2026-10-11T03:53:51Z https://www.scidb.cn/oai

10.57760/sciencedb.j00125.00171 2026-05-28T17:00:44Z

2026-05-28 Fabrication of CoFe/C@polypyrrole composites with efficient electromagnetic wave absorption properties doi:10.57760/sciencedb.j00125.00171 en Recently, increasingly severe electromagnetic radiation has caused harm to precision equipment and human health. Therefore, the development of effective electromagnetic wave (EMW) absorption materials is urgent. However, EMW absorption materials face the challenge of simultaneously achieving strong absorption and a broad bandwidth at low filling rates and small thicknesses. To address this, we strategically constructed a hierarchical cobalt–iron/carbon@polypyrrole (CoFe/C@PPy) heterostructure via a two-step synthesis process: initial fabrication of magnetic CoFe/C fibers followed by in situ coating with a tunable PPy layer. This component integration results in loss mechanisms in which magnetic loss from CoFe/C and dielectric loss from PPy enhance impedance matching and EMW dissipation. The optimized composite (CFC-2) demonstrates exceptional performance: at a thickness of 2.0 mm and a 10% filler loading, it reaches an RLmin of −45.6 dB at 14.64 GHz, and the corresponding effective absorption bandwidth is 5.12 GHz. Furthermore, CST Studio simulations and far-field radar cross-section (RCS) analysis validate its practical utility, showing a notable RCS reduction of up to 37.5 dBm² compared with a perfect electric conductor. This study presents a high-performance absorber and provides a viable design strategy for efficient electromagnetic protection materials through multicomponent synergy. It also provides a foundation for developing efficient EMW absorption materials. Electromagnetic wave absorption; Conductive loss; Interface polarization; CoFe alloy; Structural design Wang Yongzhen Qu Lin RESTRICTED dataset Science Data Bank