Flexible magnetoelectric coupling nanocomposite films with multilayer network structure for dual-band EMI shielding

The rapid development of electronic information technology has brought huge challenges to high-performance electromagnetic interference (EMI) shielding films, especially for multi-band shielding. In this work, the core-shell structure of polydopamine coated silver nanowires (AgNWs) was formed by in situ polymerization of dopamine on the surface of AgNWs, the modified AgNWs were attached to the layered graphene surface through noncovalent bonds, magnetic Fe₃O₄ particles were then loaded on graphene/AgNWs to form magnetoelectric coupling fillers and cast with polyvinyl alcohol (PVA) to obtain nanocomposite films. The conductive fillers were uniformly dispersed in the PVA matrix with well compatibility, the resulting composite films not only displayed good flexibility, but also had been first time reported to show fine EMI shielding performance in both GPS band and X band thanks to the synergistic effect from the combination of conductive and magnetic fillers through an innovative structure. These nanocomposite films with good EMI shielding properties would show good application prospects in the fields of flexible electronics, electromagnetic countermeasure and stealth materials.