American Scientific Publishers, Sensor Letters, 3(5), p. 528-532
DOI: 10.1166/sl.2007.227
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Humidity sensors based on nanobeads of conjugated polymers, i.e., polyphenylacetylene (PPA) and poly[phenylacetylene-(co-2-hydroxyethyI methacrylate] P(PA/HEMA), prepared by modified emulsion polymerization technique, have been developed using resistive type and quartz crystal microbalance (QCM) devices. The investigations on the electrical response of PPA and P(PA/HEMA) nanobeads were performed and resistive humidity sensors based on ordered arrays of these nanostructured polymeric materials showed fast and reproducible current intensity variations in the range of relative humidity RH 5 - 90%. Polymeric nanostructured films deposited on the quartz electrode of QCM showed a linear sensitivity of 0.024 Hz/ppmv and short response time.