Mixed Ion and Electron Conducting Ceramics for Gas Sensors

Abstract

A conventional solid-state synthetic route was used to prepare a mixed conducting double perovskite-type Ba2Ca0.66Nb0.68Fe0.66O6-δ (BCNF66). FTIR study was performed to confirm the chemical stability under 1% CO2, whereas the cross-sectional SEM image was employed to investigate the morphology of the sensor. A comparative study on BCNF66 with and without CO2 in dry synthetic air along with O2 effect was carried out. The significant effect of O2 was observed when CO2 was passed through the sensor in N2. The O2 in dry synthetic air was found to stabilize the CO2 sensor response (current). Furthermore, the addition of ppm level of CO2 in dry synthetic air increased the response.