Amorphous Carbon\nRegulates Defects to Achieve TaC\nNanowires with Enhanced Microwave Absorption

Abstract

Carbon/carbon composite materials, as electromagnetic\nwave-absorbing\n(EWA) materials, have been widely studied due to their excellent impedance\nmatching and high dielectric loss. In this work, we introduced amorphous\ncarbon into the TaC nanowire (TaC_nws) matrix, effectively\noptimizing impedance matching. The inclusion of amorphous carbon introduces\na substantial quantity of imperfections and interfaces, thereby promoting\npolarization. The multipolarization loss and magnetic loss mechanism\ngenerate electromagnetic synergistic loss effects, significantly improving\nthe attenuation performance of EW. The TaC_nws/C sample\nexhibits exceptional EWA performance, achieving a minimum reflection\nloss (RL_min) of −54.25 dB and an effective absorption\nbandwidth (EAB) of 3.6 GHz at a low thickness of merely 1.4 mm. This\nstudy presents a novel methodology for the future fabrication of TMC\ncomposite materials, thereby holding substantial research implications.