SURFACE ACOUSTIC-WAVE GAS SENSOR FOR NITROGEN-DIOXIDE USING PHTHALOCYANINES AS CHEMICAL INTERFACES - EFFECTS OF NITRIC-OXIDE, HALOGEN GASES, AND PROLONGED HEAT-TREATMENT

The effect of Co, NO, and O//2 on the response of a SAW (surface acoustic wave) chemosensor for NO//2 has been studied. A description is given of the measuring equipment existing of a mass flow controlled automatic gas dilution system. Copper and iron phthalocyanine were used as the chemical interface. Simultaneously, the influence of ambient atmospheres (N//2 and O//2) was investigated. Predictions from ultraviolet-visible experiments in solution do not hold for gaseous environments. All results are discussed in terms of general performance criteria for gas sensors such as selectivity, sensitivity, response time, reversibility, and stability.