Pure and Cupricated BaSnO 3 thick film resistor: Synthesis, Characterization and studies on its gas sensing performance

摘要

In this work we report the synthesis, microstructure, electric properties and sensingperformance of BaSnO 3 (BS) powder, it was prepared by mechano-chemical method. As preparedpowder is calcinated at temperatures 1100 o C, and 1300 o C tested for crystallization. Thick films wereprepared using simple screen-printing technology. Structural and electrical analyses were performedand the results have been correlated. The material was tested for various gases such as CO, CO2 , NH 3 ,Cl 2 , H 2 , LPG, ethanol, and H 2 S. The pure BS film shows good response multiple gases at variousoperating temperature up to 500 0 C as NH 3 , CO 2 , CO, ethanol and, H 2 S for different gas concentrations,when the pure film is surface modified with aqueous solution of Cucl 2 using simple dipping techniquefor various time intervals (5 min., 10 min., 20 min. and, 30 min.), film improves the selectivity andsensitivity. Maximum response (S=36.2) was found to H 2 S gas at temperature of 250 0 C and S=12.1 forethanol at 500o C for gas concentration of 50 ppm with film dipped for 10 min. time interval. Thecharacterization of the films was done by XRD, SEM and TG-DTA. Crystallite size, texture coefficient,specific surface area, electric properties and gas sensitivity of the films were measured and presented.