Janus-Structured Silver Nanowires/Cellulose Nanofiller/Fe₃O₄ Nanocomposite Films for EMI Shielding and Thermal Management

With the rapid development of aerospace, smart wearable electronic devices, and 5G technology, the issue of electromagnetic radiation has gained significant prominence, necessitating the urgent development of efficient electromagnetic shielding materials. In this study, a Janus-structured AgNWs/CNF/Fe3O4 nanocomposite film was successfully prepared using nanomaterials through vacuum filtration and hot-pressing methods. The Janus-structured nanocomposite film exhibited excellent electrical conductivity of 196,078 S/m and efficient electromagnetic interference (EMI) shielding performance of 76.0 dB (AgNW side). Additionally, it demonstrated a remarkable tensile strength of 67.8 MPa and favorable temperature-voltage response characteristics (high Joule heating temperature at low supply voltage (1.2 V, 147.4 °C) and fast response time (7 s)). These superior properties were attributed to the synergistic coupling between AgNWs and Fe3O4. Therefore, this flexible and multifunctional Janus-structured nanocomposite film, which combined efficient EMI shielding and thermal management performance, holds significant application potential in the aerospace, smart wearable electronics, and 5G communication fields.