CN115460897A - Magnetic/carbon composite material, preparation method thereof and application thereof in electromagnetic wave absorption - Google Patents
Magnetic/carbon composite material, preparation method thereof and application thereof in electromagnetic wave absorption Download PDFInfo
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- CN115460897A CN115460897A CN202210854852.1A CN202210854852A CN115460897A CN 115460897 A CN115460897 A CN 115460897A CN 202210854852 A CN202210854852 A CN 202210854852A CN 115460897 A CN115460897 A CN 115460897A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 57
- 239000002131 composite material Substances 0.000 title claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 18
- 239000012153 distilled water Substances 0.000 claims description 16
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- -1 potassium ferricyanide Chemical compound 0.000 claims description 10
- 239000002243 precursor Substances 0.000 claims description 10
- 239000001509 sodium citrate Substances 0.000 claims description 10
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 claims description 10
- 229940038773 trisodium citrate Drugs 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 5
- 239000002041 carbon nanotube Substances 0.000 claims description 5
- 229910003321 CoFe Inorganic materials 0.000 claims description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 230000010287 polarization Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000012188 paraffin wax Substances 0.000 description 8
- 239000000945 filler Substances 0.000 description 7
- 230000005670 electromagnetic radiation Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000012621 metal-organic framework Substances 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000003446 ligand Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004966 Carbon aerogel Substances 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229960003351 prussian blue Drugs 0.000 description 1
- 239000013225 prussian blue Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Abstract
The invention discloses a magnetic/carbon composite material, a preparation method thereof and application thereof in electromagnetic wave absorption, belonging to the field of stealth materials. The composite material has the advantages of simple preparation process, high yield, low cost, low density and the like, and is pressed into a ring to test the absorption performance of the composite material to electromagnetic waves. Due to the existence of multiple alloy components, the polarization loss and the magnetic loss of the material can be improved, the impedance matching is optimized, the attenuation capacity is improved, the reflection loss of the material is enhanced, the effective absorption bandwidth is widened, and the excellent electromagnetic wave absorption performance is obtained.
Description
Technical Field
The invention belongs to the technical field of stealth materials, and particularly relates to a magnetic/carbon composite material, a preparation method thereof and application thereof in electromagnetic wave absorption.
Background
With the development of science and technology, electronic products such as communication tools, medical instruments, military equipment and the like are continuously optimized. While these electronic devices provide great convenience to contemporary society, their power has also grown exponentially, and electromagnetic radiation on the ground has also increased significantly, so that the human living environment is flooded with a large number of electromagnetic radiation sources. Therefore, electromagnetic pollution has become one of the main pollutants following water pollution and air pollution. On the one hand, excessive electromagnetic radiation can lead to degradation and failure of the electronics. On the other hand, it is a great hazard to human life and health. Therefore, reducing electromagnetic radiation and establishing a safe environment are the primary problems, and more importantly, it is necessary to develop an absorber having high loss, wide bandwidth, low density, and thin thickness.
Graphene, carbon fibers, carbon nanotubes, carbon aerogel and other materials are used as ideal dielectric materials, and the dielectric material has the characteristics of high complex dielectric constant, low density, good stability and the like. Meanwhile, magnetic materials, such as magnetic metals and metal oxides, have been widely studied due to their high composite permeability and thin thickness. However, agglomeration and high density of magnetic particles are major problems that prevent their widespread use. Therefore, a magnetic metal/carbon composite material having both dielectric loss and magnetic loss has attracted attention of researchers. The metal organic framework material serving as a precursor of the carbon-based composite material has the advantages of controllable appearance, adjustable components and the like. Importantly, the polymetallic metal-organic framework material can be constructed by changing the metal type, and a metal alloy is generated after pyrolysis, so that the polarization loss and the magnetic loss are enhanced. In addition, due to the periodic arrangement of the ligands and metal ions, the metal particles are uniformly dispersed in carbon after carbonization, suppressing agglomeration as much as possible. These are advantageous in improving the microwave absorption performance. However, the high conduction loss and low magnetic content are not favorable for optimizing impedance matching, which is a main problem faced by the metal organic framework material derived wave-absorbing material. Therefore, prussian blue and the like have advantages as a metal organic framework material. In addition, because the ligand contains abundant metal ions, the metal content of the Prussian-like blue material is higher, so that the conductivity of the carbonized Prussian-like blue material is low, and the magnetic loss capacity is enhanced. This is also an important reason why the material is of interest to researchers. Therefore, the prussian-like blue is used as a precursor, and the metal alloy/carbon composite material with dielectric loss, magnetic loss and good impedance matching characteristics can be prepared by high-temperature carbonization.
Disclosure of Invention
The invention provides a magnetic/carbon composite material, a preparation method thereof and application thereof in electromagnetic wave absorption, and the prepared magnetic/carbon composite material not only has simple preparation method, high yield and low cost, but also has various metal alloy components and enhances the interface polarization loss and the magnetic loss of the material; meanwhile, the small particle shape promotes the diffraction and scattering of electromagnetic waves, so that the attenuation process is prolonged, and excellent electromagnetic wave absorption performance is obtained.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetic/carbon composite material is a nano porous network, wherein carbon in the material wraps a metal alloy (NiFe/CoFe), the particle size of the metal alloy is 10-100 nm, and the metal alloy catalyzes a carbon component to form a carbon nano tube; the interaction of the multi-metal alloy and the carbon components forms an interface, the polarization loss of the interface is enhanced, and the magnetic loss capability of the material is improved, so that the attenuation of electromagnetic waves is promoted, and the impedance matching characteristic is optimized.
A preparation method of a magnetic/carbon composite material comprises the following steps:
1) Adding CoCl 2 ·6H 2 O and NiCl 2 ·6H 2 Dissolving O in distilled water according to a certain proportion and adding a certain amount of trisodium citrate;
2) Dissolving a certain amount of potassium ferricyanide in distilled water;
3) Adding the solution in the step 2) into the solution in the step 1) at a certain speed in the stirring process, uniformly stirring, standing for a certain time, centrifugally cleaning, drying and collecting;
4) And (4) performing heat treatment on the precursor in the step 3) at 500-700 ℃ in a nitrogen atmosphere at a heating rate of 1-5 ℃/min for 2 h to obtain the magnetic/carbon composite material with multiple alloy components.
In the above steps, coCl is not less than 0 in the step 1) 2 ·6H 2 The amount of O is less than or equal to 2.4mmol, niCl is less than or equal to 0 2 ·6H 2 The amount of O is less than or equal to 1.8 mmol, and the mass range of trisodium citrate is 0.5 to 1.0 g;
the amount range of the potassium ferricyanide substance in the step 2) is 1.2 to 2.0 mmol; in the step 3), a separating funnel is used for controlling the dropping speed of the solution to be 5 to 20 mL/min;
the standing time in the step 3) is 12 to 48 hours;
mixing the magnetic/carbon composite material with multiple alloy components and paraffin, pressing into a ring with the inner-outer diameter ratio of 3.0/7.0, adjusting the filler ratio of the material to the paraffin to be 10-30 wt%, and testing and calculating the electromagnetic wave absorption performance.
Has the advantages that: the invention provides a magnetic/carbon composite material, a preparation method thereof and application thereof in electromagnetic wave absorption, wherein the magnetic/carbon composite material is directly prepared by coprecipitation and one-step heat treatment method, and the magnetic/carbon composite material is prepared by adjusting the concentrations of different introduced metal ions (Co) 2+ /Ni 2+ ) The influence of different alloy components on the electromagnetic performance of the material after heat treatment is researched, and the composite material with various alloy components is discoveredThe carbon-coated multi-metal alloy material has the advantages that more interfaces are introduced to enhance interface polarization loss of the material due to the fact that the carbon-coated multi-metal alloy material mainly has the advantages that the small carbon nano tubes can improve conductive loss of the material, can disperse alloy particles and improve magnetic loss of the material, in addition, multiple scattering and diffraction of electromagnetic waves are promoted due to the nano porous network structure formed by stacking the small particles, reaction paths are prolonged, attenuation of the electromagnetic waves in the material is further promoted, and new ideas and directions are provided for the fields of electromagnetic wave absorption and the like.
Drawings
FIG. 1 is a graph of the reflection loss at 18% loading for a magnetic/carbon composite prepared in example 1 of the present invention;
FIG. 2 is a TEM image of a magnetic/carbon composite prepared in example 2 of the present invention;
FIG. 3 is a graph of the reflection loss at 18% loading for the magnetic/carbon composite prepared in example 2 of the present invention;
FIG. 4 is an XRD pattern of a magnetic/carbon composite material prepared in example 3 of the present invention;
FIG. 5 is a graph of the reflection loss at 18% loading for the magnetic/carbon composite prepared in example 3 of the present invention;
fig. 6 is a graph of the reflection loss at a loading of 18% for the magnetic/carbon composite material prepared in example 4 of the present invention.
Detailed Description
The invention is further illustrated in the following description with reference to the figures and specific examples:
example 1
A preparation method of a magnetic/carbon composite material comprises the following steps:
2.4mmol of CoCl 2 ·6H 2 Dissolving O and 1.0 g of trisodium citrate in 80 mL of distilled water to form a transparent solution A; dissolving 2.0 mmol of potassium ferricyanide in 80 mL of distilled water to form a transparent solution B; dropwise adding the solution B into the solution A at the speed of 10mL/min by using a separating funnel during the continuous stirring process, stirring for 10 min, standing for 24 h, then centrifugally cleaning, drying and collecting; then the precursor is put under nitrogen atmosphere at 2 ℃/minCarrying out heat treatment at 600 ℃ for 2 h to obtain a magnetic/carbon composite material with alloy components; it was then mixed with paraffin wax at a 18% filler ratio and tested for electromagnetic parameters.
The reflection loss of the material under the filling amount of 18% is shown in a graph 1, and the reflection loss of the material at 3 mm can reach-29.69 dB, and meanwhile, the effective absorption bandwidth can also reach 6.44 GHz.
Example 2
A preparation method of a magnetic/carbon composite material comprises the following steps:
1.8 mmol of CoCl 2 ·6H 2 O、0.6 mmol NiCl 2 ·6H 2 Dissolving O and 1.0 g of trisodium citrate in 80 mL of distilled water to form a transparent solution A; dissolving 1.6 mmol of potassium ferricyanide in 80 mL of distilled water to form a transparent solution B; dropwise adding the solution B into the solution A at a speed of 20 mL/min by using a separating funnel during the continuous stirring process, stirring for 10 min, then standing for 24 h, centrifugally cleaning, drying and collecting; then, carrying out heat treatment on the precursor at 600 ℃ for 2 h at the speed of 2 ℃/min in a nitrogen atmosphere to obtain a magnetic/carbon composite material with multiple alloy components; it was then mixed with paraffin wax at a 18% filler ratio and tested for electromagnetic parameters.
From fig. 2, it can be seen that the magnetic/carbon composite material prepared in example 2 is a carbon-coated metal alloy, and the particle size of the metal alloy (NiFe/CoFe) is about 10 to 100 nm, and small carbon nanotubes exist. The reflection loss graph of the material under the condition that the filling amount is 18 percent is shown in 3, and the reflection loss can reach-43.60 dB and the effective absorption bandwidth can also reach 6.44 GHz when the material is 2.8 mm; it also has an ultra-wide effective absorption bandwidth of 6.84 GHz when the thickness is 2.7 mm.
Example 3
A preparation method of a magnetic/carbon composite material comprises the following steps:
1.2 mmol of CoCl 2 ·6H 2 O、1.2 mmol NiCl 2 ·6H 2 Dissolving O and 1.0 g of trisodium citrate in 80 mL of distilled water to form a transparent solution A; dissolving 1.6 mmol of potassium ferricyanide in 80 mL of distilled water to form a transparent solution B; under continuous stirringDropwise adding the solution B into the solution A at the speed of 10mL/min by using a separating funnel, stirring for 10 min, standing for 24 h, centrifuging, cleaning, drying and collecting; then, carrying out heat treatment on the precursor at 600 ℃ for 2 h at the speed of 2 ℃/min in a nitrogen atmosphere to obtain a magnetic/carbon composite material with multiple alloy components; it was then mixed with paraffin wax at a filler ratio of 18% and tested for electromagnetic parameters.
The magnetic/carbon composite material has a plurality of alloy components; FIG. 4 is an XRD pattern of the prepared magnetic/carbon composite material, and diffraction peaks of NiFe and CoFe alloy after calcination can be observed, which proves the existence of multi-alloy components. The reflection loss chart under the condition that the filling amount of the material is 18 percent is shown in a 5, the minimum reflection loss of the material at a position of 2.5 mm is-48.66 dB, and meanwhile, when the thickness is 2.7 mm, the ultra-wide effective absorption bandwidth is 7.16 GHz, and the specific frequency range is 10.44 to 17.6 GHz.
Example 4
A preparation method of a magnetic/carbon composite material comprises the following steps:
0.6 mmol of CoCl 2 ·6H 2 O、1.8 mmol NiCl 2 ·6H 2 Dissolving O and 0.5 g trisodium citrate in 80 mL of distilled water to form a transparent solution A; dissolving 2.0 mmol of potassium ferricyanide in 80 mL of distilled water to form a transparent solution B; dropwise adding the solution B into the solution A at the speed of 10mL/min by using a separating funnel during the continuous stirring process, stirring for 10 min, standing for 48 h, then centrifugally cleaning, drying and collecting; then, carrying out heat treatment on the precursor at 500 ℃ for 2 h at a speed of 2 ℃/min in a nitrogen atmosphere to obtain a magnetic/carbon composite material with multiple alloy components; it was then mixed with paraffin wax at a filler ratio of 18% and tested for electromagnetic parameters.
The reflection loss chart of the material under the filling amount of 18% is shown in 6, and it can be seen that when the material is 2.35 mm, the reflection loss can reach-42.54 dB, and the effective absorption bandwidth can reach 4.36 GHz; it also has a wide effective absorption bandwidth of 6.7 GHz when the thickness is 2.75 mm.
Example 5
A preparation method of a magnetic/carbon composite material comprises the following steps:
2.4mmol of NiCl 2 ·6H 2 Dissolving O and 1.0 g of trisodium citrate in 80 mL of distilled water to form a transparent solution A; dissolving 2.0 mmol of potassium ferricyanide in 80 mL of distilled water to form a transparent solution B; dropwise adding the solution B into the solution A at a speed of 5 mL/min by using a separating funnel during the continuous stirring process, stirring for 10 min, standing for 24 h, then centrifugally cleaning, drying and collecting; then, carrying out heat treatment on the precursor at 600 ℃ for 2 h at a speed of 5 ℃/min in a nitrogen atmosphere to obtain a magnetic/carbon composite material with multiple alloy components; it was then mixed with paraffin wax at a filler ratio of 18% and tested for electromagnetic parameters.
Example 6
A preparation method of a magnetic/carbon composite material comprises the following steps:
1.2 mmol of CoCl 2 ·6H 2 O、1.2 mmol NiCl 2 ·6H 2 Dissolving O and 0.8 g of trisodium citrate in 80 mL of distilled water to form a transparent solution A; dissolving 1.2 mmol of potassium ferricyanide in 80 mL of distilled water to form a transparent solution B; dropwise adding the solution B into the solution A at a speed of 20 mL/min by using a separating funnel during the continuous stirring process, stirring for 10 min, standing for 12 h, then centrifugally cleaning, drying and collecting; then, carrying out heat treatment on the precursor at 500 ℃ for 2 h at the speed of 5 ℃/min in a nitrogen atmosphere to obtain a magnetic/carbon composite material with multiple alloy components; it was then mixed with paraffin wax at a filler ratio of 18% and tested for electromagnetic parameters.
The embodiments described above are merely preferred embodiments of the present invention, which enables those skilled in the art to understand and implement the present invention. Those skilled in the art can make improvements and modifications to these embodiments and realize them in other embodiments without changing the technical principle of the present invention, and these improvements and modifications are also within the scope of the present invention. Any other form of substitution or modification of the invention according to the technical principle of the invention is within the scope of the invention.
Claims (9)
1. The magnetic/carbon composite material is characterized in that the material is a nano porous network, carbon in the material wraps a metal alloy, and the metal alloy catalyzes a carbon component to form a carbon nano tube; the multi-metallic alloy and the carbon component interact to form an interface.
2. The magnetic/carbon composite material as claimed in claim 1, wherein the metal alloy particle size is 10 to 100 nm.
3. The magnetic/carbon composite material according to claim 1 or 2, wherein the metal alloy is a NiFe alloy and a CoFe alloy.
4. The preparation method of the magnetic/carbon composite material is characterized by comprising the following steps:
1) Adding CoCl 2 ·6H 2 O and NiCl 2 ·6H 2 Dissolving O in distilled water according to a certain proportion and adding a certain amount of trisodium citrate;
2) Dissolving a certain amount of potassium ferricyanide in distilled water;
3) Adding the solution in the step 2) into the solution in the step 1) at a certain speed in the stirring process, uniformly stirring, standing for a certain time, centrifugally cleaning, drying and collecting;
4) And (3) carrying out heat treatment on the precursor in the step 3) at 500-700 ℃ in a nitrogen atmosphere, wherein the heating rate is 1-5 ℃/min, and the time is 2 h, so as to obtain the magnetic/carbon composite material with multiple alloy components.
5. The method for preparing a magnetic/carbon composite material according to claim 4, wherein 0 in step 1)<CoCl 2 ·6H 2 The amount of O substance is less than or equal to 2.4mmol<NiCl 2 ·6H 2 The amount of O is less than or equal to 1.8 mmol, and the mass range of trisodium citrate is 0.5 to 1.0 g.
6. The method for preparing a magnetic/carbon composite material according to claim 4, wherein the amount of the substance of potassium ferricyanide in step 2) is in the range of 1.2 to 2.0 mmol.
7. The preparation method of the magnetic/carbon composite material as claimed in claim 4, wherein the dropping speed of the solution in the step 3) is controlled to be 5 to 20 mL/min.
8. The method for preparing the magnetic/carbon composite material according to claim 4 or 7, wherein the standing time in the step 3) is 12 to 48 hours.
9. Use of the magnetic/carbon composite material according to any one of claims 1 to 3 for electromagnetic wave absorption.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045533A (en) * | 2007-03-12 | 2007-10-03 | 清华大学 | Carbon nano tube wave absorbtion mateirla of surface carried with magnetic alloy particle and preparation method thereof |
| CN114073919A (en) * | 2020-08-19 | 2022-02-22 | 中国科学院理化技术研究所 | Carbon-magnetic metal dispersion type hollow composite microsphere and preparation method and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045533A (en) * | 2007-03-12 | 2007-10-03 | 清华大学 | Carbon nano tube wave absorbtion mateirla of surface carried with magnetic alloy particle and preparation method thereof |
| CN114073919A (en) * | 2020-08-19 | 2022-02-22 | 中国科学院理化技术研究所 | Carbon-magnetic metal dispersion type hollow composite microsphere and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| HONGJIAO QU等: "MOF-derived multi-interface carbon-based composites with enhanced polarization loss and efficient microwave absorption", INTERNATIONAL JOURNAL OF SMART AND NANO MATERIALS, vol. 13, no. 3, 12 July 2022 (2022-07-12), pages 465 - 480 * |
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