Flexible PAN@PDA@Ag nanofiber membranes for controllable electromagnetic interference shielding

With the rapid development of next-generation wireless communication technologies, electromagnetic pollution has become an issue that cannot be overlooked. Designing lightweight, flexible composite materials with excellent electromagnetic shielding properties has become a significant challenge. This study designed a double-layer core-shell structure to fabricate polymer-based PAN@PDA@Ag nanofiber membranes. Scanning electron microscopy (SEM) studies revealed that the nanofiber exhibits a distinct core-shell structure. PAN@PDA nanofiber adsorbs silver nanoparticles (AgNPs) via chemical reduction, forming a dense conductive network layer. The morphology of fibers is achieved by regulating the contents of PDA. The [email protected] @Ag-90 fiber membranes, with a thickness of 0.06 mm, show an impressive conductivity of 3601.76 S/m and a shielding effectiveness of 85.6 dB. This work demonstrates that the synergistic effect among the components endows the composite with outstanding electromagnetic shielding performance, offering promising prospects for applications in next-generation wireless technologies.