Humidity Sensors Using Chemically Modified Polymer Thin Films

Most of the humidity sensors practically used are based on the change in electrical properties of polymers or ceramics with humidityThey are either resistive-type or capacitive-type sensorsVarious chemical modifications of polymeric materials have beell utilized to improve the properties of sensors such as sensitivity hysteresislong-term stabilitydurability in unfavorable atmospheres such as dewdrops or vapors of volatile organic compounds(VOC)etcThis paper overviews the novel methods of chemical modification which have been proposed by the authors 5 Humidity SensorPolymerImpedanceCapacitance 11ntroluction Since the invention of an electrical humidity sensor by Dunmore based on LiC1various types of materials such as ceramicsmetal oxide filmsorganic materials