Department of Biomechatronics Engineering, National Taiwan University, 10617 Taipei, Taiwan.
Department of Chemical Engineering, National Taiwan University, 10617 Taipei, Taiwan.
Biosensors (Basel). 2023 Jan 22;13(2):174. doi: 10.3390/bios13020174.
Skin-inspired flexible tactile sensors, with interfacial microstructure, are developed on cellulose fiber substrates for subtle pressure applications. Our device is made of two cellulose fiber substrates with conductive microscale structures, which emulate the randomly distributed spinosum in between the dermis and epidermis layers of the human skin. The microstructures not only permit a higher stress concentration at the tips but also generate electrical contact points and change contact resistance between the top and bottom substrates when the pressure is applied. Meanwhile, cellulose fibers possessing viscoelastic and biocompatible properties are utilized as substrates to mimic the dermis and epidermis layers of the skin. The electrical contact resistances (ECR) are then measured to quantify the tactile information. The microstructures and the substrate properties are studied to enhance the sensors' sensitivity. A very high sensitivity (14.4 kPa) and fast recovery time (approx. 2.5 ms) are achieved in the subtle pressure range (approx. 0-0.05 kPa). The device can detect subtle pressures from the human body due to breathing patterns and voice activity showing its potential for healthcare. Further, the guitar strumming and chord progression of the players with different skill levels are assessed to monitor the muscle strain during guitar playing, showing its potential for posture feedback in playing guitar or another musical instrument.
基于纤维素纤维基底开发了具有界面微结构的仿皮肤柔性触觉传感器，用于微妙的压力应用。我们的设备由两个带有导电微尺度结构的纤维素纤维基底组成，这些结构模拟了人类皮肤的真皮和表皮层之间随机分布的棘突。这些微结构不仅允许在尖端处更高的应力集中，而且当施加压力时，还会在顶部和底部基底之间产生电接触点并改变接触电阻。同时，具有粘弹性和生物相容性的纤维素纤维被用作基底来模拟皮肤的真皮和表皮层。然后测量电接触电阻 (ECR) 以量化触觉信息。研究了微结构和基底特性以提高传感器的灵敏度。在微妙的压力范围内（约 0-0.05 kPa），实现了非常高的灵敏度（14.4 kPa）和快速恢复时间（约 2.5 ms）。由于呼吸模式和声音活动，该设备可以检测人体的微妙压力，显示出其在医疗保健方面的潜力。此外，评估了不同技能水平的演奏者的吉他弹奏和和弦进行，以监测吉他演奏时的肌肉紧张程度，显示出其在吉他或其他乐器演奏中的姿势反馈方面的潜力。
