Bioinspired Dual‐Mode Stretchable Strain Sensor Based on Magnetic Nanocomposites for Strain/Magnetic Discrimination

Abstract

Abstract Recently, flexible stretchable sensors have been gaining attention for their excellent adaptability for electronic skin applications. However, the preparation of stretchable strain sensors that achieve dual‐mode sensing while still retaining ultra‐low detection limit of strain, high sensitivity, and low cost is a pressing task. Herein, a high‐performance dual‐mode stretchable strain sensor (DMSSS) based on biomimetic scorpion foot slit microstructures and multi‐walled carbon nanotubes (MWCNTs)/graphene (GR)/silicone rubber (SR)/Fe 3 O 4 nanocomposites is proposed, which can accurately sense strain and magnetic stimuli. The DMSSS exhibits a large strain detection range (≈160%), sensitivity up to 100.56 (130–160%), an ultra‐low detection limit of strain (0.16% strain), and superior durability (9000 cycles of stretch/release). The sensor can accurately recognize sign language movement, as well as realize object proximity information perception and whole process information monitoring. Furthermore, human joint movements and micro‐expressions can be monitored in real‐time. Therefore, the DMSSS of this work opens up promising prospects for applications in sign language pose recognition, non‐contact sensing, human‐computer interaction, and electronic skin.