RECENT DEVELOPMENTS IN FIELD-EFFECT GAS SENSORS

Some of the ongoing studies at our laboratory of gas-sensitive field-e ffect devices with catalytic metal gates are reviewed. More particular ly, we discuss the use of such devices in so-called electronic noses d ue to the possibility of changing the selectivity patterns of the devi ces by the choice of catalytic metal and operation temperature. Severa l examples of the application of electronic noses consisting of field- effect devices in combination with metal oxide-based sensors are given . Finally, a summary is given of some remaining scientific problems an d studies related to the understanding and development of gas-sensitiv e field-effect devices.