Abstract
Electrically conductive fabric composites (CFCs) are recently developed for wearable electromagnetic interference (EMI) shielding materials. However, it remains challenging to increase the shielding effectiveness (SE) and reduce the electromagnetic wave reflection while ensure durability. Herein, we prepare flexible and magnetic CFCs with an asymmetric structure via integration of two functional layers and subsequent interfacial fusing through photothermal treatment. The obtained asymmetric nanofiber membrane (PANM) is composed of bottom conductive layer of silver nanoparticles (AgNPs) decorated polyurethane (PU) nanofibers and top magnetic layer of PU nanofibers loaded with ferric oxide nanoparticles (Fe3O4NPs). The EMI SE of the PANMs in the X-band can reach 69.6 dB with the absorption coefficient A of ∼0.21. In addition, the PANMs also show good mechanical properties, electrothermal and photothermal conversion performance, great surface stability and durability. The mechanically robust and multifunctional nanofiber composites have broad application prospects in wearable electronic devices and next-generation communication technologies.
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