Ni Nanoparticle-Ti₃C₂T_x/PI composites with multiple wave absorption mechanisms

Ti₃C₂T_x MXene, a novel two-dimensional nanomaterial with high electrical conductivity and low density, shows great potential for high-performance microwave absorption but suffers from poor impedance matching due to its high dielectric constant. This study addresses this issue by mixing Ti₃C₂T_x with magnetic Ni nanoparticles and incorporating them into a polyimide (PI) matrix to form a composite. The composite's structure and wave absorption properties were analyzed, revealing optimal performance at 7.5 wt% wave absorbent content. It achieved a minimum reflection loss (RL_min) of −51.26 dB at 17.11 GHz with a thickness of 1.2 mm and a maximum effective absorption bandwidth (EAB) of 5.19 GHz at 1.1 mm. This approach offers an effective strategy for developing composite materials with enhanced microwave absorption capabilities.