Enhanced sensitivity of piezoelectric pressure sensor with microstructured polydimethylsiloxane layer

被引：89
作者：
Choi, Wook [1 ]
Lee, Junwoo [1 ]
Yoo, Yong Kyoung [1 ]
Kang, Sungchul [2 ]
Kim, Jinseok [2 ]
Lee, Jeong Hoon [1 ]
机构：
[1] Kwangwoon Univ, Dept Elect Engn, Seoul 139701, South Korea
[2] KIST, Seoul 136791, South Korea
来源：
APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 12期
关键词：
FILM; TRANSDUCTION; FINGER; RUBBER; TOUCH;
D O I：
10.1063/1.4869816
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Highly sensitive detection tools that measure pressure and force are essential in palpation as well as real-time pressure monitoring in biomedical applications. So far, measurement has mainly been done by force sensing resistors and field effect transistor (FET) sensors for monitoring biological pressure and force sensing. We report a pressure sensor by the combination of a piezoelectric sensor layer integrated with a microstructured Polydimethylsiloxane (mu-PDMS) layer. We propose an enhanced sensing tool to be used for analyzing gentle touches without the external voltage source that is used in FET sensors, by incorporating a microstructured PDMS layer in a piezoelectric sensor. By measuring the directly induced electrical charge from the microstructure-enhanced piezoelectric signal, we observed a 3-fold increased sensitivity in a signal response. Both fast signal relaxation from force removal and wide dynamic range from 0.23 to 10 kPa illustrate the good feasibility of the thin film piezoelectric sensor for mimicking human skin. (C) 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4869816]
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页数：4
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