Multifunctional AgNWs-Fe3O4/ANF composite films with a Janus-like structure for outstanding electromagnetic interference shielding and thermal management

Abstract

Due to the rapid growth in the miniaturization, portability, and flexibility of electronic devices, the demand for polymer composites with high thermal conductivity and electromagnetic shielding properties has increased significantly. Herein, we present a multifunctional thin film with a Janus-like structure that simultaneously enhances conductivity and electromagnetic interference shielding effectiveness. Owing to the unique Janus-like structure, heating performance tests show that the composite film has a high Joule heating temperature of 129.4 °C at a low supply voltage of 3.0 V, a fast response time of less than 12 seconds, and excellent sensitivity, heating stability and reliability. In addition, the electromagnetic interference shielding effectiveness of AgNWs-Fe₃O₄/ANF can reach 80.0 dB at 8.5 GHz. This excellent performance of this multifunctional bilayer composite film demonstrates its potential for advanced electronic applications such as wearable devices, artificial intelligence and high-performance heating devices.