文献类型：期刊文献

英文题名：Sulfur vacancy rich carbon/FeS/Fe3O4 composite with synergistic dielectric-magnetic loss for enhanced microwave absorption

作者：Wang, Xueyang[1,2];Yao, Jiaxin[1];Luo, Yi[2];Niu, Bo[1,2];Su, Zhe[2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tech, Shanghai 200237, Peoples R China;[2]Suzhou Lab, Struct Mat Res Dept, Suzhou 215000, Peoples R China

年份：2026

卷号：260

外文期刊名：CARBON

收录：;EI(收录号：20263221254948);Scopus(收录号：2-s2.0-105046475089);WOS:【SCI-EXPANDED(收录号:WOS:001843821400001)】；

基金：This work was supported by National Natural Science Foundation of China (U2341291 and 52472095) .

语种：英文

外文关键词：Electromagnetic wave absorption; Transition metal sulfides; Sulfur vacancy; Dielectric and magnetic loss

摘要：Transition metal sulfide (TMS)-based composites have shown great promise for microwave absorption, yet achieving high attenuation and broadband absorption simultaneously remains a critical challenge. Herein, ion-exchange resin is innovatively employed as a dual source of sulfur and carbon to prepare a magnetic C/FeS/ Fe3O4 composite rich in sulfur vacancies, which achieves synergistic dielectric-magnetic dissipation for efficient electromagnetic wave (EMW) absorption. The preparation involves a simple process of ion exchange, physical adsorption and carbonization, during which FeS and Fe3O4 are generated in situ on the resin-derived porous carbon skeleton. The abundant sulfur vacancies, heterogeneous interfaces, and three-dimensional conductive network synergistically enhance dipole polarization, interfacial polarization and conductive loss. Moreover, the ferromagnetic Fe3O4 component contributes to magnetic loss. These synergistic dielectric-magnetic loss mechanisms endow C/FeS/Fe3O4 composite with both excellent attenuation capacity and favorable impedance matching. Consequently, the composite delivers outstanding EMW absorption performance, exhibiting a minimum reflection loss (RLmin) of-69.2 dB at a thickness of 1.65 mm and an effective absorption bandwidth (EAB) of 5.1 GHz at 1.50 mm. Radar cross-section (RCS) simulations demonstrate that C/FeS/Fe3O4 can significantly suppress radar-wave scattering, achieving a maximum RCS reduction of 28.0 dB m2. Furthermore, the composite shows excellent application potential when incorporated into a flexible, heat-dissipating, microwave-absorbing C/FeS/Fe3O4-silicone rubber plate. This work provides valuable insights into the rational design and fabrication of high-performance TMS-based EMW absorbers.