Unidentified H2 gas sensing characteristics of BaTiO3:Cu composition

A systematic evaluation of the gas sensing properties of Cu-modified BaTiO3 pellets for CO, H2 and LPG gases was carried out in the present investigation. The concentration of Cu in BaTiO3 was varied systematically from 1 to 11 wt.%. The highest value of sensitivity factor (SF) of 1388 for H2 and 557 for CO gases was obtained at considerably lower optimum operating temperatures of 180 and 250 °C respectively for 9 wt.% of Cu concentration. The sensor tends to saturate at 5.0 and 3.5% for H2 and CO gases respectively. The XRD and SEM characterization techniques were employed to understand the possible reasons for the high performance of the sensor material with 9 wt.% of Cu. The study revealed that this sensor material shows extraordinarily promising properties for H2 gas sensing application.