Physical and chemical sensors Humidity sensors Transparent conducting oxides Capacitive sensor Indium tin oxide
MCGHEE, J.R. ... et al, 2018. Humidity sensing properties of transparent sputter coated indium tin oxide and printed polymer structures. IEEE Sensors Journal, 18(18), pp. 7358-7364.
The humidity sensing properties of sputter coated indium tin oxide (ITO) and printed dielectric structures were tested for samples with sheet resistances ranging from 10Ω/sq to 50Ω/sq. ITO/Polymer composite sensors were fabricated to form a parallel plate capacitive based humidity sensor that could detect relative humidity within a tested range of 5%to 95%. The sensors were most stable and gave a linear response between 5 and 75% relative humidity. The capacitive sensors were characterized, using a range of techniques, to establish their capability and performance as humidity monitors. Response time of the humidity sensors was measured to be an average of 31.5 seconds and recovery time was measured at an average of 31 seconds in capacitive mode. Complex impedance spectroscopy was used to determine the mechanism of action for the sensors which was found to be both diffusion of water molecules into the dielectric layer and an increase of ionic conductivity within the dielectric layer. Stability of the humidity sensors were tested at three different humidity levels over 7 days and sensors were found to be stable or follow a predictable change for this time span.
This is an Open Access Article. It is published by IEEE under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
The research was funded as part of the EPSRC
grant (EP/L017709/1) for research into “Sustainable Manufacturing of Transparent Conducting Oxide (TCO) Inks and Thin Films” - a collaboration between Loughborough
University’s Design School, the Department of Chemistry, Wolfson School of Mechanical Engineering and Manufacturing and University College London (UCL).