Abstract Light-weight and flexible microwave absorbers are in increasing demand because of the electromagnetic (EM) pollution. Carbon fiber mats are promising as they have high flexibility and conductivity. However, the high permittivity of the carbon fibers leads to a strong impedance mismatch with free space. Thus, SiC was introduced to carbon fibers as it has an outstanding impedance match with free space. After the decoration of SiC nanoparticles, incident microwaves could penetrate into the SiC decorated carbon (C–SiC) nanofiber mats and be converted into internal energy instead of being reflected. Conductive loss and polarization relaxation loss from the SiC nanoparticles and conductive carbon nanofiber matrix consumed the EM energy. Additionally, the highly flexible carbon fiber matrix could bear the load of bending and twisting, leading to excellent flexibility and reliability. The C–SiC nanofiber mats exhibited a resistance change less than 20% after 200 times bending, and had excellent EM absorbing properties with the RLmin of −53.7 dB at the thickness of 2.15 mm and the effective bandwidth of 7.11 GHz at the thickness of 2.6 mm. The proposed strategy may facilitate the design of highly reliable and flexible carbon based two dimensional (2D) EM absorbers for the broadband wave absorbing.

中文翻译：

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用于宽带微波吸收的超轻柔性碳化硅纳米颗粒装饰碳纳米纤维垫

摘要 由于电磁 (EM) 污染，对重量轻且灵活的微波吸收器的需求不断增加。碳纤维垫具有高柔韧性和导电性，因此很有前途。然而，碳纤维的高介电常数导致与自由空间的强烈阻抗失配。因此，碳化硅被引入碳纤维，因为它与自由空间具有出色的阻抗匹配。在碳化硅纳米粒子装饰后，入射微波可以穿透碳化硅装饰的碳（C-SiC）纳米纤维垫并转化为内能而不是被反射。来自碳化硅纳米颗粒和导电碳纳米纤维基体的导电损耗和极化弛豫损耗消耗了电磁能量。此外，高柔韧的碳纤维基体可以承受弯曲和扭曲的载荷，导致出色的灵活性和可靠性。C-SiC 纳米纤维垫在弯曲 200 次后表现出小于 20% 的电阻变化，并且具有优异的电磁吸收性能，厚度为 2.15 mm 时的 RLmin 为 -53.7 dB，厚度为 2.6 时的有效带宽为 7.11 GHz毫米。所提出的策略可以促进用于宽带波吸收的高度可靠和灵活的碳基二维（2D）EM吸收器的设计。