Bio‐Inspired Hybrid Dielectric for Capacitive and Triboelectric Tactile Sensors with High Sensitivity and Ultrawide Linearity Range

• DOI: 10.1002/adma.202100859
• Publication Date: 2021-06-02T03:50:54Z
• Authors: Bing Ji; Qian Zhou; Bin Hu; Junwen Zhong; Jun Zhou; Bingpu Zhou
• Keywords: Linearity; Tactile sensor

Abstract The trade‐off between sensitivity and linearity is critical for preserving the high pressure‐resolution over a broad range simplifying signal processing/conversion of flexible tactile sensors. Conventional dielectrics suffer from difficulty quantitatively controlling interacted mechanical dielectric properties, thus causing restricted capacitive Herein, inspired by human skin, novel hybrid composed low‐permittivity (low‐ k ) micro‐cilia array, high‐permittivity (high‐ rough surface, micro‐dome array developed. pressure‐induced series‐parallel conversion low‐ high‐ components enables linear effective constant controllable initial/resultant capacitance. gradient compressibility behavior elastic modulus with pressures, which derives capacitance variation determined constant. Therefore, an ultrawide up to 1000 kPa 0.314 –1 are simultaneously achieved optimized dielectric. design also applicable triboelectric sensors, realizes similar output voltage enhanced sensitivity. With across range, potential applications such as healthcare monitoring in diverse scenarios control command via single sensor demonstrated.