PB@COF-derived core-shell Fe/Fe3O4/C composites with excellent electromagnetic wave absorption performance for the entire Ku band

被引：1

作者：

Li, Gang ^{[1
]}

Tan, Ruiyang ^{[2
]}

Gao, Bohong ^{[1
]}

Liu, Xinli ^{[1
]}

Zhang, Mingyuan ^{[1
]}

Chen, Ping ^{[2
]}

Wang, Xinyi ^{[1
]}

机构：

[1] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Sch Chem & Chem Engn, State Key Lab Coordinat Chem, Nanjing 210023, Peoples R China

[2] Nanjing Univ, Sch Elect Sci & Engn, Nanjing 210023, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2025年 / 504卷

基金：

中国国家自然科学基金;

关键词：

Core-shell structure; Electromagnetic wave absorption; Dielectric-magnetic synergy; HIGH-EFFICIENCY; LIGHTWEIGHT;

D O I：

10.1016/j.cej.2024.159010

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Developing advanced electromagnetic wave absorption (EMWA) materials is crucial for curbing electromagnetic pollution. This study presents the synthesis of core-shell Fe/Fe3O4/C composites, FFC-700 and FFC-800, derived from Prussian blue@covalent organic framework (PB@COF) via pyrolysis at 700 and 800 degrees C, and the hollow FFC-900 at 900 degrees C. Their chemical compositions, microstructures, and EMWA performances were thoroughly examined. FFC-700 and FFC-800, featuring core-shell structures and abundant interfaces, facilitate electron transfer and enhance polarization effects. Notably, FFC-700 achieved a minimum reflection loss (RLmin) of-75.82 dB at an ultrathin thickness of 1.45 mm, with an effective absorption bandwidth (EAB) of 6.22 GHz at 1.66 mm, spanning the entire Ku-band. FFC-800 also provides substantial EMWA performance, with an RLmin of-30.14 dB at 1.61 mm and an EAB of 6.08 GHz at 1.67 mm, also covering the Ku-band. Radar cross-section (RCS) simulations reveal the absorbers' exceptional radar stealth, with their coatings significantly reducing RCS values. The composites' adjustable structure, balanced composition, and dielectric-magnetic synergy optimize impedance matching for full-Ku-band coverage. This work offers a promising approach to fabricating efficient EMWA materials from PBA@COF and MOF@COF precursors.

引用

页数：13

共 75 条

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