Synergistic Magnetoelectric Janus Films With Hierarchical Interfaces for High-Efficiency EMI Shielding and Multimodal Thermal Management.

The development of flexible wearable films integrating high electromagnetic interference (EMI) shielding effectiveness (SE), multimodal thermal management, and adaptability to complex environments remains a major challenge. Herein, a multifunctional asymmetric ultrathin film composed of a silver nanowires (AgNWs)/waterborne polyurethane (WPU) layer, FeCoNi/polyacrylonitrile‌ fibrous layer, and FeCo@Ti3C2Tx/WPU layer was successfully fabricated through electrospinning combined with a layered blade-coating strategy. The AgNWs network and FeCo@Ti3C2Tx magnetoelectric coupling yielded an average EMI SE of 78.17 dB, with absorption as the primary shielding mechanism (SEA/SET = 93.61%). Furthermore, stable dual-mode electrothermal/photothermal was achieved by exploiting the high conductivity of AgNWs and the excellent photothermal conversion capability of FeCo@Ti3C2Tx. Saturated temperatures of 120.1°C and 76.4°C were reached under a voltage of 1.0 V and light irradiation of 300 mW cm-2, respectively, accompanied by rapid thermal response and excellent cycling stability. Notably, typical Janus wettability characteristics were also observed, with water contact angles of 70.27° and 122.22° on the two sides. The film demonstrates significant integrated advantages in electromagnetic protection, intelligent thermal management, and complex-environment adaptability, providing a feasible pathway for the practical development of next-generation intelligent flexible wearable electronics.