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Sensors 2017, 17(7), 1464; doi:10.3390/s17071464

Paper as Active Layer in Inkjet-Printed Capacitive Humidity Sensors

Printed Functional Solutions, VTT Technical Research Centre of Finland, Espoo 02044, Finland
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Received: 21 May 2017 / Revised: 19 June 2017 / Accepted: 20 June 2017 / Published: 22 June 2017
(This article belongs to the Special Issue Flexible Electronics and Sensors)
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Abstract

An inkjet-printed relative humidity sensor based on capacitive changes which responds to different humidity levels in the environment is presented in this work. The inkjet-printed silver interdigitated electrodes configuration on the paper substrate allowed for the fabrication of a functional proof-of-concept of the relative humidity sensor, by using the paper itself as a sensing material. The sensor sensitivity in terms of relative humidity changes was calculated to be around 2 pF/RH %. The response time against different temperature steps from 3 to 85 °C was fairly constant (about 4–5 min), and it was considered fast for the aimed application, a smart label. View Full-Text
Keywords: inkjet printing; paper; humidity sensor; nanoparticles; silver inkjet printing; paper; humidity sensor; nanoparticles; silver
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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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Gaspar, C.; Olkkonen, J.; Passoja, S.; Smolander, M. Paper as Active Layer in Inkjet-Printed Capacitive Humidity Sensors. Sensors 2017, 17, 1464.

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