QUANTITATIVE OZONE MEASUREMENT USING A PHTHALOCYANINE THIN-FILM SENSOR AND DYNAMIC SIGNAL EVALUATION

Increased public concern about pollution and the resulting health haza rds has led to growing interest in the monitoring of ozone in ambient air. High ozone concentrations in cities due to photochemical smog or in offices due to photocopiers and laser-printers lead to an increased demand for reliable, easy to use ozone monitors. We propose a measure ment and evaluation method for ozone using a copper phthalocyanine (Cu Pc) thin-film sensor as the detecting element. Satisfying reproducibil ity and a long lifetime of the sensor are achieved through dynamic eva luation of the sensor resistance by switching between clean and sample air. Good accuracy (<5%) and a large operating range (10-5000 ppb) ca n be achieved with this technique.