a mass ratio of 0.25:0.75:1, performing ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mold, fully drying and tabletting to prepare a 1mm film, and preparing the nano nickel ferrite loaded graphene-based wave-absorbing material 2.
Example 3
(1) Preparing a NiFe bimetal MOFs component 3: adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2The four substances are in a mass ratio of 18:0.65:1:2, the solution is placed in a water bath pot to be heated to 50 ℃, stirred at a constant speed for 30min, and transferred into a reaction kettle, a heating box of the reaction kettle comprises a heating box body, a blast heater is fixedly connected below the heating box body, the blast heater is movably connected with a rotating rod, the rotating rod is fixedly connected with a rotating fan blade, a stirring device is fixedly connected inside the heating box body, the stirring device is movably connected with a stirring bearing, the stirring bearing is movably connected with a stirring rod, the stirring rod is movably connected with a regulator, the regulator is movably connected with a fixing clamp and is placed in the heating box of the reaction kettle to be heated to 130 ℃, the solution is reacted for 6h, the solution is filtered to remove the solvent, the solid product is washed byDrying, and preparing the NiFe bimetal MOFs component 3.
(2) Preparation of nanoporous NiFe2O4And (3) component: putting the NiFe bimetal MOFs component 3 into a muffle furnace, heating to 330 ℃ at the heating rate of 4 ℃/min, carrying out heat preservation treatment for 60min, heating to 500 ℃ again, and calcining for 1.5h to obtain the nano porous NiFe2O4And (3) component.
(3) Phosphorus-doped graphene oxide component 3: adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 60 ℃, performing ultrasonic dispersion treatment for 3 hours under 40KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 160 ℃, reacting for 12 hours, cooling the solution to room temperature, filtering to remove the solvent, washing a solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide component 3.
(4) Preparing a nano nickel ferrite loaded graphene-based wave-absorbing material 3: adding a trichloromethane solvent, a phosphorus-doped graphene oxide component 3 and nano-porous NiFe into a reaction bottle2O4And (3) stirring and dissolving the component 3 and the paraffin wax in a mass ratio of 0.4:0.6:1, performing ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mold, fully drying and tabletting to prepare a 1mm film, and preparing the nano nickel ferrite loaded graphene-based wave-absorbing material 3.
Example 4
(1) Preparing a NiFe bimetal MOFs component 4: adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2The mass ratio of the four substances is 18:0.7:1:2, the solution is placed in a water bath pot to be heated to 40 ℃, stirred at a constant speed for 30min, and transferred into a reaction kettle, a heating box of the reaction kettle comprises a heating box body, a blast heater is fixedly connected below the heating box body, the blast heater is movably connected with a rotating rod, the rotating rod is fixedly connected with a rotating fan blade, a stirring device is fixedly connected inside the heating box body, the stirring device is movably connected with a stirring bearing, the stirring bearing is movably connected with a stirring rod, and the stirring rod is movably connected with an adjusting deviceAnd the device and the regulator are movably connected with the fixed clamp, are placed in a heating box of a reaction kettle, are heated to 150 ℃, react for 8 hours, filter the solution to remove the solvent, wash the solid product by using distilled water and ethanol, and fully dry to prepare the NiFe bimetal MOFs component 4.
(2) Preparation of nanoporous NiFe2O4And (4) component: putting the NiFe bimetal MOFs component 4 into a muffle furnace, heating to 310 ℃ at the heating rate of 4 ℃/min, carrying out heat preservation treatment for 4min, heating to 520 ℃ again, and calcining for 1h to obtain the nano porous NiFe2O4And (4) component.
(3) Phosphorus-doped graphene oxide component 4: adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 60 ℃, performing ultrasonic dispersion treatment for 3 hours under 40KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 160 ℃, reacting for 10 hours, cooling the solution to room temperature, filtering to remove the solvent, washing a solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide component 4.
(4) Preparing a nano nickel ferrite loaded graphene-based wave-absorbing material 4: adding a trichloromethane solvent, a phosphorus-doped graphene oxide component 4 and nano-porous NiFe into a reaction bottle2O4And stirring and dissolving the component 4 and the paraffin wax according to the mass ratio of 0.5:0.5:1, performing ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mold, fully drying and tabletting to prepare a 1mm film, and preparing the nano nickel ferrite loaded graphene-based wave-absorbing material 4.
Example 5
(1) Preparing a NiFe bimetal MOFs component 5: adding a mixed solvent of N, N-dimethylformamide and ethanol into a reaction bottle, adding ligand terephthalic acid and 3, 3-diaminobenzidine, stirring for dissolving, and adding NiCl2And FeCl2The mass ratio of the four substances is 20:0.8:1:2, the solution is placed in a water bath pot to be heated to 60 ℃, stirred at a constant speed for 40min, and transferred into a reaction kettle, a heating box of the reaction kettle comprises a heating box body, a blast heater is fixedly connected below the heating box body, the blast heater is movably connected with a rotating rod, and the rotating rod is fixedly connected with the rotating rodThe preparation method comprises the steps of fixedly connecting a stirring device with a rotating fan blade and the inside of a heating box body, wherein the stirring device is movably connected with a stirring bearing, the stirring bearing is movably connected with a stirring rod, the stirring rod is movably connected with an adjuster, the adjuster is movably connected with a fixing clamp, placing the stirring rod in the heating box of a reaction kettle, heating the stirring rod to 150 ℃, reacting for 8 hours, filtering a solution to remove a solvent, washing a solid product by using distilled water and ethanol, fully drying, and preparing the NiFe bimetal MOFs component 5.
(2) Preparation of nanoporous NiFe2O4And (5) component: putting the NiFe bimetal MOFs component 5 into a muffle furnace, heating to 350 ℃ at the heating rate of 5 ℃/min, carrying out heat preservation treatment for 90min, heating to 520 ℃ again, and calcining for 2h to obtain the nano porous NiFe2O4And (5) component.
(3) Phosphorus-doped graphene oxide component 5: adding distilled water solvent, graphene and sodium hypophosphite into a reaction bottle, placing the reaction bottle in an ultrasonic dispersion instrument, heating the reaction bottle to 80 ℃, performing ultrasonic dispersion treatment for 4 hours under 50KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the reaction bottle to 180 ℃, reacting for 15 hours, cooling the solution to room temperature, filtering to remove the solvent, washing a solid product by using distilled water and ethanol, and fully drying to prepare the phosphorus-doped graphene oxide component 5.
(4) Preparing a nano nickel ferrite loaded graphene-based wave-absorbing material 5: adding a trichloromethane solvent, a phosphorus-doped graphene oxide component 5 and nano-porous NiFe into a reaction bottle2O4And stirring and dissolving the component 5 and paraffin wax in a mass ratio of 0.6:0.4:1, performing ultrasonic dispersion treatment on the solution, pouring the solution into a film forming mold, fully drying and tabletting to prepare a 2mm film, and preparing the nano nickel ferrite loaded graphene-based wave-absorbing material 5.
The nano nickel ferrite loaded graphene-based wave-absorbing material prepared in the embodiment 1-5 is subjected to electromagnetic parameter and wave-absorbing performance tests by a TTR500 microwave vector network analyzer.
In summary, the nano nickel ferrite loaded graphene-based wave-absorbing material takes terephthalic acid and 3, 3-diaminobenzidine as ligands, NiFe bimetal MOFs is prepared by a hot solvent method, and porous nano NiFe is prepared by high-temperature thermal cracking2O4And then the paraffin is used as a substrate to form a composite material with the phosphorus-doped graphene oxide, phosphorus doping can improve the conductivity of the graphene oxide, more current carriers can be introduced, the electrical loss capability of the composite material can be enhanced, and the carbon lattice of the graphene is damaged by the phosphorus doping, so that structural defects are generated, the interface polarization effect of the material is enhanced, the phosphorus-doped graphene with excellent conductivity and the nano NiFe with excellent magnetic property are obtained2O4Good impedance matching performance is formed, and the absorbed electromagnetic wave is added into the nano NiFe2O4The wave absorbing material continuously reflects in a large number of pore structures, shows excellent wave absorbing performance under the synergistic effect, has the absorption frequency band of 12.0-16.4GHz, the bandwidth of 4.4GHz and the optimal reflection loss value of-53.1-58.2 dB.
Claims (5)
1. A nanometer nickel ferrite load graphene-based wave-absorbing material comprises the following formula raw materials and components, and is characterized in that: phosphorus-doped graphene oxide and nano-porous NiFe2O4And paraffin wax in the weight ratio of 0.2-0.6 to 0.4-0.8 to 1.
2. The nano-nickel ferrite loaded graphene-based wave-absorbing material according to claim 1, wherein: the preparation method of the nano-porous NiFe2O4 comprises the following steps:
(1) adding ligand terephthalic acid and 3, 3-diaminobenzidine into a mixed solvent of N, N-dimethylformamide and ethanol, and adding NiCl2And FeCl2Heating to 40-60 ℃, stirring for 20-40min, transferring the solution into a reaction kettle, placing the solution into a reaction kettle heating box, heating to 120-Filtering, washing and drying for 8h to prepare NiFe bimetal MOFs;
(2) putting the NiFe bimetal MOFs into a muffle furnace, heating to 350 ℃ at the heating rate of 2-5 ℃/min, carrying out heat preservation treatment for 30-90min, heating to 520 ℃ at 480 ℃ and calcining for 1-2h to obtain the nano porous NiFe2O 4.
3. The nano-nickel ferrite loaded graphene-based wave-absorbing material according to claim 2, wherein: the reation kettle heating cabinet includes heating box, heating box below fixedly connected with blast heater, blast heater swing joint have rotary rod, rotary rod fixedly connected with rotation fan piece, the inside fixedly connected with agitating unit of heating box, and agitating unit swing joint has agitator bearing, agitator bearing swing joint have puddler, puddler swing joint have regulator, regulator and fixation clamp swing joint.
4. The nano-nickel ferrite loaded graphene-based wave-absorbing material according to claim 2, wherein: the terephthalic acid, the 3, 3-diaminobenzidine and the NiCl2And FeCl2The mass ratio of the substances is 16-20:0.5-0.8:1: 2.
5. The nano-nickel ferrite loaded graphene-based wave-absorbing material according to claim 1, wherein: the preparation method of the nano nickel ferrite loaded graphene-based wave-absorbing material comprises the following steps:
(1) adding graphene and sodium hypophosphite into a distilled water solvent, placing the mixture into an ultrasonic dispersion instrument, heating the mixture to 40-80 ℃, performing ultrasonic dispersion treatment for 2-4h under the condition of 30-50KHz, transferring the solution into a reaction kettle, placing the reaction kettle in a heating box of the reaction kettle, heating the solution to 150-180 ℃, reacting for 8-15h, filtering, washing and drying to prepare phosphorus-doped graphene oxide;
(2) adding phosphorus-doped graphene oxide and nano-porous NiFe into trichloromethane solvent2O4And paraffin wax, stirring for dissolving, performing ultrasonic dispersion treatment, pouring the solution into a film forming mould, fully drying and pressingAnd preparing the sheet into a film with the thickness of 1mm, and preparing the nano nickel ferrite loaded graphene-based wave-absorbing material.
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