Supersensitive natural rubber-based piezoresistive pressure sensor with hierarchical sandwich structure

, response/recovery time of 20/53 ms and 20 000 loading-unloading cycles at 0-95% resistance change). Meanwhile, the sensor was successfully applied for human motion detection, health monitoring and Morse code signal transmission. Owing to the superhydrophobicity of the sensitive interlayer and porous protective layer, the sensor also exhibited potential for underwater sensing. Our findings conceivably stand out as a new strategy to prepare environmentally friendly and high-performance piezoresistive pressure sensors and will promote the sustainable development and application of flexible electronics.