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Sensors 2015, 15(1), 818-831; doi:10.3390/s150100818

Characterization of Piezoresistive PEDOT:PSS Pressure Sensors with Inter-Digitated and Cross-Point Electrode Structures

1
Department of Electronic Engineering, Chang Gung University, Kweishan 33302, Taoyuan, Taiwan
2
Healthy and Aging Center, Chang Gung University, Kweishan 33302, Taoyuan, Taiwan
3
Department of Neurosurgery, Chang Gung Memorial Hospital, Kweishan 33305, Taoyuan, Taiwan
*
Author to whom correspondence should be addressed.
Received: 11 November 2014 / Accepted: 25 December 2014 / Published: 5 January 2015
(This article belongs to the Section Physical Sensors)
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Abstract

The piezoresistive characteristics of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) pressure sensors with inter-digitated (IDE) and cross-point electrode (CPE) structures have been investigated. A small variation of the resistance of the pressure sensors with IDE without bottom indium-tin-oxide (b-ITO) film and with CPE structures was observed owing to the single carrier-conducting pathway. For the IDE pressure sensors with b-ITO, the piezoresistive characteristics at low and high pressure were similar to those of the pressure sensors with IDE without b-ITO and with CPE structures, respectively, leading to increased piezoresistive pressure sensitivity as the PEDOT:PSS film thickness decreased. A maximum sensitivity of more than 42 kΩ/Pa was achieved. When the normal pressure was applied, the increased number of conducting points or the reduced distance between the PEDOT oligomers within the PEDOT:PSS film resulted in a decrease of the resistance. The piezoresistive pressure sensors with a single carrier-conducting pathway, i.e., IDE without b-ITO and CPE structures, exhibited a small relaxation time and a superior reversible operation, which can be advantageous for fast piezoresistive response applications. View Full-Text
Keywords: piezoresistive; poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS); inter-digitated; cross-point; relaxation time piezoresistive; poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS); inter-digitated; cross-point; relaxation time
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, J.-C.; Karmakar, R.S.; Lu, Y.-J.; Huang, C.-Y.; Wei, K.-C. Characterization of Piezoresistive PEDOT:PSS Pressure Sensors with Inter-Digitated and Cross-Point Electrode Structures. Sensors 2015, 15, 818-831.

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