To improve the microwave absorption (MA) performance of SiC nanofibers, dual interfaces were designed on the surfaces of SiC nanofibers to form SiC@C@PPy heterostructures. The inner carbon and outer polypyrrole (PPy) layers were synthesized through gas etching and oxidative polymerization, respectively. Benefitting from polarization enhancement in dual interfaces and the well-established conductive networks in the composite, SiC@C@PPy nanofiber-loaded composites reveal ideal electromagnetic attenuation and impedance matching properties. The best effective absorption bandwidth (EAB) of SiC@C@PPy nanofibers can reach 8.4 GHz at a thickness of 2.78 mm with a filler loading of 15 wt %. Moreover, by modulating the thickness of the samples, the EAB can cover the whole X (8–12 GHz) and Ku (12–18 GHz) bands.

中文翻译：

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双界面极化增强设计可调谐的SiC @ C @ PPy微波吸收纳米纤维。

为了提高SiC纳米纤维的微波吸收（MA）性能，在SiC纳米纤维的表面设计了双界面以形成SiC @ C @ PPy异质结构。内层碳和外层聚吡咯（PPy）分别通过气体蚀刻和氧化聚合合成。受益于双界面的极化增强和复合材料中完善的导电网络，SiC @ C @ PPy纳米纤维负载复合材料显示出理想的电磁衰减和阻抗匹配特性。SiC @ C @ PPy纳米纤维的最佳有效吸收带宽（EAB）在2.78 mm的厚度下可达到8.4 GHz，填充剂含量为15 wt％。此外，通过调制样本的厚度，EAB可以覆盖整个X（8-12 GHz）和Ku（12-18 GHz）频段。