Fingertip-inspired electronic skin based on triboelectric sliding sensing and porous piezoresistive pressure detection
Fingertip-inspired electronic skin based on triboelectric sliding sensing and porous piezoresistive pressure detection
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DOI：
10.1016/j.nanoen.2017.08.001
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发表时间：
2017-10-01
期刊：
影响因子：
17.6
通讯作者：
Zhang, Haixia
中科院分区：
文献类型：
--
作者：
Chen, Haotian;Miao, Liming;Zhang, Haixia
指尖是人体内机械感受器密度最大的区域。受其复杂的解剖结构的启发，我们设计了一种指尖状的电子皮肤（e-skin），可以同时检测横向和垂直方向的运动。该装置包括三个部分，分别对应于人的指纹、表皮和真皮。所制备的双螺旋碳纳米管-聚二甲基硅氧烷（CNT-PDMS）电极和基底分别模拟指纹和表皮的结构。基于摩擦起电效应，双螺旋碳纳米管-聚二甲基硅氧烷电极在不同粗糙表面上滑动时产生不同频率的交变电压，在真实的皮肤中表现出快速适应（FA）特性。多孔碳纳米管-聚二甲基硅氧烷（CNT-PDMS）用于压力检测，模拟皮肤的慢适应功能和真皮结构。采用一种低成本的方法制备了多孔碳纳米管-聚二甲基硅氧烷（CNT-PDMS），并可同时调节其孔隙率和电阻率，这为调节其灵敏度提供了一种途径。在滑动传感和压力传感的帮助下，该装置可以执行许多复杂的任务，如区分表面粗糙度和保持释放执行，这大大扩展了电子皮肤的应用领域。
Fingertip is the region with the largest density of mechanoreceptors in human body. Inspired by its complicated anatomical structure, we design a fingertip-like electronic skin (e-skin) that can simultaneously detect the movements from lateral and vertical directions. The device includes three parts that correspond to fingerprint, epidermis and dermis of the human being, respectively. The fabricated double spiral carbon nanotube-poly-dimethylsiloxane (CNT-PDMS) electrodes and substrate mimic the structure of fingerprint and epidermis, respectively. Based on triboelectrification effect, the double spiral CNT-PDMS electrodes can generate alternating voltage with different frequencies when sliding across different rough surfaces, which behaves like fast adapting (FA) in real skin. Porous CNT-PDMS is used for detecting pressure, mimicking the function of slow adapting (SA) and the structure of dermis. A cost efficient way to fabricated porous CNT-PDMS is adopted and it can modulate the porosity and resistance at the same time, which provides a way to modulate its sensitivity. With the help of both sliding sensing and pressure sensing, this device can execute many complicated tasks such as differentiating roughness of surfaces and holding-releasing execution, which greatly expands the application fields of e-skin.