In Situ Grown Silver@Aramid Nanofiber Composite Films With 3D Continuous Conductive Network Toward Versatile Flexible Electronics and Artificial Intelligence‐Enhanced Intelligent Sensing Recognition

ABSTRACT Although conductive composites based on aramid nanofibers (ANFs) have been extensively investigated for flexible electronics, the majority of reports concentrate solely on single‐function optimization and are unable to meet the requirements of integrated multifunctional systems in next‐generation smart devices. Herein, a high‐performance silver@aramid nanofiber (Ag@ANF) composite film with a 3D continuous conductive network is fabricated via in situ reduction, vacuum filtration, and hot pressing. The optimized Ag@ANF‐4H composite film exhibits an electrical conductivity of 176 018 S m − 1 and a fracture stress of 36.4 MPa, achieving an excellent balance between electrical and mechanical properties. Based on the Ag@ANF composite film, we have successfully demonstrated six versatile applications, including a wearable electrothermal device with tensile strain over 200%, an Ag@ANF/polyethylene (PE) electrothermal actuator with a bending curvature of 1.89 cm −1 , an X‐band electromagnetic interference (EMI) shielding material with 77 dB effectiveness, a self‐powered triboelectric nanogenerator (TENG) sensor, and two machine learning‐integrated intelligent systems for handwriting recognition and material sorting, which enable real‐time character recognition and automatic metal/non‐metal sorting. This work not only improves the conductive performance of ANF‐based composites but also achieves versatile applications of a single material, broadening the application scope of ANF‐based composites in intelligent flexible electronics.