Preparation of poly(3,4-ethylenedioxythiophene) films on piezoelectric quartz crystal and their gas sensitivities I.Pasquini1, M.L.Foresti2, M.Innocenti2, A.Fort1, M.Mugnaini1, L.Pigani3,

Conducting polymers has been a subject of growing interest in recent years for sensing application, since they have the capability of offering amplified sensitivity and real time response as a result of enhanced interaction between the sensitive layer and the analyte [1-5]. However, QCM NO2 sensors did not yet have a large diffusion: the principal aim of this work is to realize a new gas sensor applying the quartz crystal microbalance (QCM) technology. The sensitive layer is obtained by electropolymerization of EDOT on metal electrodes of a 10 MHz AT-cut commercial quartz crystal. The sensor performance in terms of sensitivity and selectivity were assessed exploiting an ad hoc chemical sampling unit, and a low noise conditioning and processing electronic system. This latter consists of an oscillator hosting the piezoelectric resonator, and of a frequency measurement system granting a (short time) relative accuracy o