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Vol. 101, Issue 2, February 2009, pp.52-59





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


1,*Hee C. LIM, 1Yew Fong HOR, 1Yew L. HOR, 2James L. ZUNINO III
 and 1John F. FEDERICI

1New Jersey Institute of Technology, Physics Department,

Tiernan Hall, 161 Warren St., Newark, NJ 07103-3537

2U.S. Army RDE Command, AMSRD-AAR-MEE-M, Bldg 60, Picatinny Arsenal, NJ, 07806

*E-mail: HCL4186@njit.edu



Received: 6 December 2008   /Accepted: 20 February 2009   /Published: 28 February 2009


Abstract: 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 sensorís 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.


Keywords: Flexible substrate, Humidity sensor, Conducting polymer


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