CN113163698A - Honeycomb composite material and preparation method thereof - Google Patents
Honeycomb composite material and preparation method thereof Download PDFInfo
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- CN113163698A CN113163698A CN202110442634.2A CN202110442634A CN113163698A CN 113163698 A CN113163698 A CN 113163698A CN 202110442634 A CN202110442634 A CN 202110442634A CN 113163698 A CN113163698 A CN 113163698A
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- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/009—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive fibres, e.g. metal fibres, carbon fibres, metallised textile fibres, electro-conductive mesh, woven, non-woven mat, fleece, cross-linked
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- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
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- 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
- H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure
Abstract
The invention provides a honeycomb composite material and a preparation method thereof, belonging to the technical field of preparation of electromagnetic shielding materials. Honeycomb Ti of the invention3C2TxThe preparation method of the/Ag composite material coats Ti by using polymer microspheres as templates3C2TxMonolayer nanosheets of varying morphology to provide Ti3C2TxThe monolayer nanoplatelets become spherical and subsequently in Ti3C2TxThe ball is loaded with silver nano particles and is obtained after carbonization treatment, and Ti is reserved3C2TxThe material has high conductivity, silver nanoparticles are loaded on the surface of the material, the conductivity of the material is improved, and Ti is subjected to thermal cracking by the polymer microsphere template3C2TxThe single-layer nanosheet layer generates holes, so that the prepared material has a porous structure, the material density is lower, the multiple reflection loss of the material to electromagnetic waves is enhanced, and the electromagnetic wave absorption and shielding performance is better.
Description
Technical Field
The invention relates to the technical field of preparation of electromagnetic shielding materials, in particular to a honeycomb composite material and a preparation method thereof.
Background
Two-dimensional layered MXenes (Ti)3C2Tx) Is to use HF acid to react Ti3AlC2Extracting Al atomic layer to obtain novel two-dimensional layered structure, Ti3C2TxHas light weight and high specific surface area (2630 m)2(g) and high conductivity (the conductivity can reach 4665S/cm)-1) The novel structure is favorable for multiple reflection and scattering of electromagnetic waves between layers, and Ti is added3C2TxThe surface also has a large number of functional groups and intrinsic defects, which can increase dipole polarization, thereby enabling Ti3C2TxThe material becomes an excellent novel electromagnetic absorption material and receives wide attention. In 2016, Yuchang Qi et al found: ti with wave absorbing thickness of 1.4mm3C2TxThe effective wave-absorbing frequency band of the nano-sheet is 12.4-18GHz, and the minimum value of return loss is-11 dB (reference document [1 ]]:Qing Y,Zhou W,Luo F,et al.Titanium carbide(MXene)nanosheets as promising microwave absorbers[J]Ceramics International,2016,42(14):16412- & 16416.) the Ti3C2TxWhen the nano sheet is used as an electromagnetic shielding material, the requirement of commercial application is difficult to be well met, and the absorption and shielding performance of the nano sheet on electromagnetic waves is still to be improved.
Disclosure of Invention
The invention aims to provide a honeycomb composite material, a preparation method thereof and prepared honeycomb Ti3C2Txthe/Ag composite material has good electromagnetic wave absorption and shielding performance.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a honeycomb Ti3C2TxThe preparation method of the/Ag composite material comprises the following steps:
mixing the polymer microsphere suspension with Ti3C2TxMixing the single-layer nanosheet suspension to obtain a mixed suspension;
sequentially adding the mixed suspension and the silver nitrate solution into the sodium hydroxide solution, and then sequentially carrying out microwave treatment and carbonization treatment to obtain the honeycomb Ti3C2Txa/Ag composite material;
Ti3C2Txmiddle TxThe groups comprise F, Cl, Br, I, -OH, -CH3CHO, -CN, -NO.
Further, the polymer microspheres comprise polymethyl methacrylate microspheres; the particle size of the polymer microsphere is 1-5 mu m.
Further, the dispersion concentration of the polymer microspheres in the polymer microsphere suspension is 2.0-3.0 mg/mL; the Ti3C2TxTi in monolayer nanosheet suspension3C2TxThe dispersion concentration of the single-layer nanosheet is 1.0-2.0 mg/mL.
Further, the polymerizationMicrospheres and Ti3C2TxThe mass ratio of the single-layer nanosheets is 1: 1 to 5.
Further, the concentration of the silver nitrate solution is 0.5-2.0 mmol/L.
Further, the concentration of the sodium hydroxide solution is 0.05-0.15 mol/L.
Furthermore, the power of the microwave treatment is 200-400W, and the time of the microwave treatment is 1-2 min.
Further, the carbonization treatment is performed under an inert gas atmosphere.
Further, the temperature of the carbonization treatment is 400-500 ℃, and the time of the carbonization treatment is 1-2 h.
The invention provides a honeycomb Ti3C2Txa/Ag composite material.
The invention has the beneficial effects that:
the invention uses polymer microsphere as template, and coats Ti on the polymer microsphere3C2TxAfter monolayer nanosheet, coated Ti3C2TxThe ball is loaded with silver nano particles for carbonization treatment, the process is simple and stable, and not only can improve Ti3C2TxHigh conductivity of single-layer nanoplatelets, and Ti formation by carbonization3C2TxThe hollow sphere structure reduces the material density, and the polymer microspheres can also make two-dimensional Ti in the carbonization treatment process3C2TxThe single-layer nano-sheets form a honeycomb-shaped multi-spherical pore structure in three dimensions, so that the composite material has a porous structure, the density of the material is further reduced, and the porous structure can also enable Ti3C2TxThe composite material has certain flexibility and elasticity. In addition, the multi-layer reflection effect of the material on electromagnetic waves is increased due to the porous structure, and the electromagnetic waves are reflected and lost for multiple times in the porous hole walls after entering the material, so that the obtained material has better electromagnetic wave absorption and shielding performance.
Drawings
FIG. 1 is an SEM photograph of PMMA template pellets used in example 1 of the present invention;
FIG. 2 shows Ti produced in example 1 of the present invention3C2TxTi in monolayer nanosheet suspension3C2TxTEM images of single-layer nanoplates; wherein the diagram a is a single-layer Ti3C2TxTEM magnification picture of single-layer nanosheet, and picture b is for Ti3C2TxSelecting an image of an electronic diffraction pattern by using the single-layer nanosheets;
FIG. 3 is an SEM photograph of the dried solid obtained in step 4) of example 1 of the present invention;
FIG. 4 shows Ti obtained in example 1 of the present invention3C2TxSEM image of/Ag composite material;
FIG. 5 is an enlarged view of FIG. 4;
FIG. 6 shows Ti obtained in example 1 of the present invention3C2TxTEM image of/Ag composite; wherein the graphs a and b are Ti with different magnifications3C2TxAmplifying the picture of the Ag/Ag composite material by using a transmission electron microscope; FIG. c is the Ti of the outer shell3C2TxLocally amplifying a high-resolution lattice diagram at the joint of the single layer and the Ag interface; FIG. d is a pair of Ti3C2TxSelecting an electron diffraction pattern picture at the joint of the shell and the Ag interface;
FIG. 7 shows Ti obtained in step 2) of example 1 of the present invention3C2TxTi in monolayer nanosheet suspension3C2TxSingle-layer nano sheet and Ti obtained after carbonization treatment in step 4)3C2TxXRD pattern of/Ag composite material;
FIG. 8 shows a honeycomb Ti produced in example 1 of the present invention3C2TxAg/composite material and Ti of the same mass3C2TxSingle-layer nanosheet and Ti with hollow-pore-shaped structure under same mass3C2TxComparative plot of electromagnetic shielding performance of materials.
Detailed Description
The invention provides a honeycomb Ti3C2TxThe preparation method of the/Ag composite material comprises the following steps:
mixing the polymer microsphere suspension with Ti3C2TxMixing the single-layer nanosheet suspension to obtain a mixed suspension;
sequentially adding the mixed suspension and the silver nitrate solution into the sodium hydroxide solution, and then sequentially carrying out microwave treatment and carbonization treatment to obtain the honeycomb Ti3C2Txa/Ag composite material;
Ti3C2Txmiddle TxThe groups comprise F, Cl, Br, I, -OH, -CH3CHO, -CN, -NO.
In the present invention, the Ti is3C2TxMiddle TxThe group is preferably F, Cl or OH.
In the present invention, the polymer microspheres are preferably polymethyl methacrylate microspheres; the particle size of the polymer microsphere is 1-5 μm, preferably 2-3 μm.
In the invention, the dispersion concentration of the polymer microspheres in the polymer microsphere suspension is 2.0-3.0 mg/mL, preferably 2.2-2.8 mg/mL, and more preferably 2.5 mg/mL.
In the present invention, the Ti is3C2TxTi in monolayer nanosheet suspension3C2TxThe thickness of the single-layer nanosheet is 0.01-1.50 nm, preferably 0.50-1.0 nm, and more preferably 0.80 nm.
In the present invention, the Ti is3C2TxTi in monolayer nanosheet suspension3C2TxThe dispersion concentration of the single-layer nanosheet is 1.0-2.0 mg/mL, preferably 1.2-1.8 mg/mL, and more preferably 1.5 mg/mL.
In the present invention, the polymer microspheres and Ti3C2TxThe mass ratio of the single-layer nanosheets is 1: 1-5, preferably 1: 2-4, and more preferably 1: 3.
in the invention, the concentration of the silver nitrate solution is 0.5-2.0 mmol/L, preferably 1.0-1.5 mmol/L, and more preferably 1.2 mmol/L.
In the invention, the concentration of the sodium hydroxide solution is 0.05-0.15 mol/L, preferably 0.08-0.12 mol/L, and more preferably 0.10 mol/L.
In the invention, the power of the microwave treatment is 200-400W, preferably 300W; the microwave treatment time is 1-2 min, preferably 1.5 min.
In the invention, ultrasonic treatment is required before microwave treatment, and the ultrasonic treatment time is 5-15 min, preferably 10 min.
In the present invention, the carbonization treatment is performed in an inert gas atmosphere, preferably in an Ar atmosphere.
In the invention, the temperature of the carbonization treatment is 400-500 ℃, preferably 420-480 ℃, further preferably 450 ℃, and the time of the carbonization treatment is 1-2 h, preferably 1.5 h.
In the invention, centrifugal treatment is needed before carbonization treatment, and the lower-layer precipitate is collected; the rotation speed of the centrifugal treatment is 2500-3500 rpm, preferably 2600-3400 rpm, and more preferably 2800-3200 rpm; the time for the centrifugation treatment is 10 to 30min, preferably 15 to 25min, and more preferably 20 min.
The invention provides a honeycomb Ti3C2Txa/Ag composite material.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
1) Adding a PMMA pellet template with the average particle size of 1.8 mu m into 20mL of deionized water, and carrying out ultrasonic treatment for 10min to obtain a polymer microsphere suspension with the PMMA dispersion concentration of 2 mg/mL;
2) adding 1g of titanium aluminum carbide powder into a plastic bottle filled with 1.6g of lithium fluoride and 20mL of hydrochloric acid (the concentration is 9mol/L) for 5 times, stirring for 24 hours in an oil bath environment at 40 ℃, washing the obtained product with deionized water for multiple times until the pH value of washing water is 6, adding the washed solid into 40mL of water, and ultrasonically dispersing for 40min, whereinCentrifuging at 3500rpm for three times (6 min each time), collecting dark green upper suspension to obtain Ti3C2TxA single-layer nanosheet suspension; ti3C2TxTi in monolayer nanosheet suspension3C2TxThe dispersion concentration of the single-layer nanosheet is 2 mg/mL;
3) control of Ti3C2TxThe mass ratio of the Ti to the PMMA pellets is 1:2, and the Ti prepared in the step 2) is added3C2TxAdding the single-layer nanosheet suspension into the polymer microsphere suspension prepared in the step 1) to obtain a mixed solution, and stirring the mixed solution for 2 hours at a rotating speed of 400rpm under the protection of Ar atmosphere to obtain a mixed suspension;
4) and (3) dropwise adding the mixed suspension prepared in the step (3) into a 0.1mol/L sodium hydroxide solution, then dropwise adding a silver nitrate solution, carrying out ultrasonic treatment for 10min, and then placing the mixture into a microwave oven for microwave heating, wherein the microwave power is 200W. Then carrying out centrifugal treatment, and collecting the lower-layer precipitate; washing with deionized water once, centrifuging again, collecting the lower precipitate, and vacuum drying to obtain dried solid; the speed of the centrifugal treatment is 3000rpm, and the time of the centrifugal treatment is 20 min;
5) carbonizing the dried solid obtained in the step 4) at 400 ℃ for 1h by using a tubular furnace under the protection of Ar atmosphere to obtain the catalyst.
In step 1) of this example, the PMMA template pellet is used for SEM test, and the obtained SEM image is shown in fig. 1, from which it can be seen that the pellet diameter is 1.8 μm and all are relatively uniform spheres; for Ti obtained in step 2) of this example3C2TxTi in monolayer nanosheet suspension3C2TxThe single-layer nanosheet is subjected to TEM test, the obtained TEM image is shown in FIG. 2, and the Ti prepared can be known from FIG. 23C2TxThe form is a nano flake structure; SEM test of the dried solid obtained in step 4), the SEM image is shown in FIG. 3, and the Ti produced is shown in FIG. 33C2TxThe single-layer nano thin sheet is wrapped on the surface of a PMMA (polymethyl methacrylate) small ball serving as a template to form Ti3C2TxA single-layer nanosheet layer, wherein nano-silver particles are loaded on the surface of the single layer; ti obtained after the carbonization treatment in the step 5)3C2TxSEM test and TEM test are respectively carried out on the/Ag composite material, and SEM images and TEM images are respectively shown in figures 4, 5 and 6, and as can be seen from figure 4, Ti after carbonization treatment3C2TxThe structure similar to honeycomb is kept by/Ag, and as can be seen from FIG. 5, after carbonization treatment, the silver nanoparticles are loaded on the inner and outer sides of the pores. From the transmission electron scan of FIG. 6, it can be seen that the PMMA template inside has been removed, forming a spheroidal hollow shell structure, the Ti of the shell3C2TxThe thickness of the single-layer nano sheet is 1.0 nanometer, and the single-layer nano sheet is spherical Ti3C2TxThe surface is loaded with silver particles of 3.5 nanometers.
Separately for Ti obtained in step 2) of this example3C2TxTi in monolayer nanosheet suspension3C2TxSingle-layer nano sheet and Ti obtained after carbonization treatment in step 4)3C2TxXRD test is carried out on the/Ag composite material, the obtained XRD pattern is shown in figure 7, and the single-layer nanosheet material prepared is Ti as can be seen from figure 73C2TxTi after final heat treatment3C2Txthe/Ag material was not oxidized.
Example 2
1) Adding a PMMA (polymethyl methacrylate) small ball template with the average particle size of 5 mu m into deionized water for ultrasonic treatment for 10min to obtain a polymer microsphere suspension with the PMMA dispersion concentration of 2 mg/mL;
2) adding 1g of titanium aluminum carbide powder into a plastic bottle filled with 1.6g of lithium fluoride and 20mL of hydrochloric acid (the concentration is 9mol/L) for 5 times, stirring for 36h under the environment of oil bath at 40 ℃, washing the obtained product for multiple times by deionized water until the pH value of washing water is 5, adding the washed solid into 40mL of water, performing ultrasonic dispersion for 45min, repeatedly centrifuging at 4000rpm for 6min each time, and collecting dark green upper-layer suspension after centrifuging to obtain Ti3C2TxA single-layer nanosheet suspension; ti3C2TxTi in monolayer nanosheet suspension3C2TxThe dispersion concentration of the single-layer nanosheet is 2 mg/mL;
3) control of Ti3C2TxThe mass ratio of the Ti to the PMMA pellets is 1:5, and the Ti prepared in the step 2) is added3C2TxAdding the single-layer nanosheet suspension into the polymer microsphere suspension prepared in the step 1) to obtain a mixed solution, stirring the mixed solution for 2 hours at a rotating speed of 400rpm under the protection of Ar atmosphere to obtain a mixed suspension
4) And (3) dropwise adding the mixed suspension prepared in the step (3) into a 0.1mol/L sodium hydroxide solution, then dropwise adding a silver nitrate solution, carrying out ultrasonic treatment for 10min, and then placing the mixture into a microwave oven for microwave heating, wherein the microwave power is 200W. Then carrying out centrifugal treatment, and collecting the lower-layer precipitate; washing with deionized water once, centrifuging again, collecting the lower precipitate, and vacuum drying to obtain dried solid; the speed of the centrifugal treatment is 3000rpm, and the time of the centrifugal treatment is 20 min;
5) carbonizing the dried solid obtained in the step 4) at 400 ℃ for 1h by using a tubular furnace under the protection of Ar atmosphere to obtain the catalyst.
Ti obtained in example3C2Txthe/Ag composite material has basically similar structure and performance with the composite material obtained in the example 1.
Example 3
1) Adding a PMMA pellet template with the average particle size of 3.5 microns into deionized water, and carrying out ultrasonic treatment for 10min to obtain a polymer microsphere suspension with the PMMA dispersion concentration of 2 mg/mL;
2) adding 1g of titanium aluminum carbide powder into a plastic bottle filled with 1.6g of lithium fluoride and 20mL of hydrochloric acid (the concentration is 9mol/L) for 5 times, stirring for 36h under the environment of oil bath at 40 ℃, washing the obtained product for multiple times by deionized water until the pH value of washing water is 6, adding the washed solid into 40mL of water, ultrasonically dispersing for 35min, repeatedly centrifuging at 4000rpm for 6min each time, and collecting dark green upper-layer suspension after centrifuging to obtain Ti3C2TxA single-layer nanosheet suspension; ti3C2TxSingle layer nanoTi in flake suspension3C2TxThe dispersion concentration of the single-layer nanosheet is 2 mg/mL;
3) control of Ti3C2TxThe mass ratio of the Ti to the PMMA pellets is 1:3, and the Ti prepared in the step 2) is added3C2TxAdding the single-layer nanosheet suspension into the polymer microsphere suspension prepared in the step 1) to obtain a mixed solution, and stirring the mixed solution for 2 hours at a rotating speed of 400rpm under the protection of Ar atmosphere to obtain a mixed suspension;
4) and (3) dropwise adding the mixed suspension prepared in the step 3) into a 0.1mol/L sodium hydroxide solution, then dropwise adding a silver nitrate solution, carrying out ultrasonic treatment for 10min, and then placing the mixture into a microwave oven for microwave heating, wherein the microwave power is 250W. Then carrying out centrifugal treatment, and collecting the lower-layer precipitate; washing with deionized water once, centrifuging again, collecting the lower precipitate, and vacuum drying to obtain dried solid; the speed of the centrifugal treatment is 3000rpm, and the time of the centrifugal treatment is 20 min;
5) carbonizing the dried solid obtained in the step 4) at 400 ℃ for 1h by using a tubular furnace under the protection of Ar atmosphere to obtain the catalyst.
Ti obtained in example3C2Txthe/Ag composite material has basically similar structure and performance with the composite material obtained in the example 1.
Examples of the experiments
Ti obtained in comparative example 13C2TxAg/composite material and Ti of the same mass3C2TxSingle-layer nanosheet and Ti with hollow-pore-shaped structure under same mass3C2TxThe electromagnetic shielding performance of (1). Wherein, Ti3C2TxThe single-layer nano-sheet is Ti prepared according to the steps 1) to 2) of the example 13C2TxAnd (3) carrying out vacuum drying on the single-layer nanosheet suspension to obtain the nano-sheet suspension. Hollow-pore-structured Ti3C2TxIs obtained by drying the suspension obtained according to the step 3) of the example 1 in vacuum and then calcining the dried suspension at 450 ℃ under the protection of argon.
The testing method is implemented by mixing paraffinPorous Ti obtained in examples 1 and 23C2TxPressing into annular detection sample, wherein the total mass of paraffin and the material to be detected is 0.1g, and porous Ti3C2TxThe mass ratio of the material to the paraffin is 5:5 (the paraffin is a wave-transparent material and used as a binder, and the influence on the electromagnetic performance of the measured material can be ignored); and (3) putting the paraffin into a small crucible for heating and melting, then adding a sample to be measured, mixing, cooling, passing through a special mould, keeping for 30s without additionally applying pressure, and pressing into a cyclic paraffin sample with the thickness of 2.9 +/-0.05 mm, wherein the inner diameter is 3.04mm, and the outer diameter is 7.00 mm. For comparison, Ti of equal mass was mixed at the same mass ratio3C2TxSingle-layer nanosheet and hollow Ti3C2TxThe electromagnetic wave shielding performance of the ball is measured by pressing the ball into a ring shape. The Agilent N5244A type vector network analyzer is used for testing the electromagnetic wave band of 8-18GHz, the test result is shown in figure 8, and the honeycomb Ti prepared by the method is shown in figure 83C2Txthe/Ag material can improve the electromagnetic shielding performance of the material.
From the above examples, the present invention provides a honeycomb composite and a method for preparing the same. Ti of the invention3C2TxThe Ag/Ag composite material not only has high conductivity, but also has a hollow and porous spherical structure, and has lower material density and better electromagnetic wave absorption and shielding performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. Honeycomb Ti3C2TxThe preparation method of the/Ag composite material is characterized by comprising the following steps:
mixing the polymer microsphere suspension with Ti3C2TxMixing the single-layer nanosheet suspension to obtain a mixed suspension;
sequentially adding the mixed suspension and the silver nitrate solution into the sodium hydroxide solution, and then sequentially carrying out microwave treatment and carbonization treatment to obtain the honeycomb Ti3C2Txa/Ag composite material;
Ti3C2Txmiddle TxThe groups comprise F, Cl, Br, I, -OH, -CH3CHO, -CN, -NO.
2. The Ti of claim 13C2TxThe preparation method of the/Ag composite material is characterized in that the polymer microspheres comprise polymethyl methacrylate microspheres; the particle size of the polymer microsphere is 1-5 mu m.
3. The Ti of claim 23C2TxThe preparation method of the/Ag composite material is characterized in that the dispersion concentration of the polymer microspheres in the polymer microsphere suspension is 2.0-3.0 mg/mL; the Ti3C2TxTi in monolayer nanosheet suspension3C2TxThe dispersion concentration of the single-layer nanosheet is 1.0-2.0 mg/mL.
4. The Ti of claim 33C2TxThe preparation method of the/Ag composite material is characterized in that the polymer microspheres and Ti3C2TxThe mass ratio of the single-layer nanosheets is 1: 1 to 5.
5. The Ti of claim 43C2TxThe preparation method of the/Ag composite material is characterized in that the concentration of the silver nitrate solution is 0.5-2.0 mmol/L.
6. The Ti according to any one of claims 1 to 53C2TxThe preparation method of the/Ag composite material is characterized in that the concentration of the sodium hydroxide solution is 0.05-0.15 mol/L.
7. The Ti of claim 63C2TxThe preparation method of the/Ag composite material is characterized in that the power of microwave treatment is 200-400W, and the time of the microwave treatment is 1-2 min.
8. The Ti of claim 73C2TxThe preparation method of the/Ag composite material is characterized in that the carbonization treatment is carried out in an inert gas atmosphere.
9. The Ti of claim 83C2TxThe preparation method of the/Ag composite material is characterized in that the carbonization treatment temperature is 400-500 ℃, and the carbonization treatment time is 1-2 h.
10. Use of Ti as defined in any one of claims 1 to 93C2TxTi prepared by preparation method of/Ag composite material3C2Txa/Ag composite material.
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| CN116375491A (en) * | 2023-02-23 | 2023-07-04 | 之江实验室 | Honeycomb MXene material and preparation method and application thereof |
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| CN114655957A (en) * | 2022-04-28 | 2022-06-24 | 陕西科技大学 | Magnetic MXene wave-absorbing composite material with corallite structure and preparation method thereof |
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