Flexible pressure sensor with tunable sensitivity and responsive range for adaptive wearable electronics

Abstract Flexible pressure sensors are a key component of electronic skins (e‐skins), converting mechanical stimuli into easily analyzed electrical signals. These sensors need to be highly sensitive to respond to small changes in external stimuli. However, balancing the trade‐off between sensitivity and pressure monitoring range remains a significant challenge. Here, we fabricated a capacitive tunable pressure sensor (TPS), based on the synergistic effect within a composite material, composed of a sponge‐like porous structure and thermoplastic expandable microspheres (TEMs). By adjusting the temperature to drive the expansion of the TEMs, mode switching between low and high compression modulus was achieved. This enables high sensitivity (2.39 kPa −1 ) in low compression modulus mode and a wide pressure monitoring range (up to 953.96 kPa) in high compression modulus mode. TPSs are applicable in diverse fields, from detecting subtle pressures like human pulse and respiration to measuring larger pressures based on touch, and even vehicle loads. These sensors can also be integrated with machine learning algorithms for object recognition. The success of TPS is expected to provide new ideas in solving the trade‐off between sensitivity and pressure monitoring range of flexible pressure sensors. image