Hierarchical Engineering on Built‐In Electric Field of Bimetallic Zeolitic Imidazolate Derivatives Towards Amplified Dielectric Loss

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract Construction of built‐in electric field (BIEF) in nanohybrids has been demonstrated as an efficacious strategy to boost the dielectric loss by facilitating oriented transfer and transition charges, thus optimizing electromagnetic wave absorption property. However, specific influence BIEF on interface polarization needs explore thoroughly strength should be further augmented. Herein, several systems incorporated Mott–Schottky heterojunctions hollow structures are designed constructed, where bimetallic zeolitic imidazolate framework employed derive Cu‐ZnO heterojunctions, hierarchical enriched introducing structure reduced graphene oxide. The well‐established “double” verified theoretical calculation engineering can regulate conductivity, enhance relaxation effectively. Especially, there always coexisted both enhanced charge separation reversed distribution this BIEF, boosting polarization. Attributing synergy well‐matched impedance amplified loss, obtained hybrids exhibited superior (reflection −46.29 dB ultra‐wide effective bandwidth 7.6 GHz at only 1.6 mm). This work proves innovative model for dissecting mechanisms pioneers a novel advanced absorbers through enhancing BIEF.

Language: Английский

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Frequency insensitive electromagnetic absorption core-shell sandwich structure with excellent electromagnetic damage tolerance

Composites Part B Engineering, Journal Year: 2024, Volume and Issue: 289, P. 111946 - 111946

Published: Nov. 5, 2024

Language: Английский

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Electron Migratory Polarization of Interfacial Electric Fields Facilitates Efficient Microwave Absorption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract High‐performance microwave absorption materials (MAM) are often accompanied by synergistic effects of multiple loss mechanisms, but the contribution share various mechanisms has been neglected to provide a template and reference for design MAM. Here, highly conductive 2D structure is designed through functional group‐induced modulation strategy, composite L‐Ni@C can reach an effective bandwidth 6.45 GHz at 15% fill rate, with maximum efficiency 99.9999%. Through layer‐by‐layer analysis mechanism, it found that strong originates from polarization heterogeneous interface. The movement space charge between two‐phase interface forms interfacial electric field, in situ doping nitrogen cleverly achieved introduction amino groups, which significantly enhances rate transfer greatly facilitates electron migration polarization. motion law field also simulated using COMSOL simulation software illustrate mechanism interfaces. This work fills gap structural presents new theories into

Language: Английский

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Differentiated electromagnetic wave absorption enabled by load modulation of cross-dimensional SiC nanostructures

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161364 - 161364

Published: March 1, 2025

Language: Английский

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In situ growth of the Y₃Si₂C₂ interphase in SiC_f‐reinforced mullite ceramics for enhanced electromagnetic wave absorption

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

Abstract To meet the rigorous demands placed on electromagnetic (EM) wave absorbing (EWA) materials by harsh service conditions and to reduce EM power density, development of ceramic‐based EWA with high reliability stability has become a subject significant focus. In this study, yttrium silicide carbide interphase was in situ synthesized silicon fibers fabricate Y₃Si₂C₂–SiC f composite molten salt method. These were then incorporated into mullite ceramic matrix, /mullite composites prepared gel injection molding, aiming at enhancing properties. The exhibited reflection loss −28.97 dB 2.44 mm thickness an effective absorption bandwidth 3.066 GHz, outperforming pure SiC due addition . A modified Drude–Lorentz model developed capture multi‐peak permittivity behavior composites. results showed that dipole relaxation hopping migration localized electrons played key roles overall microwave energy attenuation, which closely matched experimental data. Furthermore, simulations electric field distribution radar cross‐section confirmed superior capability practical application potential This study offers valuable theoretical insights design ‐reinforced materials.

Language: Английский

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The polarization loss induced by interfacial charge redistribution using Ar plasma treatment in Ni@C composites for superior microwave absorption performance

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160489 - 160489

Published: Feb. 1, 2025

Language: Английский

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Honeycomb structure SiCf/Si3N4 composite with broadband electromagnetic absorption performance under a wide temperature range

Journal of the European Ceramic Society, Journal Year: 2025, Volume and Issue: unknown, P. 117205 - 117205

Published: Jan. 1, 2025

Language: Английский

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Modifying the CNTs with high dielectric loss NiCo2O4 to enhance the electromagnetic wave absorption properties

Ceramics International, Journal Year: 2024, Volume and Issue: 50(21), P. 41189 - 41195

Published: July 30, 2024

Language: Английский

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Multicomponent competitive synergistically active NiFe2O4/C-g-C3N4/RGO heterostructure for efficient electromagnetic wave absorption

Carbon, Journal Year: 2024, Volume and Issue: unknown, P. 119964 - 119964

Published: Dec. 1, 2024

Language: Английский

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Excellent C-band microwave absorption properties of Ni@nitrogen-doped porous carbon nanocomposite via polymer bubbling technique

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1009, P. 176929 - 176929

Published: Oct. 9, 2024

Language: Английский

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