• Hierarchical polyimide nonwoven fabric with ultralow-reflectivity EMI shielding and high-temperature resistant infrared stealth is fabricated via alkali treatment, in-situ growth of magnetic particles, and self-activated electroless Ag plating.
• Impedance matching structure assembled from Fe3O4/Ag-loaded PI (PFA) and pure Ag-coated PI (PA) enhances EM wave absorption and dissipation, achieving ultralow reflectivity.
• The fluffy 3D structure of PFA provides thermal insulation, while the low infrared emissivity of PA ensures excellent infrared stealth performance.
• Strong interfacial bonding between Fe3O4, Ag, and PI fibers ensures thermal stability, making the material promising for military tent applications.