Simultaneous manipulation of constituent and structure toward MOFs-derived hollow Co3O4/Co/NC@MXene microspheres via pyrolysis strategy for high-performance microwave absorption

Xing, Linlong; Cheng, Haoran; Li, Yang; Chen, Qiang; Liu, Xianhu

doi:10.1016/j.cej.2024.150729

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.150729

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Simultaneous manipulation of constituent and structure toward MOFs-derived hollow Co3O4/Co/NC@MXene microspheres via pyrolysis strategy for high-performance microwave absorption

Linlong Xing,

Haoran Cheng,

Yang Li

et al.

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Cited by 18 publications

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The Influence of Filler Shape on the Microwave Absorptions of Polyethylene Composites with High Ferroalloy Powder Content

Li,

Cheng

et al. 2024

Adv Eng Mater

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The ferroalloy powder (FeP) with remarkably high‐magnetic permeability and high‐temperature stability has attracted much attention for its potential application in the field of radar stealth. However, achieving high stealth performance in different frequency bands by controlling the shape of iron alloys remains a major challenge. Herein, FeP‐filled high‐density polyethylene composites with different FeP shapes by hot pressing are prepared. This work employs a straightforward vacuum hot‐pressing molding technique to analyze the electromagnetic wave absorption property of composite materials utilizing two distinct forms of FeP as different fillers. It is noted that composites filled with 75 wt% spherical FeP with excellent impedance matching exhibit a minimum reflection loss (RLmin) of −60.75 dB at 12.23 GHz with a thickness of 2.55 mm, and a maximum effective absorption bandwidth of 8.31 GHz at 2.5 mm. While high‐density polyethylene composites filled with 75 wt% flaky FeP obtain the RLmin value at a low frequency of 2 GHz because of the high magnetic loss. This work provides a guideline for developing applications of FeP‐filled composites with different shapes.

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The Influence of Filler Shape on the Microwave Absorptions of Polyethylene Composites with High Ferroalloy Powder Content

Li,

Cheng

et al. 2024

Adv Eng 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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Dimensional Self‐Assembled Magnetic Coupling via Embedding Ferromagnetic Nanoparticles in Multi‐Channel Fibers for Microwave Absorption

Wang,

Lv,

Zhang

et al. 2024

Adv Funct Materials

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Abstract1D magnetic fibers with significant morphological diversity and magnetic anisotropy are highly desirable for optimizing magnetic properties and electromagnetic responsiveness. However, it remains challenging for the precise control over internal magnetic interactions within each fiber. Herein, a strategy for self‐assembled magnetic coupling is taken to achieve the controllable reconstruction of continuous multiple coupling networks within a single fiber. High‐density ultrafine cobalt nanoparticles are uniformly embedded inside a carbon framework with a 1D multi‐channel structure (Co@MCF). This structure establishes a complex magnetic response system characterized by inherent inter‐fiber interactions and refined intra‐fiber self‐assembling coupling. The distinctive distribution of magnetic flux lines demonstrates enhanced magnetic sensitivity. This results in a minimum reflection loss of −57.65 dB and a broadband absorption frequency range of 7.28 GHz at 1.9 mm, effectively covers the entire Ku band and a substantial portion of the X band. The multi‐channel structure enhances the understanding of the relationship between microstructure and performance in magnetic fibers. Additionally, it positions Co@MCF as a highly competitive candidate for microwave absorption applications.

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Simultaneous manipulation of constituent and structure toward MOFs-derived hollow Co3O4/Co/NC@MXene microspheres via pyrolysis strategy for high-performance microwave absorption

Cited by 18 publications

References 53 publications

The Influence of Filler Shape on the Microwave Absorptions of Polyethylene Composites with High Ferroalloy Powder Content

The Influence of Filler Shape on the Microwave Absorptions of Polyethylene Composites with High Ferroalloy Powder Content

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

Dimensional Self‐Assembled Magnetic Coupling via Embedding Ferromagnetic Nanoparticles in Multi‐Channel Fibers for Microwave Absorption

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Resources

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Simultaneous manipulation of constituent and structure toward MOFs-derived hollow Co3O4/Co/NC@MXene microspheres via pyrolysis strategy for high-performance microwave absorption

Cited by 18 publications

References 53 publications

The Influence of Filler Shape on the Microwave Absorptions of Polyethylene Composites with High Ferroalloy Powder Content

The Influence of Filler Shape on the Microwave Absorptions of Polyethylene Composites with High Ferroalloy Powder Content

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

Dimensional Self‐Assembled Magnetic Coupling via Embedding Ferromagnetic Nanoparticles in Multi‐Channel Fibers for Microwave Absorption

Contact Info

Product

Resources

About

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