A PEEK Composite Paper Maintaining High Electromagnetic Shielding Properties Under a Wide Temperature Region and Cyclic Near Infrared High Power Laser Irradiation

Lightweight, environmentally resistant electromagnetic shielding materials are critical for aerospace and military applications. Constructing multi-layer conductive network structure offers an effective pathway to achieve high-performance electromagnetic interference (EMI) shielding. In this work, we developed a lightweight fiber-reinforced composite paper that delivered ultra-high EMI shielding performance (SE) even under harsh conditions. A three-dimensional conductive network was formed by the controlled incorporation of Cu@PEEK fibers and carbon fibers (CFs) into a carbon nanotubes (CNTs)/PEEK fiber matrix. Experimental results revealed remarkable synergistic effects among the multi-scale fibers, endowing the composite paper with an exceptional EMI shielding effectiveness of 54.4 dB at an ultra-thin thickness of 0.3 mm (12 GHz). Furthermore, the stability of the EMI shielding performance was evaluated under extreme temperatures and near-infrared high-power laser irradiation. The composite paper retains over 80% of its shielding effectiveness, demonstrating the potential for application in complex environments. This work provides valuable insights for designing high-stability EMI shielding materials suited for extreme operational environments.