Ultra-sensitivity and stable detection of H2S based on Gd doped NiO: The synergy of increased surface-adsorbed oxygen and a pseudo-heterojunction effect

Mesoporous nanoflakes with high surface area of Gd doped NiO were investigated for gas sensing application. At near room temperature, it is challenging for a hydrogen sulfide (H2S) gas sensor to produce good response. A high gas response was thought to be possible with morphologies that have a large specific surface area and ideal porosity. The augmented impact of metal cation doping on NiO's H2S-sensitive characteristics was discussed. Herein, cubic NiO doped with Gd was synthesised using hydrothermal process. When compared to pure NiO, the 1 mol% Gd-doped NiO nanoflakes demonstrated better gas sensing capabilities on the basis of the data obtained. The sensor exhibited significant performance and produced an excellent gas response at an operating temperature of 50 °C. Considering the excellent response of the sensor, Gd doping into NiO nanoflakes must be a viable way to build high performance gas sensor.