A Novel H2S Gas Sensor Applied to the Construction Workers During the Construction Process

As a kind of colorless, highly toxic, flammable and explosive gas, hydrogen sulfide overflows in this relatively closed space during tunnel construction, which has great safety risk. In current paper, hierarchical NiO porous spheres were successfully prepared through a facile hydrothermal approach, and moreover, NiO spheres with smooth surface were also synthesized hydrothermally as comparison study. The results indicated that the nanosheet-constructed NiO porous spheres exhibited an enhanced H2S gas-sensing property than that of the conventional smooth one, which may benefit from their numerous reaction spaces for surface sensing interaction between the adsorbed oxygen species and H2S gas molecules as well as sufficient pathways for gas diffusion associated with such porous structure.