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

摘要

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 Ti02 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 BaSn03. 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.