In this communication, evidence is provided that an organic thin-film-trans
istor (OTFT) can be used as a novel gas sensor. When exposed to chemical sp
ecies at room temperature, four parameters can be measured: the bulk conduc
tivity of the organic thin film, the field-induced conductivity, the transi
stor threshold voltage and the field effect mobility. Measurements of these
parameters may allow for recognition of molecular species. (C) 2000 Elsevi
er Science S.A. All rights reserved.