Abstract
We have developed and evaluated a Polymer-based VOC (volatile organic compounds) sensor module to realize a low-cost wireless sensor network system for environmental monitoring. The polymer-based VOC sensor module consists of a polymer- based VOC sensor, a sensing circuit, a transmitter and a receiver. The polymer-based VOC sensor composed polycarbonate (PC) cantilevers with PVDF (polyvinylidene fluoride) piezoelectric films. We examined the change of resonance frequency in the presence of VOC vapor by setting up a resonant sensor evaluation system equipped with a VOC dilution flow system and temperature-controlled chamber. The resonant frequency of polymer-based VOC sensor shifted significantly downward during the toluene, octane and ethanol exposure. The resonant frequency was converted to I2C output signal by I2C-I/F and transmitted to receiver
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