Optimizing dielectric polarization for electromagnetic wave attenuation <i>via</i> an enhanced Maxwell–Wagner–Sillars effect in hollow carbon microspheres

Wang, Baojun; Wu, Hao; Hou, Wenxuan; Fang, Zhifeng; Liu, Heqin; Huang, Fangzhi; Li, Shikuo; Zhang, Hui

doi:10.1039/d3ta05647c

Cited by 8 publications

(1 citation statement)

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“…The existence of multiple heterogeneous interfaces and interconnected conductive networks in the microspheres efficiently strengthens dielectric loss abilities. Furthermore, Wang et al designed the hollow carbon microspheres with embedded Ni/Ni 2 P heterojunctions through inside-out Ostwald ripening and subsequent phase evolution strategy . The results demonstrate that the improved EMW absorption performances originate from the additional Ni/Ni 2 P heterogeneous interfaces, which significantly contributes to the interfacial polarization relaxation response.…”

Section: Introductionmentioning

confidence: 99%

Embedded Ni/NiO Heterostructure in MoO_3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Zhang,

Wang,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Heterostructure design has been recognized as a promising strategy to reinforce the dielectric polarization response through the strengthened heterogeneous interface interaction. However, the controllable preparation of homogeneously distributed heterostructures in absorbers remains a great challenge. Herein, we proposed a moderate reduction strategy to synthesize a NiO/Ni heterostructure tightly embedded in MoO 3−x nanorods in situ by controlling phase evolution of NiO to metallic Ni under the H 2 /Ar atmosphere. Profiting from the abundant NiO/Ni heterostructures that induced electron migration and redistribution at NiO/Ni interfaces, the NiO/Ni/MoO 3−x absorbers show a strengthened interfacial polarization relaxation response. Enriched oxygen vacancies serve as dipole polarization centers to form independent electric dipole pairs, which are conductive to the enhancement of dipole polarization loss under the alternating electromagnetic filed. Additionally, the homogeneously distributed magnetic Ni species construct a magnetic coupling network and generate ferromagnetic resonance and eddy current loss to boost magnetic loss. Consequently, the resultant absorbers display superior electromagnetic wave absorption performances with a minimum reflection loss value of −64.18 dB and maximum absorption bandwidth up to 6.6 GHz with a thickness of 1.8 mm, effectively covering the whole Ku-band. The radar cross-section (RCS) simulations demonstrate the excellent radar signal suppression capability of NiO/Ni/MoO 3−x absorbers and the maximum RCS reduction value reaching 21.3 dB at 0°. The obtained absorption properties almost surpass most of the reported composites with embedded heterostructures. This work provides a strategy for the preparation of multiple heterogeneous interfaces and presents a deep insight into the attenuation mechanisms of absorbers.

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Section: Introductionmentioning

confidence: 99%

Embedded Ni/NiO Heterostructure in MoO_3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Zhang,

Wang,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Orbital Hybridization Induced Dipole Polarization and Room Temperature Magnetism of Atomic Co‐N₄‐C toward Electromagnetic Energy Attenuation

Wang,

Wei,

Huang

et al. 2024

Adv Funct Materials

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Manipulating the electronic structure and geometric coordination environment of single metal atoms has been considered as promising approach for enhancing dipole polarization and enriching electromagnetic attenuation mechanisms. However, achieving precise control of the dielectric polarization response at atomic scale remains a huge challenge. Herein, a metal‐acetate coordination complexes‐assisted strategy is proposed to prepare spatially isolated cobalt (Co) atoms embedded in accordion‐like nitrogen‐doped carbon (NC) matrix. The interactions between metal atoms and NC matrix are carefully tailored through the successive evolution of dispersion states of Co species, ranging from individual atoms to atomic clusters to nanoparticles. Density functional theory reveals that the orbital hybridization between the d electrons of embedded Co atoms and p electrons of coordinated N atoms induces the electron redistribution at N sites, enabling enhanced electric dipole polarization and robust room temperature magnetism (a saturation magnetization of 0.108 emu g−1 at 300 K). Consequently, Co‐SAs@NC exhibits optimal electromagnetic wave absorption properties with a minimum reflection loss of ‐54.4 dB and an effective absorption bandwidth of 8.4 GHz. This work demonstrates an efficient strategy for modulating electromagnetic response at atomic level and provides a novel insight into the d/p electrons orbital hybridization between single metal atoms and NC species.

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Integrated design of MOFs-derived 0D/1D/2D/3D hierarchical network for high-efficiency electromagnetic wave absorption

Nan,

Fan,

Wang

et al. 2024

Carbon

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Optimizing dielectric polarization for electromagnetic wave attenuation via an enhanced Maxwell–Wagner–Sillars effect in hollow carbon microspheres

Abstract: The rational integration of dielectric components has been a promising approach to optimize the Maxwell-Wagner-Sillars effect (MWSE) for developing lightweight and highly efficient electromagnetic wave (EMW) absorbers. However, the controllable...

Cited by 8 publications

References 66 publications

Embedded Ni/NiO Heterostructure in MoO_3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Embedded Ni/NiO Heterostructure in MoO_3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Orbital Hybridization Induced Dipole Polarization and Room Temperature Magnetism of Atomic Co‐N₄‐C toward Electromagnetic Energy Attenuation

Integrated design of MOFs-derived 0D/1D/2D/3D hierarchical network for high-efficiency electromagnetic wave absorption

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Optimizing dielectric polarization for electromagnetic wave attenuation via an enhanced Maxwell–Wagner–Sillars effect in hollow carbon microspheres

Abstract: The rational integration of dielectric components has been a promising approach to optimize the Maxwell-Wagner-Sillars effect (MWSE) for developing lightweight and highly efficient electromagnetic wave (EMW) absorbers. However, the controllable...

Cited by 8 publications

References 66 publications

Embedded Ni/NiO Heterostructure in MoO3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Embedded Ni/NiO Heterostructure in MoO3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Orbital Hybridization Induced Dipole Polarization and Room Temperature Magnetism of Atomic Co‐N4‐C toward Electromagnetic Energy Attenuation

Integrated design of MOFs-derived 0D/1D/2D/3D hierarchical network for high-efficiency electromagnetic wave absorption

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Product

Resources

About

Embedded Ni/NiO Heterostructure in MoO_3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Embedded Ni/NiO Heterostructure in MoO_3–x Nanorods toward Reinforced Interfacial Polarization for Electromagnetic Wave Absorption

Orbital Hybridization Induced Dipole Polarization and Room Temperature Magnetism of Atomic Co‐N₄‐C toward Electromagnetic Energy Attenuation