Flexible Mo2C‐Modified SiC/C Nanofibers for BroadBand Electromagnetic Wave Absorption

Abstract

AbstractMaterials with 1D structure exhibit a remarkable advantage for losing electromagnetic (EM) wave energy. Herein, flexible Mo2C‐modified SiC/C nanofibers (Mo‐SiC/C NFs) are synthesized for the first time by co‐electrospinning and subsequent high‐temperature pyrolysis, using polycarbosilane (PCS) and molybdenum acetyl acetone (MoO2(acac)2) as precursors. It is found that the polymer derived temperature of PCS is significantly decreased by introducing MoO2(acac)2, as well as endowing the SiC/C NFs with good flexibility, high crystallinity, and remarkable microwave absorption performance. The as‐prepared fibers dispersed in paraffin with a low filler loading (15 wt%) exhibit a minimum reflection loss (RL, dB) of ‐62.5 dB, and a wide effective absorption bandwidth (EAB, RL<‐10 dB) of 6.8 GHz at 2.75 mm. Meanwhile, the EAB of the hybrid can cover the whole X‐band and most of the C‐band by modulating its thickness. These high‐efficient performances mainly originate from the specific 1D microstructure, abundant interfaces and defects, and synergistic effect among SiC, Mo2C, and C matrix. Thus, this work offers a way to explore flexible SiC/C NFs as a promising candidate with lightweight and wide EAB for EM wave absorption.