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Sandwich-structured High-sensitivity Resistive Pressure Sensor based on Silver Nanowire  

Lee, Jinyoung (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Kim, Gieun (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Shin, Dongkyun (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Park, Jongwoon (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Semiconductor & Display Technology / v.17, no.2, 2018 , pp. 1-5 More about this Journal
Abstract
Elastic resistive pressure sensor is fabricated by a direct spray coating of silver nanowires (AgNWs) on uncured polydimethylsiloxane (PDMS) and an additional coating of a conductive polymer, poly(3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS). To improve the sensitive and stability, we have fabricated sandwich-structured AgNW/polymer sensor where two AgNW/polymer-coated PDMS films are laminated with the conducting surfaces contacted by pressure lamination. It shows a resistance decrease upon loading due to the formation of dense network of AgNWs. It is demonstrated that the sandwich-structured AgNW/polymer sensor exhibits very high sensitivity ($2.59kPa^{-1}$) and gauge factor (37.8) in the low pressure regime. It can also detect a subtle placement and removal of a weight as low as 3.4 mg, the corresponding pressure of which is about 5.4 Pa. It is shown that the protrusion of AgNWs from PDMS is suppressed substantially by the over-coated PEDOT:PSS layer, thereby reducing hysteresis and rendering the sensor more stable.
Keywords
Resistive Pressure Sensor; Silver Nanowire (AgNW); PEDOT:PSS; PDMS; Sandwich Structure;
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Times Cited By KSCI : 1  (Citation Analysis)
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