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Setup and properties of a fully inkjet printed humidity sensor on PET substrate

: Starke, E.; Turke, A.; Schneider, M.; Fischer, W.-J.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Sensors 2012. Vol.1 : Taipei, Taiwan, 28 - 31 October 2012; the 11th IEEE Sensors Conference
New York, NY: IEEE, 2012
ISBN: 978-1-4577-1765-9
ISBN: 978-1-4577-1766-6
ISBN: 978-1-4577-1767-3
Conference on Sensors <11, 2012, Taipei>
Fraunhofer IPMS ()

A fully ink jet printed humidity sensor on a thin PET foil is presented in this paper. Conductive silver electrodes were ink jet printed in the first step. Afterwards film forming polymer particles were printed on top as the humidity sensitive layer. Capacitance measurements were performed to investigate the sensor behavior at different humidity levels. By optimization of the electrode printing parameters the required sensor area was significantly reduced. Systematic investigations for the improvement of the humidity dependent layer led to a suitable polymer film, which combines good processability by inkjet printing with adequate humidity sensitivity and small hysteresis. The proposed sensor shows a high potential for low cost applications, which requires thin and flexible humidity sensors. For the correction of the nonlinear sensor transfer function a correction function with three calibration points is proposed.