Research progress on spherical carbon-based electromagnetic wave absorbing composites

Carbon, Год журнала: 2024, Номер 227, С. 119244 - 119244

Опубликована: Май 13, 2024

Electromagnetic waves constitute an essential element of societal progress, and the environmental impact resulting from using electromagnetic warrants significant considerations. Carbon materials have garnered considerable attention in functional domain owing to their remarkable electrical conductivity dielectric characteristics. Notably, spherical carbon materials, characterized by substantial specific surface area tunable properties, emerged as efficient additives for microwave absorbers. These excel absorbing energy while minimizing dissipation. When incorporated into absorbers varying compositions, sizes, morphologies, these spheres facilitate synergistic operation multiple loss mechanisms, containing conductive loss, magnetic polarization loss. This concerted action significantly enhances wave absorption performance. paper offers a comprehensive review advancements sphere-based designed waves. It also furnishes intricate exposition methodologies employed preparation meticulous analysis The summarizes microstructural attributes mechanisms governing various sphere configurations, considering factors such composition, morphology, size, structure. In conclusion, this study forecasts potentials nanomaterials realm waves, along with assessment forthcoming research focal points conceivable challenges.

Язык: Английский

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Designing flower-like MOFs-derived N-doped carbon nanotubes encapsulated magnetic NiCo composites with multi-heterointerfaces for efficient electromagnetic wave absorption

Journal of Colloid and Interface Science, Год журнала: 2023, Номер 646, С. 265 - 274

Опубликована: Май 12, 2023

Язык: Английский

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One-step in-situ preparation of C/TiO2@rGO aerogel derived from Ti3C2T MXene for integrating microwave absorption, electromagnetic interference shielding and catalytic degradation of antibiotics

Carbon, Год журнала: 2023, Номер 217, С. 118610 - 118610

Опубликована: Ноя. 13, 2023

Язык: Английский

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Phase Engineering on Amorphous/Crystalline γ‐Fe₂O₃ Nanosheets for Boosting Dielectric Loss and High‐Performance Microwave Absorption

Advanced Functional Materials, Год журнала: 2023, Номер 34(10)

Опубликована: Ноя. 22, 2023

Abstract To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward radiation. Herein, amorphous/crystalline γ‐Fe 2 O 3 nanosheets (Fe‐H) are carefully fabricated through a controlled annealing process. matched Fermi levels formed on both sides of interface not only provides interfacial polarizations but also facilitates transport electrons with scattering over whole Fe‐H nanosheets. Thereby, conduction loss dielectric polarization relaxation promoted, leading strengthened attenuation electromagnetic wave as‐synthesized sample exhibited minimum reflection ‐89.5 dB centered at thickness 2.00 mm, associated an effective absorption bandwidth (reflection ≤ ‐10 dB) reaching 6.45 GHz. All these behaviors superior its pure amorphous absorbent bare crystalline counterpart. Furthermore, this strategy valid when extended Co Ni based oxides, suggesting universality generality for promoting absorption. Henceforth, study indicates favorable synthesis application materials as absorbents.

Язык: Английский

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Insights into Civilian Electromagnetic Absorption Materials: Challenges and Innovative Solutions

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Фев. 5, 2024

Abstract The emergence and widespread adoption of fifth‐generation wireless technology in civilian sectors have advanced the information revolution, while simultaneously leading to a variety negative impacts. Foremost issues domain include electromagnetic (EM) pollution, interference, inefficient use EM energy. Despite growing global awareness, progress devising effective solutions is sluggish, underlining complexity these issues. delay addressing concerns arises from several factors, including considerable gap comprehensive understanding absence unified stance on critical Moreover, new challenges like interference energy inefficiency indicates clear need for innovative ideas approaches. Addressing extends beyond inherent properties absorbers, requiring combination tailored macro‐structural designs external field management solution. This situation emphasizes urgent diverse strategies creative thinking navigate posed by perspective underscores identified systematically proposes practical approaches each, aiming foster both conversation action this crucial area. insights provided are expected substantially aid confronting alleviating pressing concerns.

Язык: Английский

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N, O‐Doped Walnut‐Like Porous Carbon Composite Microspheres Loaded with Fe/Co Nanoparticles for Adjustable Electromagnetic Wave Absorption

Small, Год журнала: 2024, Номер 20(20)

Опубликована: Янв. 11, 2024

Abstract This study addresses the challenge of designing simple and environmentally friendly methods for preparation effective electromagnetic wave (EMW) absorbing materials with tailored microstructures multi‐component regulation. N, O doped walnut‐like porous carbon composite microspheres loaded FeCo nanoparticles (WPCM/Fe–Co) are synthesized through high‐temperature carbonization combined soap‐free emulsion polymerization hydrothermal methods, avoiding use toxic solvents complex conditions. The incorporation magnetic components enhances loss, complementing dielectric loss to optimize EMW attenuation. unique morphology further improves impedance matching. proportions Fe Co can be adjusted regulate material's reflection thickness, bandwidth, allowing fine‐tuning absorption performance. At a low filling ratio (16.7%), optimal WPCM/Fe–Co composites exhibit minimum ( RL min ) −48.34 dB (10.33 GHz, 3.0 mm) an overall bandwidth (EAB) covering entire C bands, X Ku bands. work introduces novel approach composition regulation presents green synthesis method absorbers high‐performance at loading.

Язык: Английский

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Metal Single‐Atoms Toward Electromagnetic Wave‐Absorbing Materials: Insights and Perspective

Advanced Functional Materials, Год журнала: 2024, Номер 34(44)

Опубликована: Май 22, 2024

Abstract Metal single‐atoms implanted on nitrogen‐doped carbon matrices (M‐N x Cs) can effectively adjust local surface electrons and polarization relaxation through coordination structures to significantly enhance the electromagnetic wave (EMW) absorption properties of materials. However, precise construction geometric electronic metal single atoms discovery structure‐absorption relationship at atomic level confront a huge challenge. Herein, this work summarizes latest progress in single‐atom engineering EMW absorbing materials via comprehensive analysis M‐N Cs terms design principles, modulation strategies, structure‐performance correlations. Subsequently, it highlights recent several typical as materials, aiming achieve complete understanding physical effects atomic‐level mechanisms. Finally, current key challenge future directions are presented by focusing functional This provides new insights for development atomically dispersed efficient response functionalities.

Язык: Английский

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Synergistic dielectric regulation strategy of one-dimensional MoO2/Mo2C/C heterogeneous nanowires for electromagnetic wave absorption

Carbon, Год журнала: 2024, Номер unknown, С. 119877 - 119877

Опубликована: Дек. 1, 2024

Язык: Английский

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Magnetic Bimetallic Heterointerface Nanomissiles with Enhanced Microwave Absorption for Microwave Thermal/Dynamics Therapy of Breast Cancer

ACS Nano, Год журнала: 2024, Номер 18(4), С. 3636 - 3650

Опубликована: Янв. 16, 2024

Microwave thermotherapy (MWT) has shown great potential in cancer treatment due to its deep tissue penetration and minimally invasive nature. However, the poor microwave absorption (MA) properties of thermal sensitizer medical frequency band significantly limit effect MWT then weaken therapeutic efficacy. In this paper, a Ni-based multilayer heterointerface nanomissile MOFs-Ni-Ru@COFs (MNRC) with improved MA performance desired via introducing magnetic loss dielectric is developed for MWT-based treatment. The loading Ni nanoparticle MNRC mediates loss, band. formed by nanoengineering induces significant interfacial polarization, increasing enhancing generated performance. Moreover, strong range not only enhances MW but also facilitates electron energy transfer, generating reactive oxygen species (ROS) at tumor sites mediate dynamic therapy (MDT). strategy strengthening improve MWT-MDT provides direction expanding clinical application

Язык: Английский

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MOF Derivatives with Gradient Structure Anchored on Carbon Foam for High‐Performance Electromagnetic Wave Absorption

Small, Год журнала: 2024, Номер 20(26)

Опубликована: Янв. 20, 2024

The impedance matching and high loss capabilities of composites with homogeneous distribution are limited owing to addition lack structural design. Developing heterogeneous can achieve strong wide electromagnetic (EM) wave absorption. However, challenges such as complex design unclear absorption mechanisms still exist. Herein, a novel composite gradient is successfully constructed via MOF derivatives Co@ nitrogen-doped carbon (Co@NC) anchored on foam (CF) matrix (MDCF). Notably, the concentration easily control structure. In particular, morphologies surface CF undergo transition from collapse inner layer integrity outer layer, accompanied by continuous reduction in size Co nanoparticles. Correspondingly, enhanced interface polarization core-shell Co@NC good MDCF be obtained. optimized exhibits minimum reflection -68.18 dB at 2.01 mm effective bandwidth covering entire X-band. Moreover, lightweight characteristics, excellent compressive strength, low radar cross-section reduction. This work highlights immense potential for achieving high-performance EM

Язык: Английский

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