Improvement of the Wave-Absorbing Properties of Biomass Derived Porous Carbon Through In-Situ Growth of Sic Nanowires

In this study, a biomass porous carbon material modified by SiC nanowires (GF-SiC) was successfully prepared. The morphological features indicate that SiC nanowires were uniformly encapsulated on the surface of porous carbon materials. GF-SiC with excellent wave absorption properties exhibited a maximum reflection loss of -60.72dB at a thickness of 1.74 mm, and an effective absorption bandwidth (RL≤-10dB) of 5.52 GHz at a thickness of 2.04 mm. The improvement of wave absorption performance was attributed to the three-dimensional porous structure, interfacial polarization and interfaces facilitate impedance matching, resulting in a variety of microwave absorption mechanisms. This work provided a new guideline for the development of low-cost environmental electromagnetic wave absorbing materials.