BaSnO 3 Thick Film as a Carbon Dioxide Sensor

Abstract

BaSnO 3 has been prepared as porous screen-printed thick films gas sensors. The sensor material was characterized by scanning electron microscopy and X-ray diffraction. The sensors gas response was investigated by exposure to varying concentrations of CO 2 gas in synthetic air and mixtures of CO and CO 2 all at a variety of different operating temperatures. Finally the gas response was examined to potential interferant gases including humidity. It was found that at an operating temperature of 500C and to a 2000 ppm pulse of CO 2 the sensors gave a gas response of 3.10, higher than current literature values for metal oxide materials. It was also found that increasing relative humidity enhanced the gas response in contrast to other approaches. © 2011 The Electrochemical Society.