Synthesis, characterization and performance of pure and surface modified BaSnO3 with Ti02 thick film resistor as a gas sensor

In this paper we report the synthesis, microstructure, electric properties and gas sensing performance of perovskite material of the form BaSnO₃ powder in form of a thick film resistor, Said powder was prepared by mechano-chemical method. Thick films were prepared by simple screen-printing method. The films were surface modified by TiO₂ by dipping technique. The characterization of the films was done by XRD, SEM and TGA. Peaks of the XRD pattern reveal the formation of compound BaSnO₃. Crystallite size, electric properties and gas sensitivity of the films were measured and presented here. Pure film was found to respond presence of CO₂ at elevated temperature of about 400°C, whereas when films are surface modified, response gets shifted to H₂S at lower temperature of about 300°C.