物理化学学报

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磁电协同增强Fe-THBQ/Co3O4@Co复合材料实现宽频吸波

苗鹏1,3, 张昊楠1,3, 张梦瑶1,3, 卢凯旺1,3, 赵卫峰1,3, 陈杰1,3, 马东威4, 陈卫星1,3, 孔杰2   

  1. 1 西安工业大学材料与化工学院，陕西 西安 710021;
    2 西北工业大学化学与化工学院，陕西 西安 710072;
    3 西安工业大学高分子材料光稳技术陕西高校工程研究中心，陕西 西安 710021;
    4 湖北汽车工业学院汽车材料学院，湖北 十堰 442002
  • 收稿日期:2026-05-28 修回日期:2026-08-20 录用日期:2026-08-27
  • 通讯作者: 苗鹏, 孔杰Peng Miao, Jie Kong E-mail:miaopeng@xatu.edu.cn;kongjie@nwpu.edu.cn
  • 基金资助:
    感谢国家自然科学基金(22375156)；陕西省教育厅科学研究计划项目(25JR081/24JR079/24JR080)；国家自然科学基金联合基金(U24A20204)和陕西省自然科学基础研究计划(2025JC-YBMS-606)的资助。

Magnetoelectric coupling in Fe-THBQ/Co3O4@Co composite for broadband microwave absorption

Peng Miao1,3, Haonan Zhang1,3, Mengyao Zhang1,3, Kaiwang Lu1,3, Weifeng Zhao1,3, Jie Chen1,3, Dongwei Ma4, Weixing Chen1,3, Jie Kong2   

  1. 1 School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, Shaanxi Province, China;
    2 School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, Shaanxi Province, China;
    3 Engineering Research Center of Light Stabilizers for Polymer Materials, Universities of Shaanxi Province, Xi’an 710021, Shaanxi Province, China;
    4 School of Automotive Materials, Hubei University of Automotive Technology, Shiyan 442002, Hubei Province, China
  • Received:2026-05-28 Revised:2026-08-20 Accepted:2026-08-27

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摘要： 金属有机框架(MOF)材料大多为绝缘体，通常表现出较弱的微波吸收性能。MOF在高温热解过程中结构容易坍塌，这限制了其在宽带微波吸收下结构与性能的稳定。而在电子层面非热解型导电MOF其介电损耗与磁损耗协同机制尚不清晰。基于此，本文合成了电导率为9.17 × 10−5 S cm−1的三维(3D)导电Fe-THBQ。采用密度泛函理论(DFT)计算阐明了在电子结构层面界面载流子的传输路径，证实载流子迁移路径主要发生在Fe-THBQ的Fe–O键，并揭示了3D导电Fe-THBQ以电阻损耗为主。在此基础上，将片状Co3O4@Co磁性颗粒与导电Fe-THBQ复合制备了Fe-THBQ/Co3O4@Co复合材料，实现了磁损耗与电阻损耗间的高效耦合。在2.0 mm处Fe-THBQ/Co3O4@Co的有效吸收带宽(EAB)为5.6 GHz，在2.4 mm处最小反射损耗(RLmin)为−42.65 dB。微波吸收机理表明，片状磁性Co3O4@Co主要贡献为涡流损耗和极化效应，而导电Fe-THBQ与磁性Co3O4@Co间大量的异质界面能够诱发多重散射、磁电耦合与界面极化作用。本文可为高性能非热解导电MOF基宽带微波吸收材料的制备提供新材料与理论支撑。

关键词: 导电Fe-THBQ, 磁电耦合, 微波吸收, 导电损耗, 极化损耗

Abstract: Metal-organic frameworks (MOFs) are mostly and intrinsically insulating and typically exhibit weak microwave absorption capacity. Moreover, their frameworks tend to collapse during pyrolysis, which severely limits their stability of the structure and performance in broadband microwave absorption. Meanwhile, the synergistic mechanism between resistance loss and magnetic loss in non-pyrolyzed conductive MOFs remains insufficiently understood at the electronic level. To address these challenges, three-dimensional (3D) conductive Fe-THBQ with an electrical conductivity of 9.17 × 10−5 S cm−1 was rationally synthesized. Density functional theory (DFT) calculations were employed to elucidate the transmission path of interfacial carriers at the electronic structure level, revealing that carrier transfer is primarily concentrated at the Fe-O bonds of Fe-THBQ and clarifying the microscopic origin of the intrinsic dielectric response in 3D conductive Fe-THBQ. On this basis, flake-like Co3O4@Co was introduced into the non-pyrolyzed Fe-THBQ to construct Fe-THBQ/Co3O4@Co composites, enabling effective magnetoelectric coupling between magnetic loss and resistance loss. The as-prepared Fe-THBQ/Co3O4@Co composites exhibit an effective absorption bandwidth (EAB) of 5.6 GHz at a thickness of 2.0 mm and a minimum reflection loss (RLmin) of −42.65 dB at 2.4 mm. Microwave absorption mechanism demonstrates that the flake-like and magnetic Co3O4@Co components contribute significant eddy current loss and polarization effects, while the abundant heterogeneous interfaces between the conductive Fe-THBQ and magnetic Co3O4@Co facilitate multiple scattering, magnetoelectric coupling, and interfacial polarization. Overall, this work provides a novel strategy and solid theoretical foundation for the rational design of high-performance, non-pyrolyzed conductive MOF-based broadband microwave absorbers.

Key words: Conductive Fe-THBQ, Magnetoelectric coupling, Microwave absorption, Conductive loss, Polarization loss