2134/34283 Jack McGhee Jack McGhee Jagdeep Sagu Jagdeep Sagu Darren Southee Darren Southee Upul Wijayantha-Kahagala-Gamage Upul Wijayantha-Kahagala-Gamage Humidity sensing properties of transparent sputter-coated indium-tin oxide and printed polymer structures Loughborough University 2018 Physical and chemical sensors Humidity sensors Transparent conducting oxides Capacitive sensor Indium tin oxide Design Practice and Management not elsewhere classified Mechanical Engineering 2018-08-02 15:53:56 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Humidity_sensing_properties_of_transparent_sputter-coated_indium-tin_oxide_and_printed_polymer_structures/9346694 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.