Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity,Advanced Materials

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Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity
Advanced Materials ( IF 27.4 ) Pub Date : 2018-09-14 , DOI: 10.1002/adma.201803388
Geun Yeol Bae ₁ , Joong Tark Han ₂ , Giwon Lee ₁ , Siyoung Lee ₁ , Sung Won Kim ₁ , Sangsik Park ₁ , Jimin Kwon ₃ , Sungjune Jung ₃ , Kilwon Cho ₁

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Human skin imperfectly discriminates between pressure and temperature stimuli under mixed stimulation, and exhibits nonlinear sensitivity to each stimulus. Despite great advances in the field of electronic skin (E‐skin), the limitations of human skin have not previously been overcome. For the first time, the development of a stimulus‐discriminating and linearly sensitive bimodal E‐skin that can simultaneously detect and discriminate pressure and temperature stimuli in real time is reported. By introducing a novel device design and using a temperature‐independent material, near‐perfect stimulus discriminability is realized. In addition, the hierarchical contact behavior of the surface‐wrinkled microstructure and the optimally reduced graphene oxide in the E‐skin contribute to linear sensitivity to applied pressure/temperature stimuli over wide intensity range. The E‐skin exhibits a linear and high pressure sensitivity of 0.7 kPa⁻¹ up to 25 kPa. Its operation is also robust and exhibits fast response to pressure stimulus within 50 ms. In the case of temperature stimulus, the E‐skin shows a linear and reproducible temperature coefficient of resistance of 0.83% K⁻¹ in the temperature range 22–70 °C and fast response to temperature change within 100 ms. In addition, two types of stimuli are simultaneously detected and discriminated in real time by only impedance measurements.

中文翻译：

具有刺激性和线性灵敏度的压力/温度传感双峰电子皮肤

在混合刺激下，人类皮肤无法完美地区分压力和温度刺激，并且对每种刺激均表现出非线性敏感性。尽管电子皮肤（E-skin）领域取得了长足的进步，但人类皮肤的局限性尚未克服。首次报道了可区分刺激和线性敏感的双峰E皮肤的开发，该皮肤可以实时检测和区分压力和温度刺激。通过引入新颖的设备设计并使用与温度无关的材料，可以实现近乎完美的刺激可分辨性。此外，表面起皱的微观结构的分层接触行为以及电子皮肤中最佳还原的氧化石墨烯有助于在较宽的强度范围内对施加的压力/温度刺激产生线性敏感性。电子皮肤表现出0.7 kPa的线性和高压灵敏性^-1至25 kPa。它的操作也很牢固，并且在50毫秒内对压力刺激表现出快速响应。在温度刺激的情况下，E皮肤在22–70°C的温度范围内显示出0.83％K ^-1的线性且可再现的电阻温度系数，并在100毫秒内快速响应温度变化。另外，仅通过阻抗测量就可以同时实时检测和区分两种类型的刺激。

更新日期：2018-09-14

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