伸縮自在の電子皮膚、ロボットに人間レベルの触覚感度を与える可能性(Stretchable E-Skin Could Give Robots Human-Level Touch Sensitivity)

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2024-05-02 テキサス大学オースチン校(UT Austin)

テキサス大学オースティン校の研究者たちが開発した新しい伸縮性のある電子スキン(e-skin)は、ロボットや他のデバイスに人間の皮膚と同じ柔らかさと触覚感度を与えることができます。このe-skinは、伸びても感圧反応が変わらないという大きな進歩を達成しました。これにより、医療ケアなどの繊細なタッチが必要な作業が可能になり、将来的には介護が必要な高齢者問題の解決にも寄与すると期待されています。また、災害時の救助活動など、さまざまな場面での応用が考えられます。

<関連情報>

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

伸縮自在の電子皮膚、ロボットに人間レベルの触覚感度を与える可能性(Stretchable E-Skin Could Give Robots Human-Level Touch Sensitivity)

0402電気応用
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