A NEW CARBON-MONOXIDE SENSOR USING A POLYPYRROLE FILM GROWN ON AN INTERDIGITAL-CAPACITOR SUBSTRATE

A new gas sensor using a polypyrrole film grown on the surface of an i nterdigitated-capacitor substrate was proposed for the detection of ca rbon monoxide (GO). An experimental set-up was established and the pro perties of the sensor and the responses to different temperatures, gas flow rates, and CO concentration were measured and discussed. The max imal sensitivity (Delta R/R-0) for this sensor at 500 ppm CO concentra tion reached 6.5% and could be consistently reproduced. (C) 1997 Elsev ier Science S.A.