Carbon nanotubes (CNTs), characterized by their low density, high specific surface area, and excellent electrical conductivity, hold significant promise for applications in electromagnetic protection. In this study, to effectively address the challenge of interfacial impedance mismatching, we developed a rapid and efficient arc discharge plasma method for the in situ synthesis of CNTs on a silver (Ag) matrix, resulting in Ag@CNT nanocomposites. The microstructure, morphology, and surface chemical composition of the as‐prepared nanocomposites were characterized in detail. The nanocomposites exhibited dielectric loss and weak ferromagnetism, attributed to the reduced crystallinity, broken bonds, and abundant defects introduced at the CNTs and Ag–C interfaces. These features significantly enhanced impedance matching with incident electromagnetic waves. Electromagnetic wave absorption performance was evaluated for paraffin‐based composites containing 30 wt% Ag@CNTs. The material achieved a minimum reflection loss (RL) of −39.8 dB at 13.8 GHz, with an effective absorption bandwidth (RL below −10 dB) spanning from 11.7 to 15.7 GHz at a matching thickness of just 1.6 mm.
Wang et al. (2026) studied this question.