Wave Absorption Materials Research Articles

Heterogeneous interfaces and 3D foam structures synergize to build superior electromagnetic wave absorbers

Composite of magnetic materials with two-dimensional semiconductor Mxene is a common way to design electromagnetic wave absorbing (EWA) materials, but the lack of three-dimensional (3D) structure limits its application. Here, we will select one-dimensional Co3O4 chains with mild magnetic permeability to assemble with two-dimensional Ti3C2Tx MXene lamellae and coat the Co3O4/Ti3C2Tx MXene composite on the surface of modified melamine foam skeleton by vacuum impregnation method. The melamine foam skeleton provides good mechanical properties for the composite wave-absorbing mention and contributes to the construction of Ti3C2Tx MXene conductive network. The results show that Co3O4/Ti3C2Tx/MF exhibits the minimum reflection loss (RL) intensity value of −51.31 dB at 2.4 mm matching thickness and achieves the maximum effective absorption bandwidth (EAB) of 6.96 GHz at 2.3 mm matching thickness. The present work provides the feasibility for the preparation of highly efficient Ti3C2Tx MXene-based absorbers under low filling.

In situ-growth ultrathin hexagonal boron nitride /N-doped reduced graphene oxide composite aerogel for high performance of thermal insulation and electromagnetic wave absorption

Owing to widely used various electronic devices in the rapidly developing 5G era, electromagnetic wave pollution could not be avoided. Security risks which caused by electromagnetic wave pollution have gotten serious attention. Especially in combat environment, applied electromagnetic wave absorption materials and reduced the surface temperature of combat equipment key parts would effectively reduce the risks of radar and infrared recognition. Herein, we designed hexagonal boron nitride (h-BN)/N-doped reduced graphene oxide (rGO) composite aerogels with 3D parallel porous network hetero-structure for electromagnetic wave absorption and thermal insulation. The results showed that attributed to structure design, dielectric loss and optimized impedance match, h-BN/rGO composite aerogels exhibited excellent electromagnetic wave absorption and thermal insulation performance. When the matching thickness was 3.1 mm, the effective absorption bandwidth was achieved up to 10.13 GHz in 7.9–18 GHz, and the minimum reflection loss was −21.49 dB. The TGA results exhibited that the thermal decomposition temperature of rGO was 560 °C, h-BN/rGO was 674 °C, which increased by 114 °C. Infrared imaging analysis showed that the surface temperature of 10 mm thick h-BN/rGO aerogel was only 44.45 °C in external thermal environment of 200 °C, which could effectively isolate the heat to 155.55 °C. The excellent electromagnetic wave absorption performance and effective heat isolation performance not only enabled the application of h-BN/rGO aerogel in the stealth materials, but also had application prospects in the thermal management field.

Multifunctional Composite Material with Efficient Microwave Absorption and Ultra-High Thermal Conductivity

The increasing demands for electronic devices to achieve high miniaturization, functional integration, and wide bandwidth will exacerbate the heat generation and electromagnetic interference, which hinders the further development of electronic devices. Therefore, both the issues of microwave absorption and heat dissipation of materials need to be addressed simultaneously. Herein, a multifunctional composite material is proposed by periodic arrangement of copper pillars in a matrix, based on the wave-absorbing material. As a result, the equivalent thermal conductivity of the composite structure is nearly 35 times higher than the wave-absorbing matrix, with the area filling proportion of the thermal conductivity material being 3.14%. Meanwhile, the reflectivity of the composite structure merely changes from −15.05 dB to −13.70 dB. It is proved that the designed composite structure possesses both high thermal conduction and strong microwave absorption. The measured results accord well with the simulation results, which demonstrates that the thermal conductivity of the composite structure can reach more than 10W⋅m−1⋅K−1 without significant deterioration of the absorption performance.

Self-Assembled MoS2 Cladding for Corrosion Resistant and Frequency-Modulated Electromagnetic Wave Absorption Materials from X-Band to Ku-Band.

Reasonable composition design and controllable structure are effective strategies for harmonic electromagnetic wave (EMW) adsorption of multi-component composites. On this basis, the hybrid MoS2 /CoS2 /VN multilayer structure with the triple heterogeneous interface is prepared by simple stirring hydrothermal, which can satisfy the synergistic interaction between different components and obtain excellent EMW absorption performance. Due to the presence of multiple heterogeneous interfaces, MoS2 /CoS2 /VN composites will produce strong interfacial polarization, while the defects in the sample will become the center of polarization, resulting in dipole polarization. Due to the excellent structural design of MoS2 /CoS2 /VN composite material, MoS2 /CoS2 /VN composite material not only has good conductive loss and polarization loss, but also can maintain excellent stability in simulated seawater, and enhance corrosion resistance. The MoS2 /CoS2 /VN composite with dual functions of corrosion resistant and microwave absorption achieves a minimum reflection loss (RL) of -50.48dB and an effective absorption bandwidth of up to 5.76GHz, covering both the X-band and Ku-band. Finally, this study provides a strong reference for the development of EMW absorption materials based on transition metal nitrides.

Boosting of electromagnetic wave absorption properties by multiple reinforcement mechanisms of metals in FeNi3/MoS2@NSAPC composites

The prominence of electromagnetic wave pollution problems in military construction and people development has promoted extensive research on electromagnetic wave-absorbing materials. In this paper, a multi-metal-loaded N, S co-doped carbon-based composite wave-absorbing material has been prepared and converted into FeNi3/MoS2@NSAPC through heat treatment on this basis. FeNi3 and MoS2 construct a multiple loss mechanism to enhance the N, S double-doped carbon-based wave-absorbing material, which demonstrates by the effective absorption. The EAB of FeNi3/MoS2@NSAPC is broadened, and the RLmin is improved. The results show that a RLmin = -60.66 dB obtains at a sample thickness of 1.4 mm, an absorber doping of 15 wt%, and an EAB of 5.19 GHz. This work explains the enhancement effect of metal in the “metal/heteroatom/carbon” composite system. It provides a basis for the study of Ni- or Mo-doped carbon-based wave-absorbing materials.

Preparation of NiS/Ti3C2Tx co-doped with N and P at the covalent interface and its electromagnetic wave absorption properties

The harm of electromagnetic waves on human daily life has gradually received attention, and electromagnetic waves absorption materials have been used to address this issue. MXene, as a new type of 2D material, is a very promising electromagnetic wave absorption material. In this study, NiS nanoparticles were grown on the surface of S terminated Ti3C2Tx, and –S group acted as sulfur sources to construct Ti-S-Ni covalent interface directly in NiS/Ti3C2Tx composites. To further regulate the interface structure and electromagnetic properties, -P and -NH2 groups were also introduced onto the surface of MXene to achieve the N, P co-doping NiS/Ti3C2Tx composites with covalent interface. By investigating the electromagnetic wave absorption performance of the composites, it was found that N and P doping could effectively enhance the electron transfer rate at the interface and optimize the conduction loss, resulting in a significant improvement in performance. The minimum reflection loss was −50.6 dB at a frequency of 15.6 GHz, and the matching thickness was only 1.14 mm with an effective absorption bandwidth of 3.6 GHz. These results provide an important references and guidance for further research and development of high-performance electromagnetic wave absorption materials.

Effect of Mg content on microstructure and magnetic properties of ZnCoNiMg ferrite

Zn0.35Co0.05Ni0.60-xMgxFe1.96O4 ferrites (x = 0, 0.08, 0.16, 0.24, 0.32, 0.40) were prepared via a solid-state reaction. The phase composition and microstructure of the ferrite powders were analysed and the samples were determined to be pure spinel ferrites. At x = 0.24, the volume loss (PCV) of this ZnCoNiMg ferrite was as high as 829.23 mW/cm3. An increase in the amount of Mg substitution decreased the density of the ferrite sample, resulting in a larger PCV. Analysis of the magnetic hysteresis (M − H) loops revealed that ZnCoNiMg ferrites had the distinct magnetic properties of a soft magnetic ferrite. When x = 0.24, the reflection loss of this ZnCoNiMg ferrite sample had a minimum value of −36.713 dB under certain conditions. The more single domain particles, the more electromagnetic energy absorbed by ferromagnetic resonance effect. Based on these magnetic properties and absorption properties, the ZnCoNiMg ferrites have excellent potential for absorbing electromagnetic energy and are suitable for fabricating wave-absorbing materials.

Toward high performance microwave absorber by implanting La0.8CoO3 nanoparticles on rGO

The advent of “intelligent era” brings our life more convenience, but the electromagnetic radiation surrounding us not only greatly threatens human health, also makes information leakage and hidden trouble to national defense security. Hence, it is very urgent to develop novel electromagnetic wave absorption materials with lightweight, strong absorption, tunable absorption frequency and broad band absorption. Herein, a novel electromagnetic wave absorber is obtained by constructing La0.8CoO3-rGO nanocomposite, where La0.8CoO3 nanoparticles are anchored on graphene nanosheets by the electrostatic interaction between GO and La0.8CoO3. The effect of hybridization ratio of La0.8CoO3 and rGO on microwave absorption properties is carefully studied. The optimal reflection loss of La0.8CoO3-rGO nanocomposite can reach -62.34 dB with the maximum effective bandwidth of 6.08 GHz, presenting 48.78% and 245.45% increment compared to bare La0.8CoO3 nanoparticles, respectively. The effective absorption bandwidth covers a broad electromagnetic wave absorption band from Ku band to the C band by tailoring thickness of the absorbers from 2.4 mm to 4.4 mm. The fascinating electromagnetic wave absorption performance is attributed to the synergy effect of La0.8CoO3 and rGO, which integrates magnetic and dielectric loss caused by resonance, conductance, relaxation, and scattering loss. This result confirms that La0.8CoO3-rGO nanocomposite is potential candidates toward high-efficiency microwave absorbers and provides a valuable pathway for designing high-performance microwave attenuation materials in the future.

Broadband electromagnetic wave absorption using pure carbon aerogel by synergistically modulating propagation path and carbonization degree

Carbon materials were widely used as electromagnetic (EM) wave absorption due to their advantages of light weight, environmental resistance and high electrical conductivity. However, conventional means were typically available by combining carbon and other materials to achieve effective absorption. Herein, a novel strategy using pure carbon aerogel with oriented structure was reported to enhance the EM wave absorption by synergistically modulating the wave propagation path and carbonization degree. The aerogel contained proposed modified carbon nanofibers (MCNF) derived from bacterial cellulose (BC), and core-shell carbon nanofibers @ reduced oxide graphene (CNF@RGO). The oriented structure was induced by the temperature field, which manifests anisotropic EM constitutive parameters (εx ≠ εz) at different directions of incident wave. The carbonization degree was adjusted by varying the carbonization temperature. At the carbonization temperature of 700 °C, the maximum reflection loss and effective absorption bandwidth reached −53.94 dB and 7.14 GHz, respectively, enabling the aerogel to outperform its previous counterparts. To clarify the EM wave mode-of-action in conjunction, physical models of the aerogel were established in addition to finite element simulation and theoretical analysis. Notably, the aerogel with a density of 3.6 mg/cm3 featured ultra-light weight, superhydrophobicity, superior compressibility, and thermal insulation. Our work offers an efficient strategy for designing broadband and multifunctional EM wave absorption materials (EWAMs), promising great potentials in complex stealth equipment.

Ultra-broadband terahertz metamaterial absorber based on flexible wave-absorbing material

Metamaterial absorbers (MA) in terahertz (THz) based bands are receiving much attention for its potential applications. However, the limited bandwidth greatly reduces the further development and wide application of terahertz absorbers. To solve this problem, achieving ultra-broadband and efficient absorption characteristics in the terahertz band, we propose a nickel-based microstructure ultra-broadband MA that operates in the THz band. The proposed MA's electromagnetic wave absorption characteristics and physical absorption mechanism are modeled and numerically simulated. The research demonstrates that MA can achieve ultra-wideband efficient absorption covering the whole THz spectrum (0.1 THz-16 THz) with an overall absorption rate of over 95%. The proposed absorber has polarization-insensitive characteristics and achieves a broad-angle incidence with a range of almost 80°.allows a range of incidence angles up to 80°. The MA consists of only three classical metal-dielectric layer-metal structures, which greatly reduces the application cost. The proposed ultra-thin geometry super-surface scheme uses a flexible absorbing material (ECCOSORB AN-72), and the results show that the overall absorption efficiency are significantly improved after the application of the flexible absorbing material. This design presents a unique and innovative idea for the development and use of ultrawideband terahertz absorbers across various industries including terahertz stealth, sensor technology, imaging, and communication, as well as optoelectronics. The potential applications of this technology are vast and can greatly benefit these industries.

The Preparation of Flower Structure Composites Composed of Lamellar CuS and RGO and Its Electromagnetic‐Wave‐Absorption Performance

The harm of electromagnetic wave to human daily life has gradually received widespread attention, and CuS, with unique morphology and high specific surface area, and as a typical P‐type semiconductor material, has a large number of holes, which is conducive to electron transport, which have used as electromagnetic wave absorption (EMA) materials. EMA properties are affected by the morphology of materials, and therefore, flower‐shaped CuS/reduced graphene oxide (RGO) formed by self‐assembly of 2D lamellar structure CuS and RGO is prepared via a simple water bath–heating reaction. The content of RGO was adjusted to obtain the superior EMA properties. In the results, it is shown that the synthesized CuS/RGO with RGO of 10 mg has an excellent EMA capacity of strong reflection loss (RLmin = −46.8 dB) and broad effective absorption bandwidth (EAB = 4.9 GHz), at the thickness of 2.04 mm and the frequency of 12.1 GHz. The prepared flower‐shaped CuS/RGO composites has a strong interface polarization because of its 2D/2D heterostructure, and the 2D CuS was compounded with 2D RGO to form 3D conductive networks improving conductive loss capacity. In this article, the study on the influence of the morphology of transition‐metal sulfides–based composites on EMA field is enriched.

Synthesis of polymorphic CoSe2@MoSe2 microspheres with hollow and core-shell structures for electromagnetic wave absorption

Structure design and surface morphology control are effective strategies for preparing electromagnetic wave absorbing (EWA) materials with superior performance. In this work, Co microspheres with large diameters and rough surfaces were prepared by a simple solvothermal reaction. Then, through a one-pot hydrothermal reaction with Se and Mo sources, the Co was changed into polymorphic CoSe2 and loaded with a layer of MoSe2 nanosheets. Moreover, as the Co cations migrated outside to react with Se, free space was generated inside the spheres; thus, hollow and core-shell structures were achieved. The synthesized CoSe2@MoSe2 complex can cause dielectric and magnetic loss at the same time, achieving a minimum reflection loss of -45 dB and a maximum effective absorption bandwidth of 6 GHz. This work provides insight regarding the utility and massive synthesis of Co microspheres and advanced EWA materials with unique structures and diverse loss modes.

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.

Recent progress on the electromagnetic wave absorption of one-dimensional carbon-based nanomaterials

The rapid development of electronic information technology and the use of high-power electrical equipment have led to the increasingly serious problem of electromagnetic interference (EMI). Therefore, it is of great significance to study electromagnetic wave absorbing (EWA) materials with good absorbing properties. Compared with other wave absorbing materials, carbon-based nanomaterials such as silicon carbide (SiC), carbon nanotube (CNT), carbon nanowire (CNW) and carbon nanofiber (CNF) have the advantages of low density, large specific surface area/aspect ratio and excellent dielectric properties, which make them stand out. However, impedance mismatch caused by high conductivity and a single microwave loss mechanism seriously affect the absorption performance. In order to overcome the above shortcomings, surface modification, component control, structural design and other methods have been widely used in EWA materials in recent years to improve their absorption performance. In this review, we introduce the mechanism of microwave absorption and summarizes the research progress of one-dimensional carbon based nanomaterials and their composites. The preparation methods and microwave absorption properties of one-dimensional carbon based nanocomposites with different components, morphologies, and microstructures were discussed in detail. Finally, the challenges and future development prospects of one-dimensional carbon based nanomaterials were summarized, providing reference for the development of high-performance microwave absorbing materials.

Fabrication of 1D Ni nanochains@Zn2+ doping polypyrrole/reduced graphene oxide composites for high-performance electromagnetic wave absorption

Nowadays, electromagnetic radiation significantly impacts the normal operation of electronic devices and poses risks to human health. To effectively address this problem, the development of composites that exhibit exceptional electrochemical wave absorption through the combination of different components holds great promise. In this study, we have successfully prepared 1D Ni nanochains@Zn2+ doping polypyrrole/reduced graphene oxide (Ni NCs@Z-P/RGO, denoted as R-x) composites using a combination of hydrothermal, solvothermal, in situ polymerization, and physical blending methods. Notably, the R-2 composite demonstrates a remarkable minimum reflection loss (RLmin) of −63.58 dB at 14.3 GHz, with a thickness of 1.61 mm. Furthermore, the R-2 composite exhibits an impressive effective absorption bandwidth (EAB) of 5.08 GHz (11.92 GHz-17 GHz) at a thickness of 1.67 mm. These outstanding performances can be attributed to the synergistic effect of the different components and a well-thought-out structural design. Moreover, to showcase the practical applicability of the material, we have conducted additional investigations on the reduction of the radar cross-sectional area (RCS). The results strongly demonstrate that the prepared composite material, when used as a coating, effectively reduces the RCS value by up to 26.6 dB m2 for R-2 at θ = 0°. The experimental methods and simulations presented in this study hold significant potential for application in wave absorption research and practical implementations. Additionally, the prepared Ni NCs@Z-P/RGO composites demonstrate feasibility as wave-absorbing materials for future utilization.

Tuning N-doping to balance conductivity and polarization relaxation: A strategy for converting SiO2 from an electromagnetic wave-transmitting to absorbing material

Dielectric absorbing materials often need to adjust their conductivity and polarization effects to regulate their response to electromagnetic waves. Thus, the design concept often lies in improving the performance of conductive materials. On the contrary, using insulated wave-transmitting material as a wave-absorbing material and doping single atoms to improve conductivity are novel design mentalities. In this study, the SiO2 hybrid (N-SiO2-x), doped with N atoms and bound by Si-N bonds, was produced utilizing a one-step solvothermal technique without phase transition. Based on SiO2′s imbalanced polarization ability, this research modifies the material's conductivity loss by doping it with N, which successfully balances the polarization and conductivity and turns N-SiO2-x into a wave-absorbing material. The resulting N-SiO2-4 composite has a low matched thickness and a wide absorption band of 5.28 GHz with a minimum reflection loss value of −34.48 dB (2.5 mm). These novel findings offer original suggestions for the creation of SiO2-based wave-absorbing materials.

Magnetic NiFe2O4@FeNi3 core-shell nanospheres derived from FeNi-LDH precursor anchoring on rGO nanosheets for enhanced electromagnetic wave absorption

Graphene has been extensively utilized in the domain of electromagnetic wave (EMW) absorption materials because of its excellent electrical conductivity. However, the inferior impedance matching performance and the single loss mechanism vastly restrict the application. Hence, it's an effective strategy to solve these issues by introducing magnetic components. Notably, layer double hydroxide (LDH) is an appropriate template to obtain magnetic component materials. Considering that ferromagnetic metals such as Fe, Co, Ni, and their corresponding metal oxides are usually treated as magnetic components which are promising candidates for EMW absorption materials. Therefore, in this work, a FeNi-layered double hydroxide-reduced graphene oxide (FeNi-LDH-rGO) aerogel was synthesized through a series of processes such as electrostatic self-assembly, hydrothermal, freeze-drying, and annealing. The magnetic NiFe2O4@FeNi3 core-shell nanospheres were obtained from FeNi-LDH precursor, anchoring on rGO nanosheets after the annealing treatment. Furthermore, the effects of different mass ratios of LDH to GO as well as different annealing temperatures of LDH-rGO aerogel on the EMW absorption property and impedance matching performance were explored. As a consequence, the fabricated ultralight 600LDH-rGO 2:1 aerogel shows a broad effective absorption bandwidth (EAB) of 7.04 GHz at a thickness of 2.3 mm with a low filling content of only 6 wt% and a low density of 4.4 mg/cm3. In conclusion, the synthetic LDH-rGO aerogels offer an effective strategy for preparing EMW absorption materials that own three-dimensional porous network structure and unique magnetic NiFe2O4@FeNi3 core-shell structure nanospheres.

Carbon–ceramic nanofiber embedded with LDHs-derived composites for enhanced electromagnetic wave absorption

Hydrotalcite-like layered double hydroxides (LDHs) exhibit distinct microstructures and atomic compositions, and thus, they are expected to be superior microwave absorbing materials. However, preparation of excellent absorbers from LDHs is still a challenging task. Herein, NiCo-LDHs@SiC/C heterostructure composites were designed and then heat-treated to obtain NiCo@SiC/C nanofibers. Finally, with a synergistic effect of dielectric and magnetic losses, the minimum reflection loss value of the sample could reach −56.3 dB with a thickness of 2.7 mm, and the maximum effective bandwidth absorption reached 6.8 GHz at 2.3 mm. Moreover, the simulated radar cross-section indicates that the NiCo@SiC/C nanofibers well suppress the electromagnetic scattering from metal trench structure. This result further indicates the outstanding microwave absorption properties of the nanofibers. This study contributes to the development of LDH materials in the field of wave-absorbing materials, and is an important guideline for exploring efficient microwave absorbers with fibrous structure.

Anion-substitution interfacial engineering to construct C@MoS2 hierarchical nanocomposites for broadband electromagnetic wave absorption

Developing an effective strategy to regulate the interfacial properties of hierarchical structure is of great significance for preparation of high-performance electromagnetic wave absorption (EMA) materials. Ion-substitution can change intrinsic structure and properties of a materials, but its effect on the interfacial properties of hierarchical structure remained to be explored. Herein, we first constructed a C@MoS2 hierarchical structure via simple hydrothermal reaction, then used the ion-substitution strategy to replace the S atoms in MoS2 with O, F and Se, and finally obtained anion-substituted hierarchical structure (C@X-MoS2, X = O, F, Se). The results show that ion-substitution destroys the MoS2 crystal structure and realizes tunable dielectric properties of C@MoS2, which leads to further enhancement of overall interfacial polarization. After optimization, the absorption strength and width of C@O-MoS2 has been significantly improved. The minimum reflection loss (RLmin) reaches −62.17 dB, and the maximum effective absorption bandwidth (EABmax) is 7.0 GHz. The simulation results show the obtained absorbent can greatly reduce the radar cross section of target, indicating it has broad application potential. Therefore, this work provides a novel method for regulation of EMA performance of hierarchical structure and preparation of high-performance absorbents.

Interfacial covalent bonding of Ni doped MoS2/TiO2/Ti3C2Tx composites for electromagnetic wave absorption performance

Two-dimensional MXene and its composites are among the most attractive electromagnetic wave absorption (EMA) materials due to their unique structure. While previous studies have investigated 2D/2D MoS2/Ti3C2Tx heterojunctions for EMA, there is still a need for further adjustments to interface structure to enhance polarized electron density and electron transfer capacity. In this study, Cl-Ti3C2Tx was prepared by Lewis acid molten salt etching of Ti3AlC2, and S-Ti3C2Tx was prepared by replacing Cl with S. MoS2 nanosheets were grown on the surface of S-Ti3C2Tx by a simple hydrothermal method, forming a Ti-S-Mo covalent interface. The EMA properties of the composites were further optimized by adjusting the interface oriented polarization and electronic structure through Ni doping. Compared to MoS2/TiO2/Ti3C2Tx, the electromagnetic wave absorption performance of Ni-MoS2/TiO2/Ti3C2Tx had been significantly improved. When the Ni doping amount was 0.086 mmol, the minimum reflection loss of Ni-MoS2/TiO2/Ti3C2Tx could reach −48.04 dB at 8.64 GHz, with an effective absorption bandwidth of 3.28 GHz. This study provides theoretical basis and experimental evidence for the follow-up research of MXene-based composite EMA materials.