In this paper the authors describe the development and the characterization of a Quartz Crystal Microbalance (QCM) sensor for N02 detection with the sensitive layer made of a thin films of poly (3,4-ethylenedioxythiophene) (PEDOT). The PEDOT layer was obtained by electropolymerization on one of the gold 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 of approximately 10-8 , which ensures a mass resolution in the order of the ng. The preliminary obtained results show a N02 resolution and sensitivity of the order of 1 ppm, and 2.6 Hz/ppm, respectively, at 35°C constant room temperature and in a dry environment, and show that a satisfactory repeatability can be achieved with recovery cycles in N2 at room temperature.
N02 QCM gas sensor based on electrochemical deposition of PEDOT / FortI A.; Innocenti M.; Foreste M.L.; Mugnaini M.; Pasquini I.; Pigani L.; Rocchil S.; Vignoli V.. - ELETTRONICO. - (2009), pp. 184-187. ( 3rd International Workshop on Advances in Sensors and Interfaces, IWASI 2009 Trani, ita 2009) [10.1109/IWASI.2009.5184792].
N02 QCM gas sensor based on electrochemical deposition of PEDOT
FortI A.;Innocenti M.;Vignoli V.
2009
Abstract
In this paper the authors describe the development and the characterization of a Quartz Crystal Microbalance (QCM) sensor for N02 detection with the sensitive layer made of a thin films of poly (3,4-ethylenedioxythiophene) (PEDOT). The PEDOT layer was obtained by electropolymerization on one of the gold 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 of approximately 10-8 , which ensures a mass resolution in the order of the ng. The preliminary obtained results show a N02 resolution and sensitivity of the order of 1 ppm, and 2.6 Hz/ppm, respectively, at 35°C constant room temperature and in a dry environment, and show that a satisfactory repeatability can be achieved with recovery cycles in N2 at room temperature.
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