2024-05-02 テキサス大学オースチン校(UT Austin)
＜関連情報＞
- https://news.utexas.edu/2024/05/02/stretchable-e-skin-could-give-robots-human-level-touch-sensitivity/
- https://www.sciencedirect.com/science/article/abs/pii/S2590238524001644?dgcid=author
伸縮可能なハイブリッド応答圧力センサー Stretchable hybrid response pressure sensors
Kyoung-Ho Ha, Zhengjie Li, Sangjun Kim, Heeyong Huh, Zheliang Wang, Hongyang Shi, Charles Block, Sarnab Bhattacharya, Nanshu Lu
Matter Published: May 1, 2024
DOI:https://doi.org/10.1016/j.matt.2024.04.009
Highlights
- Hybrid piezoresistivity and piezocapacitivity allow accurate pressure measurement
- Hybrid response occurs under pressure, while capacitive response occurs under stretch
- Optimal CNT doping ratio in PNC achieves highest pressure sensitivity of SHRPS
- Analytical models show SHRPS is governed by a new mechanism, not material properties
Progress and potential
Accurate pressure measurement holds critical importance across various fields such as soft robotics, bio-mimetics, and biosensors, where surfaces are subject to stretching. Despite considerable advancements in material and structural innovations enabling the fabrication of stretchable pressure sensors, a significant challenge persists: these sensors exhibit sensitivity to both in-plane stretch and out-of-plane pressure, rendering them inaccurate when subjected to simultaneous stretch and pressure. To address this challenge, we introduce intrinsically stretchable hybrid response pressure sensors (SHRPSs), which boast ultrahigh pressure sensitivity while effectively mitigating stretch-induced interference. The introduction of SHRPSs marks a significant milestone, poised to greatly enhance the versatility of electronic skin applications.
Summary
Touch-sensitive stretchable electronic skins (e-skins) hold promise for soft robots, prosthetics, bio-mimetics, and bio-sensors. However, a long-standing challenge has been the interference of stretching in pressure readings. Addressing this, we introduce an intrinsically stretchable hybrid response pressure sensor (SHRPS) composed of a laminate featuring a barely conductive porous nanocomposite and an ultrathin dielectric layer situated between two stretchable electrodes. The combined piezoresistive and piezocapacitive responses of the SHRPS enable ultrahigh pressure sensitivity while effectively negating stretch-induced interference. Our findings are underpinned by an experimentally validated electromechanical model. In practical applications, SHRPS mounted on inflatable probes demonstrated safe and precise palpation on the human wrist and conformable and firm gripping of contoured objects. The debut of SHRPS promises to significantly expand the versatile applications of e-skins.
Graphical abstract
