Ozone detection in air using SmFeO3 gas sensor

The conductance changes of SmFeO3 based p-type gas sensor with ozone in air with and without VOCs were examined. The conductance for this sensor was responsible in sub-ppm levels ozone at the temperatures above 240 degrees C and the sensitivity decreased with an increase in the working temperature. It is expected that the sensitivity in 0.01 ppm ozone estimated to be ca. 10 at 290 degrees C. The sensing characteristic is promising to monitor the environmental air quality regarding with ozone. The conductance for ozone was decreased by the contamination of same levels VOCs. This is mainly due to the decrease in actual concentration of ozone by the reaction with contaminated VOCs. The developed sensor is a very promising candidate for the detection of ozone in sub-ppm levels and for the contaminated levels with several VOCs in monitoring environment. (c) 2004 Elsevier B.V. All rights reserved.