Carbonized Kevlar Nanofiber/Carbon Nanotube/Magnetic Nanoparticle Hybrid Aerogel Fibers for Microwave Absorption

Traditional passive jamming media always suffer from high density and impedance mismatch, which have restricted them from being directly utilized as microwave absorbing materials. Herein, carbonized Kevlar nanofiber/carbon nanotube/magnetic nanoparticle (CKNF/CNT/MNP) hybrid aerogel fibers with low apparent density (0.12 g/cm3) and adjustable electromagnetic parameters are fabricated for microwave absorption. The minimum reflection loss (RLmin) of the aerogel fibers reaches −59 dB at 14.8 GHz, and the effective absorption bandwidth (EAB) reaches the whole Ku-band with 1.8 mm thickness. In addition, the aerogel fibers can be further developed into microwave absorptive smoke, which exhibits a wide microwave absorption frequency (5.5–15.5 GHz).