Electromagnetic Radiation Pollution Research Articles

Enhanced electromagnetic wave absorption in ultrathin cement-based composites with integrated multi-dimensional carbon materials

The challenges posed by electromagnetic waves (EMW) cause significant interference in electronic device operation, jeopardizing information security and disturbing normal biological functions, which necessitate attention. Multi-scale carbon/cement-based composites were developed for EMW absorption by integrating multi-dimensional carbon materials, including carbon nanotubes (1D), graphene (2D), and modified carbon microspheres (3D). These composites demonstrate exceptional EMW absorption capabilities, with a minimum reflection loss (RLmin) of −44.32 dB and an effective absorption bandwidth (EAB) of 3.644 GHz at X band, merely having a thickness of 1.90 mm. Furthermore, the superior EMW absorption properties of these composites are confirmed through radar cross-section (RCS) simulation and electric field distribution analysis. A small house is constructed of designed three-layer multi-scale carbon/cement-based composites in which the actual EMW reflection losses are less than –10 dB within the whole test frequency range, and these composites can effectively obstruct 5 G mobile phone signals. Therefore, multi-scale carbon/cement-based composites could be promising candidates for effectively solving the increasingly serious problem of electromagnetic radiation pollution.

Nickel-Fe3O4@Graphene coated lightweight carbonized wood for efficient electromagnetic interference shielding

The miniaturization and integration of electronic equipment promote electromagnetic effect radiation pollution more and more serious. The lightweight, renewable electromagnetic interference (EMI) shielding materials is urgently needed. This study developed a high temperature carbonization, Fe3O4@Graphene impregnation, and electroless Ni technique to construct a carbonized wood composite with strong EMI shielding performance using sustainable natural wood as the raw material. The Fe3O4@Graphene is distributed throughout the carbonized wood to provide the conductivity and magnetism of the reinforced composite material, and provide more interfaces to increase the dielectric loss and magnetic loss, thereby exhibiting excellent EMI shielding performance. The results show that at low thickness (2 mm) and ultra-low density (0.284 g/cm3), the CWN-7 composite exhibits excellent EMI shielding effectiveness of up to 84.2 dB in the whole X-band (8.2–12.4 GHz). At the same time, it has extraordinary compressive strength and good thermal insulation performance. This study offers a different method for creating composite multifunctional electromagnetic shields out of carbonized green wood.

Multiple birds with one stone: A new type of PPy/Fe3O4/rGO multifunctional composite fabric for wave absorption, UV resistance, anti-static and thermal insulation

To solve the problem of electromagnetic radiation pollution, it is especially important to develop electromagnetic wave-absorbing materials with excellent performance. The preparation of composite multifunctional textile materials with excellent wave-absorbing properties is one of the research hotspots for practical personal protection applications. In this work, PPy/Fe3O4/rGO polyester/cotton composite fabrics were prepared by impregnation, chemical reduction, chemical co-precipitation and in situ polymerization. When the thickness is 0.97 mm, the minimum reflection loss (RLmin) of PPy/Fe3O4/rGO polyester/cotton composite fabric is −12.12 dB, and the effective absorption bandwidth (EAB) is 4.7 GHz, which is excellent in wave absorption. Meanwhile, the PPy/Fe3O4/rGO polyester/cotton composite fabrics have excellent UV resistance (UV transmittance ratio of UVA and UVB bands as low as 0.02 %, UPF value of 100+), antistatic properties (static voltage half-life of 0.2 s), and excellent thermal management properties (thermal conductivity as low as 0.05796 W/(m·K)), and so on. The PPy/Fe3O4/rGO polyester/cotton composite fabrics prepared in this study are suitable for a variety of application scenarios, such as individual electromagnetic protection, individual protection in extremely cold environments, and individual heating physiotherapy, which is of great reference significance for the research of wearable individual protective textile materials.

Lightweight multifunctional electromagnetic shielding composites achieved by depositing Ag@MXene hybrid particles on wood-based aerogel

As electronic devices become more integrated into daily life, concerns about electromagnetic radiation pollution become more severe, despite the increased portability they offer. Designing a lightweight and multifunctional material that is environmentally friendly, thermally conductive, and electromagnetically shielded is urgently needed. In this work, novel composites were fabricated by incorporating Ag@MXene hybrid particles into the wood-based aerogel. Compared with the aerogels containing only Ag nanoparticles (AgNPs) or MXene, the Ag@MXene/W aerogel exhibited more homogeneous dispersion of unfolded MXene nanosheets and more AgNPs but higher porosity (97.1 %) and smaller density (0.047 g cm−3). Consequently, the Ag@MXene/W aerogel exhibited high compressibility and low energy dissipation, remarkable strain sensitivity, impressive electrical conductivity (33.9 S m−1) and specific electromagnetic shielding efficiency (5765.96 dB cm2 g−1), and high thermal conductivity (0.81 W m−1 K−1). The excellent comprehensive performances ensure that the aerogel has wide applications in various fields, including electromagnetic pollution protection, strain detecting, and thermal management, etc.

ANALYSIS OF THE FACTORS CONTRIBUTING TO ENVIRONMENTAL POLLUTION IN THE SUBCARPATHIAN PROVINCE

The work presents an examination of Poland's environmental condition, with a focus on the contamination of air and surface waters by various chemical elements. The composition and quality of the air impact ecosystems, plant growth, the animal kingdom, and shape human living conditions. These factors play a significant role in driving global climate change. The repercussions of air pollution encompass phenomena such as smog, acid rain, ozone layer depletion, as well as impacts on industrial and municipal facilities, contributing to global warming. The article conducts an analysis of air pollution, surface water contamination, and electromagnetic radiation pollution in Subcarpathian, utilizing the city of Stalowa Wola and the Stalowa Wola county as case studies. This choice is informed by the fact that Stalowa Wola stands as one of the largest industrial cities in the Subcarpathian Voivodeship, suggesting that environmental pollution levels in this county might surpass those in other regions. The article also delineates the features of air and surface water pollution, along with electromagnetic radiation characteristics. It scrutinizes pollution sources in the mentioned county, explicates the causes of such pollution, and proposes strategies for environmental amelioration. The analysis of the environmental status of Stalowa Wola county during the years 2018 to 2020 is presented, accompanied by recommendations for initiatives that could enhance its condition. The research findings indicate that the condition of uniform segments of surface waters, as evaluated through conducted studies, is deemed poor. The discharge of wastewater from specific pollution points, particularly wastewater from municipal origins, emerges as the predominant cause of subpar water quality.

Electromagnetic shielding Janus membrane for direct current‐type pressure and sliding sensing

AbstractFacing increasing electromagnetic radiation pollution, soft sensors with electromagnetic interference (EMI) shielding is highly desirable. Here, flexible electromagnetic shielding [polyacrylonitrile/Fe3O4/polyaniline]//[multiwalled carbon nanotube/polyvinyl pyrrolidone] (denoted [PAN/Fe3O4/PANI]//[MWCNT/PVP]) Janus membrane is reported for pressure and sliding sensing. The [PAN/Fe3O4/PANI] layer of Janus membrane as the force and sliding sensing unit can generate direct current‐type (DC‐type) voltage signals by conducting polymer/metal Schottky junction, whereas [MWCNT/PVP] layer serves as main electromagnetic shielding unit. Under the vertical force and horizontal sliding of aluminum (Al) foil, it can output DC‐type voltage signals based on the Schottky contact. The performance of [PAN/Fe3O4/PANI]//[MWCNT/PVP] Janus membrane for pressure and sliding sensing is appropriately explored and assessed. Moreover, the Janus membrane exhibits excellent shielding effects with average EMI shielding effectiveness (SE) of 37.54 dB in 8.2–12.4 GHz (X‐Band) frequency ranges. Thus, based on the asymmetrical double‐layer structure, soft DC‐type sensor with EMI shielding is achieved, showing utilization potential in wearable electronics and intelligent robots.

Study on the space field reconstruction method of the radial basis function of electromagnetic radiation under optimal parameters

ABSTRACT Electromagnetic radiation (EM) pollution has a certain impact on human life and health, and the reconstruction of the EM space field in this paper is of great practical significance for EM analysis and research. The radial basis function (RBF) sufficiently considers the influence of each sampling point and is more suitable for reconstructing the EM space field than other spatial interpolation methods. Currently, when RBF is used to reconstruct the EM space field, the optimal determination of the basis function and shape parameter (SP) is rarely considered. This ultimately leads to low reconstruction accuracy of the EM space field. Therefore, in this paper, the particle swarm optimization (PSO) is used to calculate the optimal SP of the RBF. On this basis, reliable EM space field reconstruction is performed, which helps people understand the EM distribution characteristics in actual situations from a visual perspective. The EM sampling data of a region on the Yunnan Normal University campus are used as the data source, and the RBF under the optimal parameters is used for EM reconstruction. The accuracy of its interpolation results is evaluated and compared and analyzed with inverse distance weighting (IDW) after distance index optimization. The results show that the RBF under optimal parameters reconstructs the EM space field with high accuracy and good effect, which can truly reflect the actual distribution of EM.

Polarization-insensitive, frequency- and amplitude-tunable transparent microwave absorber based on graphene metasurface

Transparent and flexible metamaterial absorbers can provide solutions for electromagnetic compatibility and electromagnetic radiation pollution. They also play key roles in platforms with optical windows that require low detectability and immunity to electromagnetic interference. Due to the lack of active adaptability to complex electromagnetic environments, early metamaterial absorbers need to be redesigned and manufactured once the application scenarios change. The new two-dimensional material graphene provides a practical technical approach for the realization of transparent tunable absorbers. In this work, we propose a polarization-insensitive dual-tunable microwave absorber based on graphene metasurface. By controlling two separate bias voltages applied to patterned graphene or continuous graphene, independent dynamic regulation of electromagnetic wave absorption frequency and amplitude is achieved. It also possesses the features of optical transparency and flexibility. The measurement results show that the absorption frequency can be shifted from 9.8 to 11.3 GHz, the peak absorption rate at each absorption frequency remains above 99.6%, and the reflection amplitude modulation can be achieved simultaneously at each absorption frequency. The proposed absorber integrates multiple modulation functions for electromagnetic waves, and the overall structure is optically transparent and flexible. Therefore, it can contribute to many practical wave absorbing applications.

Enhanced microwave absorption properties of conducting polymer@graphene composite to counteract electromagnetic radiation pollution: green EMI shielding.

Conducting polymers have been thoroughly investigated and found to have extensive applications in the fields of microwave absorption and electromagnetic (EM) shielding owing to their distinctive characteristics and adaptability. In the present work, conducting polymer (PEDOT and polyaniline) and graphene composites were prepared via an in situ chemical polymerization technique. Further, these composite materials were characterized to determine their potential to address the issue of EM radiation pollution in the microwave frequency (12.4 GHz to 18 GHz). The PEDOT/graphene composites exhibited significant shielding effectiveness of up to 46.53 dB, achieving a green index (gs) of 1.17. Also, absorption was observed to be the dominant shielding mechanism in all the samples owing to significant dielectric losses (ε''/ε' ≈ 1.9-3.1) and microwave conductivity (σs = 19.9-73.6 S m-1) in the samples at 18 GHz. Both dielectric loss and conduction loss occurred because of the strong interactions involving polarization, charge propagation, and the creation of conductive routes through the incorporation of graphene in the polymer matrix. These properties/shielding results indicate the potential of the composites to be used as lightweight EM shielding materials. These materials are suitable shield materials for electronic devices to protect them from harmful electromagnetic radiation, making them vital in various applications.

Lightweight and high-strength polyarylene ether nitrile-based composites for efficient electromagnetic interference shielding

Abstract The proliferation of electronic devices and the widespread adoption of microwave-based technologies have resulted in a notable rise in electromagnetic radiation pollution. In present work, a novel flexible lightweight polyarylene ether nitrile (PEN)-based composite for efficient electromagnetic interference (EMI) shielding was prepared by introducing dual-loss hybrid material (PKMWCNT@Fe3O4) into PEN via non-solvent induce phase separation method and assembling it layer-by-layer with carbon fiber (CF) fabric. The porous morphology of the PEN layer, the electrical conductivity of the CF fabric, and the dual-loss property of the filler enable the material to reflect and absorb electromagnetic waves multiple times, resulting in superior electromagnetic shielding performance. With the addition of PKMWCNT@Fe3O4 at a mass fraction of 50%, the EMI SE T and specific shielding effectiveness SSE/t can reach up to 47.08 dB and 617 dB cm2/g, respectively, indicating absorption dominated shielding mechanism. Furthermore, the material exhibits a lightweight nature with a density of 0.55 g/cm3, and excellent mechanical properties, including a tensile strength of 43.98 MPa and elongation at break of 43.32%. This work presents a new approach to prepare high-performance composites that are both lightweight and resistant to secondary contamination by electromagnetic waves.

Fabrication of electrically conductive interconnected microcellular thermoplastic elastomeric foam composite for absorption dominating electromagnetic interference shielding with ultra low reflection

AbstractThe elevated rates of electromagnetic radiation pollution, resulting from the growing need for wireless communication systems and electronic gadgets, have sparked interest in creating shielding materials that are lightweight, flexible, non‐corrosive, simply processable, and affordable. In this study, a collection of microcellular nanocomposites based on ethylene octane copolymer (EOC) were created utilizing Vulcan XC 72 conductive carbon black (VCB) by a dual mixing process involving both melt and solution mixing. A chemical blowing agent was utilized to induce the cellular architecture in the composite, resulting in its lightweight nature (maximum density of 0.65 g/cc). The composite foam, when loaded with 30 parts per hundred of volume (phr) of VCB, displays a conductive network and also achieves an electromagnetic interference (EMI) shielding efficiency of 23.2 decibels (dB), satisfying commercial requirements. Furthermore, the findings indicated that the composite's cellular structure significantly influences the absorption‐dominated EMI shielding mechanism with an absorption rate of 89%–94% and a specific shielding effectiveness of 194 dBcm2/g within the frequency range of 8.2–12.4 GHz (X band). The foam composite also demonstrated as a thermal management system, with a maximum thermal conductivity of 0.3 W/mK. As a result, this lightweight, easily processable, electrical conductive EOC/VCB polymer composite foams are projected to be used as EMI shielding materials in electronics, cars, and packaging.Highlights Fabrication of lightweight microcellular Carbon black‐loaded EOC composite Rheological, mechanical, and thermal properties of foam composites The cell density filled composites reduces by the cellular foam structures Carbon black pronouncedly enhanced the electrical conductivity of foam composite An absorption‐dominated shielding effectiveness with ultra‐low reflection.

Microwave Absorption Performance of One-dimensional Mixed Metal Oxide Nanocomposite

Abstract: Microwave-absorbing materials have received numerous attentions in terms of their key roles in the fields of stealth technology and controlling electromagnetic radiation pollution. In this paper, we aim to develop one-dimensional CoFe2O4-TiO2 mixed metal oxide nanocomposite via combination of sol-gel method and electrospinning technique. and investigate its microwave absorbing capability. The phase evolution from precursor fiber to final product and corresponding micromorphology are characterized, and microwave absorption performance for different CoFe2O4-TiO2 composite fibers are investigated with a vector network analyzer in 2-18 GHz. The prepared CoFe2O4-TiO2 mixed metal oxide composite fibers exhibit excellent microwave absorbing ability. The low reflection loss can reach -32.8 dB, and the maximum effective bandwidth is up to 6 GHz (12-18 GHz) at the thickness of 4 mm. The results further reveal that the lightweight mixed metal oxide composite fiber is promising for applications in electromagnetic attenuation and other related research fields.

A Smart Amorphous Wire Composite with Tunable Electromagnetic Shielding

Nowadays, in view of the increasingly serious problems of electromagnetic interference (EMI) and radiation pollution, smart EMI shielding materials with tunable shielding effectiveness (SE), especially “On/Off” switchable capability, are highly desirable. Herein, Co‐based amorphous wires (AWs) with excellent soft magnetic and mechanical properties are regularly arranged on a 3D‐printed mold as tunable EMI shielding composites. The EMI SE can be easily tuned in the range of ≈0.6–24.7 dB by way of rotation, which has been confirmed to be an effective way to achieve free tuning of EMI SE by simulation. In addition, by compositing AWs with reduced graphene oxide and constructing a double‐layer structure with a gap of 1/4 wavelength in the X‐band, a much wider SE tuning range of ≈1.0–57.7 dB is further realized. The representative “On/Off” switchable shielding capability that can switch between EM transmission and effective shielding, together with the wide SE tuning range larger than 50 dB, shows the great potential of Co‐based AW composites in smart EMI shielding applications.

Sandwich-structured polyacrylate composite films for electromagnetic interference shielding with low reflection characteristics

The sandwich-structured polyacrylate composite films containing carbon nanotubes (CNTs) and magnetic fillers (Ni or Fe3O4) were prepared by spray coating and LBL-casting. CNTs were uniformly distributed in polyacrylate (PEA) matrix to prepare middle layer and magnetic fillers exhibited good distribution in PEA matrix as outer layer to reduce the secondary electromagnetic radiation pollution. The average electromagnetic interference shielding effectiveness (EMI SE) owns the highest value of 38.2 dB in 6-Fe3O4/MWCNT/6-Fe3O4 film, and the absorption coefficient (A) of the film account for about 0.56. The results indicated that this film shows absorption-dominated EMI shielding properties. It is mainly attributed to sandwich structure of the composite film, synergistic electric/magnetic losses and polarization relaxation loss to further attenuate electromagnetic wave. The microwave can undergo a unique “absorb-reflect-reabsorb” process. Therefore, polyacrylate composite films with low reflection and high EMI shielding can be used in small-scale and sophisticated electronic devices.

One-step in-situ preparation of C/TiO2@rGO aerogel derived from Ti3C2Tx MXene for integrating microwave absorption, electromagnetic interference shielding and catalytic degradation of antibiotics

The worsening electromagnetic radiation and water pollution are severely threatening people's living environment. Developing multifunctional nanomaterials to reduce the electromagnetic radiation and remove the pollutants from the aqueous solutions is attracting wide interest in the field of environmental protection. Now, a multifunctional C/TiO2@reduced graphene oxide (rGO) aerogel integrating microwave absorption, electromagnetic interference (EMI) shielding and photocatalytic degradation is prepared by one-step in-situ preparation derived from Ti3C2Tx MXene. As expected, the composite exhibits excellent microwave absorption performance at an ultra-low filler loading ratio of 3 wt% with minimum reflection loss (RLmin) of −60.24 dB and effective absorption bandwidth (EAB) of 6.16 GHz. It is demonstrated that the superior microwave absorption behavior is attributed to the unique interfacial construction and porous structure as well as the synergistic effect of enhanced dielectric loss and good impedance matching. Impressively, the as-obtained samples also display a superior EMI shielding efficiency of 52.63 dB and high photocatalytic degradation efficiencies of 96.5 % and 91.6 % for antibiotic tetracycline (TC) and oxytetracycline (OTC), respectively, which reveals its multiple utility essence. Consequently, this work provides a promising multifunctional material for integrated environmental applications and offers an innovative solution to current environmental problems.

Construction of CoFe2O4/MXene hybrids with plentiful heterointerfaces for high-performance electromagnetic wave absorption through dielectric-magnetic cooperation strategy

Developing high-efficiency electromagnetic wave (EMW) absorption materials is urgently demanded but challenging to tackle the increasingly serious electromagnetic radiation pollution. In this regard, a novel multi-heterostructure hybrid consisting of two-dimensional MXene nanosheets and zero-dimensional CoFe2O4 nanoparticles was successfully constructed by facile solvothermal approach. Benefiting from the improved impedance matching, electric/magnetic coupling effect, polarization loss originated from numerous heterointerfaces and defects, as well as multiple reflection and scattering, the resultant CoFe2O4/MXene (CM) hybrids realize brilliant EMW absorption performance. Notably, the final EMW absorption performance of CM hybrids is closely associated with their electromagnetic parameters, which could be facilely regulated by adjusting the ratios of CoFe2O4 to MXene. The resultant CM hybrids present the optimal minimum reflection loss (RLmin) of −58.8 dB at 9.59 GHz with a tiny thickness of 2.36 mm and exhibit a broad effective absorption bandwidth (EAB) of 6.3 GHz (11.7–18.0 GHz) at a thickness of only 2.03 mm, which covers the whole Ku band. In addition, the effectiveness of CM hybrids as highly efficient EMW absorption materials in real condition is intuitively demonstrated by the radar cross section simulation. This work paves a new route for synthesizing high-performance MXene-based EMW absorption materials with superior practical application value.

Structural engineering of porous biochar loaded with ferromagnetic/anti-ferromagnetic NiCo2O4/CoO for excellent electromagnetic dissipation with flexible and self-cleaning properties

Design of multi-functional microwave absorption materials with strong dissipation ability is a practical approach to address the current issue of electromagnetic radiation pollution. Herein, based on the exchange bias interaction between ferromagnetic and anti-ferromagnetic interfaces, a series of absorbers composed of the porous biochar loaded with ferromagnetic/anti-ferromagnetic NiCo2O4/CoO were successfully prepared via a fairly simple process of one-step calcination. By regulating the calcination temperature, the pore size and porosity of porous carbon, morphology of loaded NPs as well as the electromagnetic response property and impedance matching characteristic in such composites can be modulated. The porous biochar/NiCo2O4/CoO composite prepared under 350 °C possesses a remarkable electromagnetic absorption reflection loss (RL) of –48.41 dB at 9.12 GHz with 2.5 mm thickness, and the effective absorption bandwidth (EAB) of 4.32 GHz with 2.2 mm thickness is located at X band, this is owing to the strong coupling effect of multiple dielectric polarizations, magnetic resonances, and eddy current consumption under matched impedance. In addition, the microwave absorbing patch prepared with this composite exhibits a well-hydrophobic property for self-cleaning function, and the large extensibility with substantial breaking strength endows its practical usage as a flexible absorber.

The synthesis of porous carbon material derived from coal liquefied residue and its electromagnetic wave absorption

To solve the problem of electromagnetic radiation pollution, it is necessary to develop an economic and environmentally friendly way of producing efficient electromagnetic wave absorbing materials. Carbon-based materials have attracted much attention but finding suitable precursors and ways of producing defined pore structures are still challenges. This work reported a facile method to produce porous carbon by using coal liquefaction oil residue as carbon source. The produced porous skeletons should be attributed to the generated Na2CO3 templates and CO2 gas during the thermal decomposition process of NaHCO3 templates. It is found that changing the pore structure not only adjusts the impedance matching of the material but also increases the length of the electromagnetic wave transmission path and increases dielectric loss. With the combined effect of multiple electromagnetic loss mechanisms, the material has excellent electromagnetic wave absorption. Specifically, with a filler loading of only 10% and a thickness of 2.03 mm, the obtained carbon material has a reflection loss value of −60.28 dB and an effective absorption bandwidth of 5.36 GHz. This work provides a new approach to developing high-performance carbon-based electromagnetic wave absorbing materials and also offers a new idea for the high value-added use of coal liquefaction oil residue products.

Fabrication of silver/polyaniline/aminated graphene oxide coated textiles for electromagnetic interference shielding application within the different bands of frequency

The interference and pollution caused by electromagnetic radiation have become serious concerns due to the advancements in telecommunications and electronic technology. Highly efficient electromagnetic interference (EMI) shielding materials are thus urgently needed. The primary purpose of this research is to design silver/polyaniline/aminated graphene oxide based EMI shielding textiles over a wide frequency range to protect humans from harmful electromagnetic radiation. For this, layer by layer strategy was adapted to develop conductive textiles for remarkable EMI shielding performance in a wide range of frequency. Electroless plating of silver was performed on polyaniline-based aminated graphene oxide (AGO) fabric to achieve a multilayered structure. Our shielding effectiveness (SE) findings demonstrate that these modified fabrics provide excellent EMI shielding efficiency across multiple frequency bands, including UHF, L-band, S-band, C-band, and X-band. The modified fabric showed EMI SE greater than 40 dB in all bands of frequency and it is greater than the commercial requirement. Moreover, these fabrics are antibacterial and hydrophobic in nature and the greatest antibacterial activity was exhibited by silver/polyaniline/aminated graphene oxide fabric about 97 % and 99% against E.coli and S. aureus respectively. These modified fabrics have the potential to significantly reduce electromagnetic radiation pollution and protect human life owing to their exceptional EMI shielding properties.

Fabrication of nitrogen-doped reduced graphene oxide/porous magnesium ferrite@silica dioxide composite with excellent dual-band electromagnetic absorption performance

In order to solve the increasingly serious problem of electromagnetic radiation pollution, it is urgent to develop advanced electromagnetic wave (EMW) absorbers with low filling ratio, wide bandwidth and strong absorption. In this work, nitrogen-doped reduced graphene oxide/porous magnesium ferrite@silicon dioxide (NRGO/MgFe2O4@SiO2) composite was prepared by a three-step route of solvothermal reaction, Stöber method and hydrothermal synthesis. The results of microscopic morphology analysis showed that a large number of MgFe2O4@SiO2 core–shell microspheres were uniformly distributed on the wrinkled surface of NRGO in the ternary composite. Furthermore, the effect of dielectric SiO2 coating on the electromagnetic parameters and EMW absorption performance of NRGO/MgFe2O4 composite was also investigated. Significantly, the EMW absorption capacity of the obtained ternary composite was better than that of the other two binary composites. When the filling ratio was 20.0 wt.% and the matching thickness was 2.0 mm, the ternary composite exhibited the widest absorption bandwidth of 6.2 GHz and the strong absorption strength of -58.8 dB at 14.6 GHz (Ku band). It was worth noting that when the thickness was increased to 4.2 mm, the optimal reflection loss of -61.0 dB was achieved at 5.8 GHz (C band). In addition, the potential EMW absorption mechanism was also proposed. Therefore, this work would provide a valuable reference for the preparation of graphene-based magnetic composites as lightweight, broadband and efficient EMW absorbers.