BaSnO 3 Thick Film as a Carbon Dioxide Sensor

BaSnO3 has been prepared as porous screen-printed thick films gas sensors. The sensor material was characterised by scanning electron microscopy and X-ray diffraction. The sensors gas response was investigated by exposure to varying concentrations of CO2 gas in synthetic air and mixtures of CO and CO2 all at a variety of different operating temperatures. Finally the gas response was examined to potential intereferant gases including humidty. It was found that at an operating temperature of 500 °C and to a 2000 ppm pulse of CO2 the sensors gave a gas response of 3.10, higher than current literature values. It was also found that increasing relative humidity enhanced the gas response in contrast to other approaches.