Paper-based interdigitated impedance sensor for moisture and vapor measurements
Sprache des Titels:
2017 IEEE SENSORS Proceedings
A low-cost, easy-to-fabricate paper-based capacitance sensor with inkjet printed interdigitated electrodes is presented. The sensor enables measurements of the dielectric properties of electrode free polymer films, a quick technique for assessing the insulating quality of polymer sheets. We demonstrate the suitability of the sensor for moisture and vapor measurements,
permitting direct operation of the sensor in water or body fluids. Potential applications of the sensors may arise in smart diapers and wound dressings. In addition, the sensors allow for the study of water adsorption and desorption kinetics under a wide range of humidity conditions. We show that the effective permittivity of the sensor follows a Guggenheim?Anderson-DeBoer sorption isotherm, enabling us to simultaneously record and quantitatively analyze the wetting and drying of moist paper in printed electronics manufacturing.