Broadband multispectral compatible absorbers for radar, infrared and visible stealth application

Progress in Materials Science, Год журнала: 2023, Номер 135, С. 101088 - 101088

Опубликована: Фев. 4, 2023

Язык: Английский

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High‐Entropy Enhanced Microwave Attenuation in Titanate Perovskites

Advanced Materials, Год журнала: 2023, Номер 35(11)

Опубликована: Янв. 6, 2023

High-entropy oxides (HEOs), which incorporate multiple-principal cations into single-phase crystals and interact with diverse metal ions, extend the border for available compositions unprecedented properties. Herein, a high-entropy-stabilized (Ca0.2 Sr0.2 Ba0.2 La0.2 Pb0.2 )TiO3 perovskite is reported, effective absorption bandwidth (90% absorption) improves almost two times than that of BaTiO3 . The results demonstrate regulation entropy configuration can yield significant grain boundaries, oxygen defects, an ultradense distorted lattice. These characteristics give rise to strong interfacial defect-induced polarizations, thus synergistically contributing dielectric attenuation performance. Moreover, large strains derived from lattice distortions in high-entropy offer varied transport electron carriers. high-entropy-enhanced positive/negative charges accumulation around boundaries strain-concentrated location, quantitatively validated by holography, unusual polarization loss. This study opens up avenue designing microwave materials satisfy increasingly demanding requirements advanced integrated electronics. work also offers paradigm improving other interesting properties HEOs through engineering.

Язык: Английский

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One-Dimensional Magnetic FeCoNi Alloy Toward Low-Frequency Electromagnetic Wave Absorption

Nano-Micro Letters, Год журнала: 2022, Номер 14(1)

Опубликована: Авг. 20, 2022

Rational designing of one-dimensional (1D) magnetic alloy to facilitate electromagnetic (EM) wave attenuation capability in low-frequency (2-6 GHz) microwave absorption field is highly desired but remains a significant challenge. In this study, composite EM absorber made FeCoNi medium-entropy embedded 1D carbon matrix framework rationally designed through an improved electrospinning method. The 1D-shaped demonstrates the high-density and continuous network using off-axis electronic holography technique, indicating excellent loss ability under external field. Then, in-depth analysis shows that many factors, including anisotropy intrinsic physical features alloy, primarily contribute enhanced performance. Therefore, fabricated increasing effective band 1.3 GHz at ultrathin thickness 2 mm. Thus, study opens up new method for design preparation high-performance absorbers.

Язык: Английский

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Confined Diffusion Strategy for Customizing Magnetic Coupling Spaces to Enhance Low‐frequency Electromagnetic Wave Absorption

Advanced Functional Materials, Год журнала: 2023, Номер 33(16)

Опубликована: Фев. 7, 2023

Abstract The rational design of magnetic composites has great potential for electromagnetic (EM) absorption, particularly in the low‐frequency range 2–8 GHz. However, scalable synthesis such absorbers with both high content and good dispersity remains challenging. In this study, a confined diffusion strategy is proposed to fabricate functional magnetic‐carbon hollow microspheres. Driven by ferromagnetic enhanced Kirkendall effect, situ alloying FeCo nanoparticles tightly carbon shells, effectively inhibiting agglomeration. Moreover, core–shell FeCo–carbon nano‐units further assemble into dispersive microscale Janus bulges on inner outer surfaces microsphere. optimized FeCo@C microspheres exhibit excellent EM wave absorption performance: minimum reflection loss ( RL min ) −35.9 dB, bandwidth covers almost entire C‐band. Systematic investigation reveals that large size integration, high–density units, strong coupling are essential enhancing dissipation waves. This study provides novel fabricating advanced significant inspiration investigating attenuation mechanism at low frequency.

Язык: Английский

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New generation electromagnetic materials: harvesting instead of dissipation solo

Science Bulletin, Год журнала: 2022, Номер 67(14), С. 1413 - 1415

Опубликована: Июнь 21, 2022

Язык: Английский

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2D MXene Nanomaterials: Synthesis, Mechanism, and Multifunctional Applications in Microwave Absorption

Small Structures, Год журнала: 2022, Номер 3(10)

Опубликована: Июль 16, 2022

MXene nanomaterials stand out among 2D and have been extensively studied by researchers because of their unique layered structure, chemical diversity, outstanding physical properties. In recent years, materials rapidly opened the market for electromagnetic interference shielding technology due to excellent wave absorption (EMA) capability. However, so far, compared with development (EM) technology, there is still much room in construction MXenes application absorption. Herein, strategies, conversion mechanism, applications are reviewed. Through meticulous material design an interdisciplinary approach, expected become one smart tunable absorbers, scenarios will also broader.

Язык: Английский

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Staggered circular nanoporous graphene converts electromagnetic waves into electricity

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Апрель 8, 2023

Harvesting largely ignored and wasted electromagnetic (EM) energy released by electronic devices converting it into direct current (DC) electricity is an attractive strategy not only to reduce EM pollution but also address the ever-increasing crisis. Here we report synthesis of nanoparticle-templated graphene with monodisperse staggered circular nanopores enabling EM-heat-DC conversion pathway. We experimentally theoretically demonstrate that this nanoporous structure alters graphene's phononic properties synergistically manipulating its intralayer nanostructures interlayer interactions. The exhibits anomalous combination properties, which lead efficient absorption waves heat in turn output DC through thermoelectric effect. Overall, our results advance fundamental understanding structure-property relationships ordered graphene, providing effective generate electric energy.

Язык: Английский

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A Systematic Review of Advanced Sensor Technologies for Non-Destructive Testing and Structural Health Monitoring

Sensors, Год журнала: 2023, Номер 23(4), С. 2204 - 2204

Опубликована: Фев. 15, 2023

This paper reviews recent advances in sensor technologies for non-destructive testing (NDT) and structural health monitoring (SHM) of civil structures. The article is motivated by the rapid developments data analytics leading to ever-advancing systems assessing Conventional advanced are systematically reviewed evaluated context providing input parameters NDT SHM their suitability determine state presented sensing selected based on capabilities, reliability, maturity, affordability, popularity, ease use, resilience, innovation. A significant focus placed evaluating associated analytics, highlighting limitations, advantages, disadvantages. presents techniques such as fiber optics, laser vibrometry, acoustic emission, ultrasonics, thermography, drones, microelectromechanical (MEMS), magnetostrictive sensors, next-generation technologies.

Язык: Английский

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Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Small, Год журнала: 2022, Номер 19(6)

Опубликована: Ноя. 27, 2022

In order to achieve excellent electromagnetic wave (EMW) absorption properties, the microstructure design and component control of absorber are critical. this study, three different structures made Mo2 C/C hollow spheres prepared their microwave behavior is investigated. The double-shell consisting an outer thin shell inner rough thick with multiple EMW loss mechanisms exhibit good properties. further improve MoC1-x /C crystalline phases molybdenum carbide optimize capability materials. Finally, α-phase have best When filling 20 wt.%, minimum reflection at 1.8 mm -50.55 dB effective bandwidth 2 5.36 GHz, which expected be a characteristics "thin, light, wide, strong".

Язык: Английский

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Remarkable Magnetic Exchange Coupling via Constructing Bi‐Magnetic Interface for Broadband Lower‐Frequency Microwave Absorption

Advanced Functional Materials, Год журнала: 2022, Номер 32(33)

Опубликована: Июнь 8, 2022

Abstract Severe lower‐frequency (2–8 GHz) microwave pollution caused by the rapid development of 5th generation (5G) communication posts significance on cutting‐edge absorbers. However, intensely coupled wave‐impedance and dissipating ability dramatically hinder their performance in exact range. The rationally designed heterostructure hard/soft ferrite composite provides an efficient solution to address issue. In this context, core‐shell structured BaFe (12‐x) Co x O 19 @Fe 3 4 with abundant heterointerface is created using facile spray‐drying subsequent solvothermal approach, where hard magnetic serves as core soft Fe shell, respectively. unique integration contributes sufficient exchange coupling interaction for strong loss beyond Snoek's limitation, which considerably boosts a absorption. Accordingly, minimum reflection (RL min ) typical 11.6 0.4 microcomposite reaches − 48.9 dB at thickness 3.5 mm, its bandwidth < 10 can cover almost all S C bands (2.6–8 GHz). Generally, easy controllable pathway conveyed work encourage improved well decouple composites, widens road advanced

Язык: Английский

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