Amorphous Carbon Regulates Defects to Achieve Tacnws/C with Enhanced Microwave Absorption

Abstract

Carbon/carbon composite materials, as a electromagnetic wave absorbing (EWA) material, have been widely studied due to their excellent impedance matching and high dielectric loss. In this work, we introduced amorphous carbon into the TaC nanowire (TaCnws) matrix, effectively optimizing impedance matching. The presence of amorphous carbon brings about a large number of defects and interfaces, which promotes polarization loss. The multi-polarization loss and magnetic loss mechanism generate electromagnetic synergistic loss effects, significantly improving the attenuation performance of EW. The sample TaCnws/C exhibits excellent EWA performance with a minimum reflection loss (RLmin) of -54.25 dB and the effective absorption bandwidth (EAB) of 3.6 GHz at a low thickness of 1.4 mm. This work provides a new approach for the preparation of TMC composite materials in the future and has certain research significance.

Keywords: one-dimensional, microwave absorption, dielectric property, TaC nanowires