Poly (3, 4-Ethylenedioxythiophene) - Poly (4-Styrenesulfonate) for Humidity Sensing Using Ink-jet Printing Technique on Flexible Polyimide Substrate

A fully reversible and repeatable flexible capacitive humidity sensor is realized from design concept to reality via an ink-jet deposition system. The humidity sensor is ink-jet fabricated with aqueous Poly (3, 4-ethylenedioxythiophene) - poly (4-styrenesulfonate), PEDOT: PSS ink and Toluene suspend...

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Bibliographic Details
Published inSensors & transducers Vol. 101; no. 2; pp. 52 - 59
Main Authors Lim, Hee C, Hor, Yew Fong, Hor, Yew L, Zunino, James L, Federici, John F
Format Journal Article
LanguageEnglish
Published Toronto IFSA Publishing, S.L 01.02.2009
Subjects
Accuracy
Conducting polymer
Data acquisition systems
Design
Environmental conditions
Environmental monitoring
Flexible substrate
Humidity
Humidity sensor
Light emitting diodes
Moisture content
Response time
Scientific apparatus & instruments
Sensors
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Summary:A fully reversible and repeatable flexible capacitive humidity sensor is realized from design concept to reality via an ink-jet deposition system. The humidity sensor is ink-jet fabricated with aqueous Poly (3, 4-ethylenedioxythiophene) - poly (4-styrenesulfonate), PEDOT: PSS ink and Toluene suspended nano Ag particles of 5 nm sized solution. The humidity is monitored by changes in the sensor's effective inter-digitated electrodes capacitance. The humidity sensor exhibits sensitivity with resolution and accuracy of 0.0067 nF/ %RH and 1% RH, respectively, towards the relative environmental moisture concentrations of 32% RH to 100% RH. A fast absorption time of < 1 second and desorption time of approximately 3 second for the humidity sensor is observed. [PUBLICATION ABSTRACT]
ISSN:2306-8515
1726-5479