Fabrication and Application of Highly Stretchable Conductive Fiber‐Based Electrode of Epoxy/NBR Electrospun Fibers Spray‐Coated with AgNW/PU Composites

Stretchable fiber‐based electrodes are highly desired for the applications of wearable electronics owing to their good durability, excellent deformability, and easy attachment onto a curved surface in comparison with thin film electrodes. However, it is a critical challenge to fabricate a fiber‐based electrodes with low surface roughness and high conductivity under a large mechanical strain. In this study, the fabrication of stretchable and conductive epoxy/NBR‐20 fiber, spray‐coated with silver nanowire/waterborne polyurethane composite, is demonstrated via the combination of electrospinning and spray‐coating techniques. Such a fiber‐based electrode can maintain low resistance (less than 150 Ω) by stretching up to 40% strain and sustain at 30% strain for 200 stretch/release cycles. The deformable conductive fibers can serve as a promising fiber‐based bottom electrode for resistive memory devices and show volatile DRAM characteristics with an ON/OFF memory ratio of 102. Stretchable fiber‐based electrodes with high electrical conductivity upon stretching and low surface roughness are required for wearable electronic devices. Herein, the fabrication of conductive fiber‐based electrode, epoxy/NBR‐20 spray‐coated with AgNW2.0WPU1.0, upon stretching is demonstrated. The prepared fiber‐based electrode can maintain low resistance within 100 Ω at 30% strain for 200 cycles.