RLmin Value Research Articles

CoSe2@polythiophene core-shell composites with enhanced interfacial polarization for high-performance broadband electromagnetic absorption

Rational design the composition and structure is an effectual measure to develop the high-performance electromagnetic (EM) wave absorbing materials. In this work, core-shell structured CoSe2@polythiophene (CoSe2@PTh) composites are synthesized via a simple hydrothermal followed by in-situ polymerization process. Benefiting from the conductive network increased by conductive polymer incorporation, interfacial effects caused by core-shell structure and multi-component optimizing the impedance matching, the EM absorption performance of samples is significantly improved. The minimum reflection loss (RLmin) value of −49.60 dB and the effective absorption bandwidth (EAB) of 4.20 GHz are obtained for CoSe2. After cladding, the CoSe2@PTh possesses RLmin of −55.40 dB and broadened EAB of 5.8 GHz at 10 wt% filling amount. This work broadens the application of transition metal selenide in EM absorption, such as MnSe2 and NiSe2, and provides an eco-friendly and convenient way to construct core-shell structure and multi-component for lightweight broadband EM absorbing materials.

Natural green raw-based Biochar@Co/C composites: Simple water bath synthesis and excellent electromagnetic wave absorption properties

Over the last few years, wave absorbing materials synthesized based on green and eco-friendly natural materials were less studied. Carbon materials derived from natural materials, for example, have a limited absorption performance due to impedance mismatch in electromagnetic wave absorption applications. In this work, composites of MOF derivatives and biochar with strong wave absorbing capability were prepared by biochar and MOF. Biochar was green raw material originated from kapok trees in the school. Then it was compounded with MOF derivatives by pretreatment and water bath to form Biochar@Co/C composites. The effect of annealing temperature on the absorption properties was investigated by varying the annealing temperature. According to the results of the transmission line theory analysis, Biochar@Co/C-700 have RLmin value of −55.22 dB at 5.43 GHz and 3.69 mm. Also, the effective absorption bandwidth EAB can reach 6.37 GHz at 1.94 mm. And the above absorption properties were measured when the filling ratio was only 15 %. Electromagnetic parameter analyses showed that the combination between biochar and MOF derivatives greatly improves the impedance matching of the carbon-based materials, which is a vital factor that enables Biochar@Co/C-700 to have excellent wave-absorbing properties. In addition, the loss mechanism of the complexes to electromagnetic waves was also analyzed and summarized. These results provide a reference path for the preparation of high-performance electromagnetic wave absorption composites from green materials.

Preparation of fluorinated carbon nanotube with heterogenous fluorine pattern and the electromagnetic response

The heterogeneous interface structures are widely recognized for the favorable impact on optimizing microwave absorption (MA) properties of microwave absorbers. However, the facile construction of heterogeneous interface and deep exploration of the electromagnetic response is challenging. Herein, we presented an approach of direct fluorination utilizing F2/N2 to construct heterogenous interface on single walled carbon nanotubes (SWCNTs), and the electromagnetic effect was disclosed. By molecular fluorination, fluorinated SWCNTs with heterogeneously aggregated fluorine pattern (M-CNTs-F) were fabricated. The aggregated fluorine pattern on M-CNTs-F lead to stronger polarization loss strength compared to pristine SWCNTs and the discrete-fluorine pattered sample, as well as gradual prolongation of relaxation time (τ) with increase of fluorine content. Consequently, M-CNTs-F demonstrates superior MA property with minimal reflection loss (RLmin) and effective absorption band (EAB) value of −49 dB and 5.6 GHz at 1.76 mm with filler content only 2 wt%. Surprisingly, M-CNTs-F also exhibit preferable low frequency MA performance. Based on aforementioned foundations, M-CNTs-F were furtherly architected to construct CNT-contained composite foam, achieving RLmin and EAB value of −66 dB and 10.36 GHz, respectively. Our study highlights the superiority of direct fluorination in constructing heterogeneous interface, and emphasizes the critical role of heterojunction pattern in MA modification.

FeNi/C/TiO2 composites derived from [Fe(pz)Ni(CN)4] Hofmann framework and MXene for efficient electromagnetic absorption

Chemical composition and morphological optimization are both effective strategies for constructing excellent electromagnetic wave absorption (EMWA) materials. While efficient EMWA materials derived from both metal-organic frameworks (MOFs) and MXenes have been extensively studied, composites derived from the Hofmann framework with MXene have not been reported. In this study, we employed a Hofmann framework ([Fe(pz)Ni(CN)4], pz = pyrazine) and MXene (Ti3C2Tx) to create new MXene@Hofmann (MH1 and MH2) composites, using a simple co-precipitation method with two different contents of [Fe(pz)Ni(CN)4]. The FeNi/C/TiO2 composites with a multi-layered structure inherited from MXene were prepared by annealing the MXene@Hofmann composites at 500, 600, and 700 °C, resulting in the formation of MH1-500/600/700 and MH2-500/600/700 composites. Their compositions, morphologies, electromagnetic parameters, and EMWA performances were characterized. For the composites with a high [Fe(pz)Ni(CN)4] content, MH2-600 has a minimum reflection loss (RLmin) value of −30.63 dB at a thickness of only 1.8 mm and the broadest effective absorption bandwidth (EAB) of 3.90 GHz at 2.0 mm, while MH2-700 exhibits superior EMWA performance with an RLmin value of −34.34 dB at 1.9 mm and an EAB value of 4.96 GHz at 2.1 mm. Their impressive EMWA performance might be attributed to the synergistic dielectric loss and magnetic loss and also the impedance matching from the reasonable ratio of the magnetic and dielectric components. This work demonstrates an effective strategy for constructing EMWA materials from the Hofmann framework and MXene.

Controllable synthesis and enhanced microwave absorption properties of hexagonal boron nitride@polyaniline composite

Nowadays, electromagnetic pollution caused by electronic devices is gradually becoming a concern. Moreover, as the frequency of electromagnetic pollution from electronic devices is mainly in the range of 2–10 GHz, the design of microwave-absorbing materials for this frequency range has become a hot issue. To tackle the issue, core-shell structured hexagonal boron nitride (h-BN) @polyaniline (PAn) composites have been proposed to construct heterogeneous microwave-absorbing materials. Firstly, the h-BN is exfoliated, and hydroxyl functionalized to produce hydroxy boron nitride (OH-BN), which enhances its polarization ability by structuring defects and adding functional groups to improve its microwave absorption efficiency. Afterward, PAn was grafted on the OH-BN surface by in situ polymerization. The microwave absorption properties of OH-BN@PAn composites can be tuned by modulating the doping of PAn. As expected, the OH-BN@PAn composite exhibits superior microwave absorption properties with the minimum reflection loss (RLmin) value of −38.60 dB at 3.5 mm and an effective absorption bandwidth (EAB) of 3.4 GHz (6.24–8.64 GHz) at pH = 2. Also, the composite achieves effective microwave absorption at 3.76–18 GHz by adjusting the matching thickness. Notably, the RLmin value of OH-BN@PAn was successfully tuned from the high-frequency region (12.4 GHz, pH = 0) to the low-frequency region (7.28 GHz, pH = 2) by adjusting the doping degree. In addition, the RL value and EAB width have been increased due to the increased impedance matching and polarization capability. This work can provide a reference for constructing composite microwave-absorbing materials and regulating microwave absorption performance.

Heterogeneous burr-like CoNiO2/Ti3C2Tx MXene nanospheres for ultralow microwave absorption and satellite skin application

Nowadays, it is still a challenging task to exploit electromagnetic wave absorption (EMA) materials with superior EMA performance under an ultrasmall thickness (approximately 1 mm). In this study, heterogeneous CoNiO2/Ti3C2Tx MXene hybrid absorbers were successfully synthesized by using a simple and convenient self-assembly process. Benefiting from the increased porosity, heterogeneous interfaces, and multiple polarization processes, the unique burr-like CoNiO2/Ti3C2Tx MXene nanospheres (CNO/MXene-S) exhibited a remarkable EMA capacity with a minimum reflection loss (RLmin) value of −60.61 dB at an ultrasmall thickness of 1.069 mm and −66.79 dB at a matching thickness of 2.565 mm, respectively. The density functional theory (DFT) calculations were utilized to analyze the EMA mechanisms. Furthermore, the satellite radar cross-section (RCS) simulations demonstrated that compared with a non-stealth satellite, a stealth satellite with the CNO/MXene-S absorber exhibited decreased surface reflection of radar waves and a shortened radar detection distance. Therefore, the as-prepared CNO/MXene-S absorber with an ultrasmall matching thickness can be highly promising for the electromagnetic protection of spacecraft and electromagnetic communication devices.

Thin La doped CaMnO3 ceramics for attenuation−impedance balance to facilitate excellent microwave absorption

The perovskite structure oxide, CaMnO3, has been extensively investigated and applied as a potential microwave absorption material due to its versatile dielectric and spontaneous polarization. However, the low conductivity of pure CaMnO3 material limits its further application. Herein, to increase dielectric loss and achieve better microwave absorption properties, lanthanum (La)-doped CaMnO3 (Ca1-xLaxMnO3) ceramics were fabricated by a high temperature solid state reaction. The results of XRD and XPS show that the La atom was efficiently doped at the Ca site in CaMnO3, which carries excess positive charges and affects the valence state of Mn ions and the concentration of oxygen vacancies. Therefore, the conductivity and imaginary permittivity of Ca1-xLaxMnO3 ceramics increased dramatically with La-doped content. Benefiting from the tunable dielectric and impedance properties, Ca1-xLaxMnO3 ceramics can be utilized in a highly efficient way to absorb microwave radiation with a thin thickness. The sample with x = 0.04 shows the best microwave absorption property, with an RLmin value of -52.63 dB (d = 1.41 mm) and effective absorption bandwidth coves full X band in the thickness range from 1.315 mm to 1.395 mm.

A control strategy for microwave absorption performance on a two-dimensional scale

Two-dimensional (2D) zeolitic imidazolate frameworks (ZIFs) are promising materials for microwave absorption for their desirable features. However, there has been a lack of a corresponding relationship between the growth pattern of 2D ZIF materials at the micro-scale and the macroscopic microwave absorption performance. This work synthesized 2D ZIF-L and its derivatives via a precise structural regulation strategy. By changing the axial orientation of crystal growth, the synthesis of two-dimensional bladed and rod-shaped precursors with controllable thickness and varying shapes at the macro scale was controlled. The leaf-like structure of ZIF-L derivates with large surface area is beneficial for the exposure of reactive oxygen vacancies, increasing the relaxation loss. While the ultra-thin rod-shaped structure which can shorten the electron migration and jump paths to reduce the energy barrier is advantageous to conductive loss. As a result, the prepared L-7 exhibits superior electromagnetic wave absorption ability with the widest effective absorption bandwidth (EAB) of 5.53 GHz at a thickness of 1.80 mm. When the total thickness is 1.90 mm, R-7 can exhibit the minimum reflection loss (RLmin) value of about −60.40 dB. This study emphasizes the 2D scale regulation for obtaining new generation and environmentally friendly microwave absorbers. Metal-based materials derived from ZIF-L with extremely thin thicknesses and a large surface area have shown great potential in microwave absorbers.

Synergistic impacts of Fe/Fe3C and Fe-Nx on high-efficiency microwave-absorbing properties of Fe/Fe3C@NC composites

The construction of multi-component composites has become an attractive strategy for high-performance microwave absorption through balancing the magnetic and dielectric loss. However, the influences of different components on absorption performance are ambiguous, which has inevitably hampered the widespread applications of microwave absorbents. Herein, we rationally designed the multi-component absorbers of N-doped carbon composited with Fe/Fe3C nanoparticles, and systematically investigated the impacts of Fe/Fe3C nanoparticles and Fe-Nx moieties on the microwave-absorbing capacities. It is found that the coexisitence of Fe/Fe3C and Fe-Nx is indispensable to realize the strong microwave absorption ability by simultaneously enhancing the dielectric and magnetic loss in the frequency range of 2–18 GHz. As expected, our optimal absorber dispersed in paraffin with a filler loading of 15 wt% exhibits the minimum reflection loss (RLmin) value of −49 dB and the maximum effective absorption bandwidth (BWeff) value of 4.2 GHz at a low thickness. Our work specifies the importance and influence of the coexistence between the Fe-Nx configurations and Fe/Fe3C nanoparticles in the carbon-based composites for the superior microwave absorption and inspires the future fabrication of extraordinary materials in the electromagnetic field.

Wheat-like Ni-coated core–shell silver nanowires for effective electromagnetic wave absorption

Nowadays, developing high-performance electromagnetic functional materials to eliminate the ever-increasing electromagnetic pollution problem is necessary for the complex electromagnetic environment. However, the materials with high electrical conductivity are prone to secondary electromagnetic pollution due to interface impedance mismatching. Herein, the wheat-like electrically conductive and magnetic silver nanowire@nickle (AgNW@Ni) composites were fabricated via a one-pot in-situ growth method. The electromagnetic properties of the composites could be regulated by adjusting different ratios of precursors, resulting in various morphological features of the nanowire as the core with different Ni shell thicknesses. When the Ag and Ni molar ratio was 1:1.1, the AgNW@Ni composite exhibited the optimal minimum reflection loss (RLmin) of −61.1 dB with an adequate effective absorption bandwidth (EAB) of 4.06 GHz owing to good impedance matching, abundant heterostructures, and synergistic electrical and magnetic losses. Even after three months, it still maintained an acceptable RLmin value of −39.7 dB and similar EAB, demonstrating its long-term operational stability. This unique composite is expected to be applied in more actual electromagnetic protection occasions.

Achieving wideband electromagnetic wave absorbing performance for PMMA-based composites foam by designing the alternating directional (AD) microporous structure

Good impedance matching and attenuation ability of electromagnetic wave absorbing (EMA) materials are required to broaden the effective absorbing bandwidth (EAB) and reduce minimum reflection loss (RLmin), achieving high EMA performance. Here we report a polymethylmethacrylate (PMMA)-based composites foam with alternating and directional (AD) microporous structure that possessing broadened EAB value of 3.53 GHz (8.49–12.02 GHz) and lowered RLmin value of −19.35 dB, was manufactured via the one-step physical constraint foaming technology. Structural studies reveal that the AD microporous structure can induce the carbon nanotubes (CNTs) oriented distribution to improve effective concentration of CNTs, achieving excellent impedance matching. Meanwhile, a large number of parallel-plate capacitors at the multilayer layer interfaces were generated to promote interfacial polarization, including enhancement of multiple reflection and scattering of electromagnetic wave at the layer interfaces. Thereby, the composites foams exhibited high attenuation ability. This study lays the foundation for rational design and synthesis of EMA materials for wideband EMA performance.

Recycling Polyethylene into High‐Value Porous Carbon Composites for Microwave Absorption

The recycling of solid plastic waste has been a major challenge to the sustainable development of today's society. Herein, one of the commonly wasted plastic raw materials, linear low‐density polyethylene (LLDPE), is used as the carbon source to explore high‐value porous carbon composites for microwave absorption applications. The carbon composites are simply obtained through the delicate carbonization of LLDPE, followed by in situ introducing Ni nanoparticles (NPs) into the carbon monolith. The porous carbon composites show a minimum reflection loss (RLmin) value of −52.2 dB at 1.65 mm, which demonstrates excellent microwave absorption properties of the wasted plastic‐derived carbon materials. In addition, the anticorrosion performance of the carbon composites is evaluated by electrochemical technique. Above all, the current study provides a new idea and simple strategy for processing wasted plastics to high‐value porous carbon materials.

Electrostatic self-assembly sandwich-like 2D/2D NiFe-LDH/MXene heterostructure for strong microwave absorption

MXene has great application potential in electromagnetic (EM) wave absorbers because of its high attenuation ability; however, self-stacking and excessively high conductivity are major obstacles to its widespread use. To address these issues, a NiFe layered double hydroxide (LDH)/ MXene composite with two-dimensional (2D)/2D sandwich-like heterostructure was constructed through electrostatic self-assembly. The NiFe-LDH not only acts as an intercalator to prevent self-stacking of the MXene nanosheets, but also serves as a low-dielectric choke valve to optimize impedance matching. At a thickness of 2 mm and filler loading of 20 wt%, the minimum reflection loss (RLmin) value could reach −58.2 dB, and the absorption mechanism was analyzed based on multiple reflection, dipole/interfacial polarization, impedance matching, and synergy between dielectric and magnetic losses. Furthermore, the simulation of the radar cross section (RCS) further confirmed the efficient absorption properties and application prospects of the present material. Our work demonstrates that designing sandwich structures based on 2D MXene is an effective way to improve the performance of EM wave absorbers.

Ordered mesoporous carbon with hierarchical pore structure for high-efficiency electromagnetic wave absorber under thin matching thickness

An enormous challenge exists in the development of low-density and efficient microwave absorbers with thin matching thickness. Carbon materials with hierarchical porosity are regarded as potential candidates for practical applications of microwave absorption (MA) materials on account of their rich pore structure which facilitates the entry and attenuation of electromagnetic waves. Herein, ordered mesoporous carbon with hierarchical interconnected network structure (NOMC) was prepared through a self-assembly method and calcination treatment. It was found that by adjusting the annealing temperature, the hierarchical porous structure, the carbon defect, the dielectric loss property and the MA property could be tuned. Thanks to the balance between sufficient hierarchical porous structure, outstanding impedance matching condition and multiple loss modes, NOMC displays outstanding ability to dissipate electromagnetic waves at a very thin absorbing coating thickness. Notably, as-prepared NOMC-700 displays an outstanding MA property, whose minimum reflection loss (RLmin) value reaches −27.5 dB at 16.72 GHz and the effective absorption bandwidth (EAB) achieves 3.2 GHz (14.8–18 GHz) under 1.5 mm absorbing coatings. Hence, the satisfying design in porous microstructure can pave the way for efficient MA materials with thin matching thickness.

Epoxy resin/2-imidazole coated carbonyl iron powder: Synthesis, structure and corrosion performance

Magnetic metal absorbers are susceptible to strong corrosion in acid, alkali and salt fog environments, resulting in strong limitations of their applications. Therefore, it is urgent to develop magnetic absorber with enhanced anti-corrosion and microwave absorption. In this paper, carbonyl iron powder (CIP) coated with 2-methylimidazole/epoxy (2-MI/EP) composites were prepared by in-situ polymerization. The CIP@2-MI/EP composites showed better microwave absorption performance with a minimum reflection loss (RLmin) value of −54.11 dB at 9.69 GHz with 2 mm thickness. The electrochemical test results show that the corrosion current density of the composites decreases by two orders of magnitude and the corrosion potential is positively shifted to −0.1. In addition, the presence of 2-MI/EP layer can enhance the oxidation resistance of this composite. Considering the corrosion resistance, electromagnetic properties and oxidation resistance of this composite material, it provides an opportunity for valuable addition at commercial level.

Single-source-precursor derived SiOC ceramics with in-situ formed CNTs and core–shell structured CoSi@C nanoparticles towards excellent electromagnetic wave absorption properties

In this work, novel CNTs/CoSi/SiOC nanocomposite ceramics with<em> in-situ </em>formed multi-walled carbon nanotubes (CNTs) and core-shell structured CoSi@C nanoparticles were successfully prepared <em>via</em> a single-source-precursor derived ceramic approach. The polymeric precursor characterization as well as phase evolution, microstructure and electromagnetic wave (EMW) absorption properties of the ceramics was investigated in detail. The results show that the <em>in-situ</em> formed CNTs and magnetic CoSi@C nanoparticles provide a synergistic effect on both dielectric loss and magnetic loss, leading to outstanding EMW absorption properties of the ceramics annealed at only 1100 °C, as follows: 1) For the Co feeding 6.25 wt.%, the minimum reflection loss (RLmin) is -53.1 dB and the effective absorption bandwidth (EAB) is 4.96 GHz (7.12-12.08 GHz) with a ceramic-paraffin hybrid sample thickness of 3.10 mm, achieving the full X-band coverage; 2) For the Co feeding 9.09 wt.%, the RLmin value of -66.4 dB and the EAB value of 3.04 GHz (8.4-11.44 GHz) were achieved with a thickness of only 2.27 mm. Therefore, the present CNTs/CoSi/SiOC nanocomposite ceramics have potential applications for thin, lightweight and efficient EMW absorption in harsh environments.

Facile synthesis and excellent electromagnetic wave absorption properties of Air@RGO/CoNi hollow microspheres

The rational synergy of chemical composition and spatial nanostructures plays an important role in high-performance electromagnetic wave (EMW) absorption materials. Here, reduced graphene oxide (RGO) hollow microspheres loaded with CoNi alloy nanoparticles (Air@RGO/CoNi) were constructed by a facile water-in-oil emulsification route followed by high-temperature thermal treatment. The crystal structure, composition, microstructure, and magnetic properties of Air@RGO/CoNi were characterized by XRD, XPS, TEM, and VSM, respectively. The results demonstrated that the as-obtained Air@RGO/CoNi composites showed a uniform spherical morphology with a remarkably hollow structure. Impressively, nano-CoNi particles were compactly and uniformly distributed on the surface of RGO. Benefiting from the unique structure and compositional merits, the optimized Air@RGO/CoNi hollow microspheres exhibit superior (EMW) absorption performance. The minimum reflection loss (RLmin) value reached up to −56.16 dB at 13.67 GHz with a thin thickness of 2.55 mm and the widest effective absorption bandwidth (RL values are below −10 dB) covered 8.65 GHz (9.15–17.8 GHz) with a thinner thickness of 2.4 mm. Furthermore, possible EMW attenuation mechanisms had been proposed. Given these outstanding findings, we believe the as-fabricated Air@RGO/CoNi hollow microspheres can be promising candidates as highly microwave absorption materials with thin thickness, wide absorption bandwidth, and high absorption capacity.

Constructing hierarchical hollow flower-like MoO2/CoNi/NPC microspheres via water-in-oil system assisted supramolecular self-assembly for high-efficient electromagnetic wave absorption

Starting from the composition combination and structural design of materials, the novel high-efficiency absorber can be exploited. Herein, we constructed hollow flower-like MoO2/CoNi/NPC microspheres by virtue of supramolecular self-assembly in water-in-oil system and carbonization. The study found that when the mass ratio of the phosphomolybdic acid and dopamine hydrochloride was 3:4, and the oil phase solvent was glycol, microspheres presented outstanding electromagnetic wave (EMW) absorption performance. Its minimum reflection loss (RLmin) value was − 54 dB and the effective absorption bandwidth (EAB) was 4.72 GHz at 1.97 mm with the filling ratio of 35 wt%. When the thickness was only 1.7 mm, the widest EAB was up to 6.48 GHz (11.52–18 GHz), covering the entire Ku-band. The excellent EMW absorption performance was mainly attributed to the multiple scattering and enhanced impedance matching caused by the 3D flower-like hollow structure, as well as the strong polarization loss induced by the double-layer structure and Schottky contact. We also utilized the radar cross section (RCS) analysis method to simulate and calculate electromagnetic (EM) scattering performance of aluminum metal plates with absorbing coatings. The analysis results further manifested that MoO2/CoNi/NPC could be used as excellent absorber.

Interstitial boron-doped FeCoNiCr high entropy alloys with excellent electromagnetic-wave absorption and resistance to harsh environments

High entropy alloys (HEAs) are new promising electromagnetic-wave absorbing (EMA) materials due to their advantages in terms of corrosion resistance and high electrical conductivity. In the present work, FeCoNiCrBx (x = 0, 0.01, 0.05, 0.1, and 0.5) HEAs were prepared by a 3D high-energy ball-milling method. There was a phase change from face-centered cubic to body-centered cubic in the FeCoNiCrBx HEAs as the B content increased, which led to anomalous changes in mechanical properties, static magnetic properties and corrosion resistance. By tuning B contents, FeCoNiCrB0.05 HEAs delivered excellent electromagnetic-wave absorption performances. The minimum reflection loss (RLmin) values reached −62.5 dB at 11.74 GHz as thin as 2.11 mm, and the widest bandwidth was 5.78 GHz (11.90–17.68 GHz). In addition, B-doped FeCoNiCr HEAs had excellent mechanical properties, corrosion resistance and high temperature oxidation resistance. This work has important significance for the exploration of practical EMA materials that are resistant to harsh environments.

Nano metal oxide-intercalated MXene in-situ prepared by irradiation as effective electromagnetic wave absorbents

With the rapid development of electronic communication technology, electromagnetic pollution has become increasingly severe, leading to a growing need for absorption materials with excellent absorption performance. Herein, nano-sized oxide-intercalated Ti3C2T x MXene composites were synthesized via γ-radiation in an aqueous system. The synthesis was conducted in a reducing environment at room temperature, which effectively prevented the oxidation of MXene. Nano-oxides (Fe2O3 and Cu2O) were formed in situ between the MXene layers, forming a homogeneous oxide-intercalated structure. Compared with the original MXene, the intercalated structure significantly enhanced the electromagnetic wave absorption (EMA) performance of the MXene/Fe2O3 composite in the frequency range of 2–18 GHz, with smaller reflection loss (RL) (−58.7 dB), thinner thickness (2.35 mm). The RLmin value of the MXene/Cu2O composite was −50.9 dB (2.55 mm) and the effective frequency width was 4.88 GHz at a thickness of 1.3 mm. Compared with ordinary chemical methods, the γ-radiation is a facile and ‘green’ method that is suitable for large-scale preparation. The absorption mechanism was attributed to conductive loss, polarization loss, and magnetic loss, which contributed to efficient EMA. This work demonstrates that γ-radiation is a promising method for preparing nano metal oxide-intercalated MXene with enhanced EMA performance.