A novel limiting current oxygen sensor prepared by slurry spin coating

Abstract La 0.7 Sr 0.3 MnO 3 (LSM) and Y 0.08 Zr 0.92 O 2 (8YSZ) were synthesized by citric-nitrate and co-precipitation methods, respectively. Crystal structure and conductivity of the samples were characterized by X-ray diffraction (XRD) and DC van der Pauw measurements, respectively. A limiting current oxygen sensor was fabricated with 8YSZ solid electrolyte and LSM dense diffusion barrier by a slurry spin coating method. The process parameters and sensing performances were investigated. Results: LSM is perovskite structure. The total conductivity of LSM is 104.95–162.18 S·cm −1 from 300 to 800 °C. The obtained optimum process parameters of slurry spin coating are: ethyl cellulose content of 3 wt%, coating cycle number of 7 and sintering temperature of 1400 °C. The sensor exhibits a good limiting current plateau that depends linearly on the oxygen concentration, and exponentially on the reciprocal temperature.