Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity
Pressure/Temperature Sensing Bimodal Electronic Skin with Stimulus Discriminability and Linear Sensitivity
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DOI：
10.1002/adma.201803388
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发表时间：
2018-10-25
影响因子：
29.4
通讯作者：
Cho, Kilwon
中科院分区：
文献类型：
--
作者：
Bae, Geun Yeol;Han, Joong Tark;Cho, Kilwon
在混合刺激下，人体皮肤对压力和温度刺激的区分不完全，并且对每种刺激都表现出非线性敏感性。尽管电子皮肤（E-skin）领域取得了巨大的进步，但人类皮肤的局限性以前还没有被克服。首次报道了一种可以同时检测和实时识别压力和温度刺激的线性敏感双峰电子皮肤的开发。通过引入一种新颖的器件设计和使用温度无关的材料，实现了近乎完美的刺激判别。此外，表面褶皱微结构的分层接触行为和E-skin中最佳还原的氧化石墨烯有助于在宽强度范围内施加压力/温度刺激的线性灵敏度。E-skin具有0.7 kPa（-1）到25 kPa的线性高压灵敏度。其运行稳健，对压力刺激的响应速度在50ms内。在温度刺激下，在22 ~ 70℃温度范围内，E-skin的电阻温度系数为0.83% (K-1)，线性重现性好，对温度变化的响应速度在100 ms以内。此外，仅通过阻抗测量就可以同时检测和实时区分两种类型的刺激。
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 degrees 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.