WO2022242256A1 - Matériau de blindage électromagnétique à film mince composite à base de mxène poreuex léger et son procédé de préparation - Google Patents

Matériau de blindage électromagnétique à film mince composite à base de mxène poreuex léger et son procédé de préparation Download PDF

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WO2022242256A1
WO2022242256A1 PCT/CN2022/077223 CN2022077223W WO2022242256A1 WO 2022242256 A1 WO2022242256 A1 WO 2022242256A1 CN 2022077223 W CN2022077223 W CN 2022077223W WO 2022242256 A1 WO2022242256 A1 WO 2022242256A1
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mxene
preparation
dispersion
electromagnetic shielding
thin film
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PCT/CN2022/077223
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Chinese (zh)
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王子成
刘天西
唐新伟
曹国洋
李双双
张亚伟
胡志伟
鲁士杰
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江南大学
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation

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  • the invention relates to a lightweight porous MXene-based composite thin-film electromagnetic shielding material and a preparation method thereof, and belongs to the technical field of thin-film electromagnetic shielding materials and preparation thereof.
  • Electromagnetic shielding material as a functional protective material that effectively isolates incident electromagnetic waves by means of reflection loss outside the material and absorption loss inside the material, has been widely used in the field of electromagnetic protection.
  • the problems of electromagnetic leakage and interference in electrical equipment have become increasingly prominent. Therefore, people put forward higher performance requirements for electromagnetic shielding materials, requiring them to be thin, light, wide, and strong.
  • MXene is gradually becoming a class of electromagnetic shielding materials with very competitive advantages due to its ultra-high electrical conductivity, easy processing and low cost, and has attracted extensive attention.
  • the high density also results in less multiple scattering/reflection losses of electromagnetic waves inside the material, which is not conducive to the improvement of electromagnetic shielding effectiveness. Oxidation also leads to a decrease in its electrical conductivity, which reduces the electromagnetic shielding performance.
  • foaming agents to assist in the construction of the internal pore structure of MXene, the pore structure is often uneven due to problems such as dispersion, and it will also have a certain impact on the conductivity and stability of MXene.
  • the present invention provides a light porous MXene-based composite thin film electromagnetic shielding material and its preparation method, the purpose is to overcome the compactness inside the current MXene thin film, which is not conducive to multiple scattering/reflection of electromagnetic waves inside the thin film material, thus causing There are disadvantages such as poor absorption of electromagnetic waves inside the film.
  • high-temperature annealing treatment can effectively remove MXene surface groups, thereby achieving the purpose of improving the stability of MXene and increasing the durability of electromagnetic shielding materials.
  • the present invention firstly provides a kind of preparation method of lightweight porous MXene-based composite thin film electromagnetic shielding material, said method comprising:
  • MXene/GO dispersion Disperse MXene and GO (graphene oxide) in water to obtain a dispersion of MXene and GO, add a cationic surface modifier to the MXene dispersion and remove excess cationic surface by high-speed centrifugation After the modifier, the prepared positively charged MXene dispersion is prepared by mixing the positively charged MXene dispersion with the GO dispersion to obtain the MXene/GO dispersion;
  • step (2) Preparation of M/rGO thin film: the dispersion of MXene/GO obtained in step (1) was drop-coated on the polymer base sheet, dried at low temperature to remove moisture, and then the MXene/GO composite film was obtained from the sheet, and then The obtained MXene/GO composite film was annealed to obtain the M/rGO composite film.
  • the size of the precursor MAX used to prepare MXene is 200 to 400 meshes, and MXene is prepared by etching the MAX phase, and the etching solution is hydrochloric acid (HCl) and A mixture of lithium fluoride (LiF).
  • HCl hydrochloric acid
  • LiF lithium fluoride
  • step (1) after in-situ etching of MAX with HCl and LiF, single-layer or few-layer Mxene (Ti 3 C 2 T X ) is obtained by ultrasonic stripping, and the MXene The concentration of the dispersion is 2-10mg/mL.
  • step (1) the size of the original flake graphite used to prepare graphene oxide is 100-400 mesh, and the GO powder is prepared by the improved Hummers method, and the concentration of the GO dispersion is Control in 2 ⁇ 10mg/mL.
  • the GO accounts for 5-15% of the total mass of MXene and GO.
  • the positively charged MXene dispersion described in step (1) is specifically prepared by the following method: adding an excessive amount of cationic surface modifier in the MXene dispersion and passing through multiple high-speed Centrifugal washing removes excess cationic surface modifier, and then takes the sludge-like slurry at the bottom of centrifugation and adds water to disperse to obtain a positively charged MXene dispersion.
  • the cationic surface modifier described in step (1) is any one of polyethyleneimine, dopamine, 2,5-dimercapto-134-thiadiazole, etc. or several.
  • the speed of the high-speed centrifugation in step (1) is 8000-12000 r/min
  • the centrifugation time is 0.5-2 h
  • the centrifugation frequency is 2-5 times.
  • magnetic stirring is required when preparing the MXene/GO dispersion in step (1), the magnetic stirring time is 6-10 hours, and the magnetic stirring speed is 400-800r/min; The concentration of the MXene/GO dispersion is 2-10 mg/mL.
  • step (2) the low-temperature drying is carried out under vacuum, the temperature is 40-60°C, the drying time is 3-10h; the vacuum degree of the vacuum oven is -0.08-0.1MPa .
  • the polymer-based sheet is polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), Any one of polycarbonate (PC), etc., with a thickness of 0.1 to 1 mm.
  • the gas atmosphere used in the annealing treatment is hydrogen-argon mixed gas, wherein the hydrogen volume ratio is 5% to 20%, and the annealing temperature is 800°C to 1000°C, The time is 0.5-2 hours.
  • the second object of the present invention is to provide a lightweight porous MXene-based composite thin film electromagnetic shielding material prepared by the above preparation method.
  • the third object of the present invention is to provide aerospace devices, military equipment or precision electronic instruments comprising the above-mentioned lightweight porous MXene-based composite thin film electromagnetic shielding material.
  • the fourth object of the present invention is to provide the application of the above-mentioned lightweight porous MXene-based composite thin film electromagnetic shielding material in the field of electromagnetic protection.
  • the applications include applications in electromagnetic protection fields such as aerospace, military equipment, and precision electronic instruments.
  • the preparation method of the present invention is easy to operate and environmentally friendly.
  • the present invention realizes self-assembly by utilizing electrostatic interaction force to prepare MXene/GO dispersion liquid, and obtains MXene/GO nanocomposite film by vacuum drying in a vacuum oven.
  • High-temperature annealing treatment under argon mixed gas to obtain a porous MXene-based composite film with ultra-high specific efficiency.
  • GO is evenly dispersed in the interlayer of MXene.
  • CO 2 , CO and other gases will be generated during the high-temperature treatment of GO.
  • rGO reduced graphene oxide
  • the introduction of rGO with relatively low conductivity can cooperate with MXene heat treatment products to construct a gradient gradient structure of impedance, thereby improving the absorption capacity of the composite material for incident electromagnetic waves, providing an efficient preparation of lightweight porous ultra-high specific efficiency electromagnetic New approach to shielding composite films;
  • the present invention constructs a porous structure inside the composite film, so that the incident electromagnetic wave can be efficiently attenuated when it enters the material, and the shielding effect of the electromagnetic wave can cover the entire X-band.
  • the introduction of the porous structure makes the density of the composite material greatly reduced while maintaining the electromagnetic shielding performance.
  • the composite film material prepared by the present invention has excellent electromagnetic shielding performance and specific performance. When the thickness is only 15 ⁇ m, the porous MXene-based composite film obtained by adding 5wt% graphene oxide can maintain more than 49dB of electromagnetic shielding in the entire X-band.
  • Shielding efficiency, and the specific efficiency can reach 51551dB cm 2 g -1 on average.
  • the density is only 0.41g cm -3 under the condition that the electromagnetic shielding efficiency declines very little (>44dB).
  • the performance has reached 72316dB cm 2 g -1 , far exceeding similar materials.
  • the preparation process is simple and easy to operate, and is expected to be applied to fields requiring electromagnetic shielding, such as aerospace, military equipment, microelectronic equipment, and civilian electrical appliances.
  • the present invention uses a cationic surface modifier to modify the negatively charged MXene.
  • the modified MXene is positively charged and can be self-sustained with negatively charged GO nanosheets. assembly to achieve the purpose of uniform compounding.
  • the cationic surface modifier can be further decomposed into CO, CO 2 and other gases at high temperatures. While contributing to the generation of pore structures, the composite film after annealing is not Containing the cationic surface modifying agent can maintain the electrical conductivity of the composite film and contribute to the improvement of electromagnetic shielding performance.
  • the present invention is based on the principle that polar groups are unstable at high temperatures. Due to the existence of a large number of polar functional groups (-OH, -F, -O-, etc.) in MXene, it has good dispersibility and also To make the stability worse, the MXene/GO nanocomposite film is placed in a hydrogen-argon mixed gas environment for high-temperature heat treatment, and the polar groups in MXene are removed so that the heat-treated MXene/rGO nanocomposite film has better stability in the air. stability. At the same time, the presence of hydrogen can further reduce the oxidized part of MXene, so that the conductivity of MXene can be further recovered, which is helpful to improve the electromagnetic shielding performance.
  • polar functional groups -OH, -F, -O-, etc.
  • Figure 1 is a schematic diagram of the electromagnetic shielding mechanism of lightweight porous MXene-based composite films.
  • Figure 2(a) is a comparison of the conductivity of MXene and MXene (MX) after high temperature annealing and M-rG5 in air with time and the initial conductivity
  • Figure 2(b) is after 12 months in air Electromagnetic shielding performance comparison of M-rG5 before and after.
  • FIG. 3 are the scanning electron microscope images of the lightweight porous MXene-based composite film before and after high-temperature annealing, respectively.
  • Figure 4 shows the electrical conductivity diagrams of MX, M-rG0, M-rG5, M-rG10, M-rG15, and rGO after annealing at 800°C.
  • Figure 5 is the electromagnetic shielding effectiveness diagram of M-rG5 when the thickness is 15 ⁇ m.
  • Fig. 6 is an electromagnetic shielding effectiveness diagram of M-rG5, M-rG10, and M-rG15 when the thickness is 15 ⁇ m.
  • Figure 7 is the density and specific performance diagrams of M-rG5, M-rG10, and M-rG15 when the thickness is 15 ⁇ m.
  • Agilent E5063A vector network analyzer is used to measure the S parameters of the composite film by waveguide method in the frequency range of 8.2-12.4GHz.
  • MXene Dissolve 2g LiF in a hydrochloric acid solution prepared by 10mL water and 30mL concentrated hydrochloric acid by magnetic stirring in a polytetrafluoroethylene beaker, then add 2g 400 mesh aluminum carbon titanium oxide (Ti 3 AlC 2 ,MAX) powder, and The reactor was placed in a water bath at 35° C. and kept stirring for 24 hours, and then washed with absolute ethanol and ultrapure water by ultrasonication and centrifugation several times to remove residual impurities. The obtained MXene dispersion was freeze-dried for later use.
  • a hydrochloric acid solution prepared by 10mL water and 30mL concentrated hydrochloric acid by magnetic stirring in a polytetrafluoroethylene beaker
  • MXene/GO dispersion Dissolve 133mg of MXene in an appropriate amount of water, disperse MXene evenly after ultrasonic and magnetic stirring, then add 5mL of 50% polyethyleneimine aqueous solution, mix well after fully stirring, after 1.5h 11000r After high-speed centrifugation at /min, remove the sediment from the lower layer, and then continue to add an appropriate amount of ultrapure water to disperse evenly. Mix well under stirring, and name it as M-G5 dispersion.
  • Preparation of MXene/GO film Take 5mL of the MXene/GO dispersion obtained in step (1), drop-coat it on a polyethylene terephthalate (PET) sheet leveled by a leveler, and vacuum it in a vacuum oven. Drying at a vacuum degree of -0.08MPa and a temperature of 50°C. After drying for 10 hours, the film was peeled off from the PET sheet to obtain a MXene/GO composite film, which was named M-G5 film.
  • PET polyethylene terephthalate
  • porous MXene-based composite film The MXene/GO composite film obtained above was subjected to high-temperature annealing treatment in a hydrogen-argon mixed gas atmosphere, wherein the volume ratio of hydrogen gas was 10%, the high-temperature annealing treatment temperature was 800 ° C, and the time was 30 minutes to obtain porous MXene Based composite film, named M-rG5 film.
  • Dissolve 126mg of MXene in an appropriate amount of ultrapure water After ultrasonic and magnetic stirring, the MXene is uniformly dispersed. Then add 4.7mL of 50% polyethyleneimine aqueous solution. After fully stirring, it is dispersed evenly and placed in a high-speed centrifuge After 1.5h 11000r/min high-speed centrifugation, remove the lower layer of sediment, and then continue to add ultrapure water to disperse evenly. After repeating 4 times, add 25mL ultrapure water, and then add 2mL 7mg/mL graphene oxide that has been evenly dispersed by ultrasonic stirring The dispersion liquid was mixed evenly under magnetic stirring, and it was named M-G10 dispersion liquid.
  • Preparation of MXene/GO film Take 5mL of the MXene/GO dispersion obtained in step (1), drop-coat it on a polyethylene terephthalate (PET) sheet leveled by a leveler, and vacuum it in a vacuum oven. Drying at a vacuum of -0.08MPa and a temperature of 50°C. After drying for 10 hours, the film was peeled off from the PET sheet to obtain an MXene/GO composite film, which was named M-G10 film.
  • PET polyethylene terephthalate
  • MXene-based composite film The MXene/GO composite film obtained above was subjected to high-temperature annealing treatment in a hydrogen-argon mixed gas atmosphere, wherein the volume ratio of hydrogen gas was 10%, the high-temperature annealing treatment temperature was 800 ° C, and the time was 30 minutes to obtain porous MXene Based composite film, named M-rG10 film.
  • Dissolve 119mg of MXene in an appropriate amount of ultrapure water After ultrasonic and magnetic stirring, the MXene is dispersed evenly. Then add 4.5mL of 50% polyethyleneimine aqueous solution. After fully stirring, it is dispersed evenly and placed in a high-speed centrifuge After 1.5h 11000r/min high-speed centrifugation, remove the lower layer of sediment, and then continue to add ultrapure water to disperse evenly. After repeating 4 times, add 24mL ultrapure water, and then add 3mL 7mg/mL graphene oxide that has been evenly dispersed by ultrasonic stirring The dispersion liquid was mixed evenly under magnetic stirring, and it was named M-G15 dispersion liquid.
  • MXene/GO film Get 5ml of the MXene/GO dispersion obtained in step (1), drop-coat it on a polyethylene terephthalate (PET) sheet leveled by a leveler, and vacuum it in a vacuum oven. Drying, the vacuum degree is -0.08MPa, and the temperature is 50°C. After drying, the film is peeled off from the PET sheet to obtain an MXene/GO composite film, which is named M-G15 film.
  • PET polyethylene terephthalate
  • porous MXene-based composite film The MXene/GO composite film obtained above was subjected to high-temperature annealing treatment in a hydrogen-argon mixed gas atmosphere, wherein the volume ratio of hydrogen gas was 10%, the high-temperature annealing treatment temperature was 800 ° C, and the time was 30 minutes to obtain porous MXene Based composite film, named M-rG15 film.
  • FIG. 1 is a schematic diagram of the electromagnetic shielding of the lightweight porous MXene-based composite film in this example.
  • the present invention uses electrostatic interaction as the driving force to realize the self-assembly between MXene and GO nanosheets, and obtains porous film formation and annealing treatment by casting MXene-based composite film, with graphene as the skeleton, MXene is uniformly loaded on the graphene skeleton, through the formation of porous structure inside the material to achieve the purpose of reducing the material density and improving the multiple scattering/reflection loss of electromagnetic waves inside the material, thereby increasing the composite Material electromagnetic shielding specific effectiveness.
  • the introduction of reduced graphene oxide can also cooperate with highly conductive MXene cracking products to construct a gradient structure of impedance gradient, thereby increasing the introduction and attenuation of electromagnetic waves by the composite material.
  • Figure 2 is a comparison chart of the electrical conductivity of MXene and MXene (MX) after high temperature annealing and M-rG5 in the air with time and the initial electrical conductivity, and a comparison chart of the electromagnetic shielding performance before and after being placed in the air for 12 months.
  • MX MXene
  • M-rG5 MXene
  • the present invention can significantly improve the stability of the composite film and MXene through high-temperature annealing treatment. Even after being placed in the air for 12 months, the electromagnetic shielding performance is still well maintained, mainly because high-temperature annealing can The effective removal of MXene surface active groups enhances the stability of MXene and increases the oxidation resistance of electromagnetic shielding materials.
  • Fig. 3 is the scanning electron microscope picture of M-G5 and M-rG5 in the embodiment 1
  • Fig. 3 (a) and Fig. 3 (b) are the scanning electron microscope picture before and after annealing respectively, it can be seen that after 800 °C, 0.5h After high-temperature annealing, the internal porous structure of the film is obvious, and the small sheets of MXene are evenly loaded on the sheets of reduced graphene oxide, forming a uniform internal structure.
  • Fig. 4 is the variation diagram of the electrical conductivity that produces along with the graphene oxide addition difference in embodiment 1,2 and 3, because the electrical conductivity of reduced graphene oxide is lower than MXene, along with the increase of graphene oxide addition, The conductivity showed a gradually decreasing trend.
  • Fig. 5 is the electromagnetic shielding performance diagram of the MXene-based composite film (M-rG5) when the graphene oxide addition amount is 5wt% in embodiment 1, when the film thickness is 15 ⁇ m, the electromagnetic shielding performance is all above 49dB, covering the whole X band. At 8.263GHz, the electromagnetic shielding effectiveness reaches a maximum value of 58.361dB.
  • Figure 6 is a comparison chart of the electromagnetic shielding effectiveness of M-rG5, M-rG10 and M-rG15 when the sample thickness is the same (15 ⁇ m) in Examples 1, 2 and 3. It can be seen that M-rG5 has the highest electromagnetic shielding effectiveness value.
  • the inside of the film becomes more fluffy, and the density decreases; also because the electromagnetic shielding efficiency gradually decreases with the increase of the graphene oxide content, but the final specific performance shows a completely opposite result, which is mainly attributed to the composite material with the The rate at which the density of the material decreases with increasing GO content is much higher than the rate at which the electromagnetic shielding effectiveness decreases.
  • Preparation of MXene/GO film Take 5mL of the MXene/GO dispersion obtained in step (1), drop-coat it on a polyethylene terephthalate (PET) sheet leveled by a leveler, and vacuum it in a vacuum oven. Drying, the vacuum degree is -0.08MPa, and the temperature is 50°C. After drying for 10 hours, the film is peeled off from the PET sheet to obtain the MXene/GO composite film.
  • PET polyethylene terephthalate
  • porous MXene-based composite film The MXene/GO composite film obtained above was subjected to high-temperature annealing treatment in a hydrogen-argon mixed gas atmosphere, wherein the hydrogen volume ratio was 20%, the high-temperature annealing treatment temperature was 900 ° C, and the time was 30 minutes to obtain porous MXene base composite film.
  • the electromagnetic shielding effect of the porous MXene-based composite film prepared in this example can cover the entire X-band, and the density of the composite material is greatly reduced while maintaining the electromagnetic shielding performance.
  • the composite film material prepared in this example has excellent Electromagnetic shielding effectiveness and specific effectiveness.
  • Preparation of MXene/GO film Take 5mL of the MXene/GO dispersion obtained in step (1), drop-coat it on a polystyrene (PS) sheet leveled by a leveler, and vacuum-dry it in a vacuum oven with a vacuum degree of - 0.08MPa, the temperature is 50°C, after drying for 10h, the film is peeled off from the PS sheet to obtain the MXene/GO composite film.
  • PS polystyrene
  • porous MXene-based composite film The MXene/GO composite film obtained above was subjected to high-temperature annealing treatment in a hydrogen-argon mixed gas atmosphere, wherein the volume ratio of hydrogen gas was 5%, the high-temperature annealing treatment temperature was 800 ° C, and the time was 60 minutes to obtain porous MXene base composite film.
  • the electromagnetic shielding performance of the porous MXene-based composite film prepared in this example is above 47.5 dB in the entire X-band.
  • the density (0.4g/cm 3 ) of the composite material is greatly reduced while maintaining the electromagnetic shielding performance.
  • the composite thin film material prepared in this embodiment has excellent electromagnetic shielding performance and specific performance.
  • Preparation of MXene/rGO composite film take the M-G5 film obtained in Example 1 and carry out high-temperature treatment under a hydrogen-argon mixed gas atmosphere, wherein the hydrogen volume ratio is 10%, the high-temperature annealing treatment temperature is 1000 ° C, and the time is 0.5h. After treatment, the brittleness of the composite film increases, but the electromagnetic shielding effect can still cover the entire X-band, and the electromagnetic shielding performance in the entire X-band is above 35dB.
  • the film was peeled off from the PET sheet to obtain MXene/GO
  • the composite film is subjected to high temperature treatment in a hydrogen-argon mixed gas atmosphere, wherein the hydrogen volume ratio is 10%, the high temperature annealing treatment temperature is 800°C, and the time is 0.5h. Due to the high concentration of the dispersion liquid, the viscosity is relatively high. The resulting film is thicker and has poor thickness uniformity.
  • the film was removed from the PET sheet to obtain the MXene/GO composite film, which was subjected to high-temperature treatment in a hydrogen-argon mixed gas atmosphere, wherein the hydrogen volume ratio was 10%, and the high-temperature annealing treatment temperature was 800 °C, and the time For 0.5h, due to the low concentration of dispersion liquid and low solid content, the obtained film is thinner (10 ⁇ m) and more brittle, and its electromagnetic shielding performance in the entire X-band is above 42dB
  • the M-G5 film was treated under hydrogen-argon mixed gas, in which the volume ratio of hydrogen gas was 10%, the high-temperature annealing treatment temperature was 800°C, and the time was 10min, 30min, and 60min respectively.
  • the electromagnetic shielding performance test was carried out on the M-rG5 composite film treated with different annealing times.
  • the M-rG5 composite film with an annealing time of 10 minutes has excellent electromagnetic shielding performance in the entire X-band, with an average of 52dB and a density of 0.97g/cm 3 ;
  • the M-rG5 composite film with an annealing time of 30min has excellent electromagnetic shielding performance in the entire X-band, with an average of 52dB and a density of 0.67g/cm 3 ;
  • the M-rG5 composite film with an annealing time of 60min has excellent electromagnetic shielding performance in the entire X-band It has excellent electromagnetic shielding performance, the average can reach 49dB, and the density is 0.4g/cm 3 .

Abstract

La présente invention concerne le domaine technique des matériaux de blindage électromagnétique à film mince et sa préparation. Sont divulgués un matériau de blindage électromagnétique à film mince composite à base de MXène poreux léger et son procédé de préparation. Au moyen de la présente invention, une force d'interaction électrostatique en tant que force d'entraînement est appliquée à MXène modifié au moyen d'un modificateur de surface cationique, et de l'oxyde de graphène, de manière à réaliser un auto-assemblage du MXène et de l'oxyde de graphène, et un matériau de blindage électromagnétique composite à base de MXène poreux léger ayant une efficacité spécifique ultra-élevée est ensuite obtenu par coulée dans un film et recuit à haute température. Lorsque l'épaisseur du matériau de film mince composite de la présente invention est seulement de 15 µm, le film mince composite à base de MXène poreux peut maintenir une efficacité de blindage électromagnétique de 49 dB ou plus sur toute la bande X, et après 12 mois, l'efficacité de blindage électromagnétique est maintenue dans une large mesure et est maintenue à 47 dB ou plus sur toute la bande X. Le procédé de préparation est simple et facile à utiliser, et est prévu pour être appliqué aux domaines de l'aérospatiale, des dispositifs militaires, des dispositifs électroniques miniatures, des appareils électriques civils, etc.
PCT/CN2022/077223 2021-05-17 2022-02-22 Matériau de blindage électromagnétique à film mince composite à base de mxène poreuex léger et son procédé de préparation WO2022242256A1 (fr)

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CN117641872A (zh) * 2023-11-27 2024-03-01 山东省地质科学研究院 中空二氧化锰纳米管负载MXene材料及制备方法

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CN113998693A (zh) * 2021-10-22 2022-02-01 北京石墨烯技术研究院有限公司 石墨烯纳米卷的制备方法
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CN115521553B (zh) * 2022-10-11 2023-03-14 昆明理工大学 一种石墨烯/MXene/聚苯乙烯复合材料的制备方法及应用
CN115850968A (zh) * 2022-10-18 2023-03-28 中科院广州化学有限公司 一种MXene基高导热防火复合薄膜及其制备方法与应用

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