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Multi-Layered Flexible Pressure Sensors with Tunable Sensitivity and Linearity

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Title
Multi-Layered Flexible Pressure Sensors with Tunable Sensitivity and Linearity
Author
Myoung, Jinyoung
Advisor
Ko, Hyunhub
Keywords
Electronic skin
Issue Date
2019-08
Publisher
Graduate School of UNIST
Abstract
Tunable sensitivity and linearity of flexible pressure sensors are the critical requirements for various user-friendly customized application such as wearable devices, prosthesis and smart robotics. However, flexible pressure sensors with both high sensitivity and linearity over broad pressure range have been rarely demonstrated. Here, we demonstrate a highly-sensitive and linearly-responsive flexible pressure sensor, which is achieved by multi-layering of PEDOT:PSS/PUD composites with interlocked structures. The multi-layer with different conductivity enables easy regulation of the change of composite resistance in response to the applied pressure. Multi-layered pressure sensors could linearly perceive the pressure over broad working pressure range of 100 kPa with the sensitivity of 3.1 x105 kPa-1, which is the highest one among the pressure sensors reported so far. In addition, it shows a rapid response time of 130 ms and relaxation time of 13 ms and high durability over 5000 repetitive cycles under the pressure of 20 kPa. Owing to the high sensitivity, it can discriminate weak gas flow with different air density, delicate hand manipulation of objects and different pulse rate of carotid artery and internal jugular vein.
Description
Department of Chemical Engineering
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ECHE_Theses_Master
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