Abstract
The application of a non-stationary regime of temperature modulation in metal oxide semiconductor sensor based on SnO2–Ag leads not only to a strongly increased sensor response, but also to a considerably improved sensor selectivity toward hydrogen sulfide. Selectivity with respect to other reducing gases (CO, NH3, H2) is about five orders of magnitude, enabling a correct selective determination of H2S in the presence of interfering gas components.
Highlights
Hydrogen sulfide H2 S is a heavy, colorless gas with high corrosivity and flammability.Hydrogen sulfide is a highly hazardous chemical with a characteristic foul odor
In [47], we showed that non-stationary temperature regimes increase the selectivity of MOX sensors to hydrogen sulfide
The composition and nanostructure of SnO2 powder shave been characterized by Xray diffraction (XRD), transmission electron microscopy (TEM) [47], X-ray photoelectron spectroscopy (XPS) and X-ray near-edge absorption spectroscopy (XANES) [48]
Summary
Hydrogen sulfide H2 S is a heavy, colorless gas with high corrosivity and flammability.Hydrogen sulfide is a highly hazardous chemical with a characteristic foul odor. Semiconductor sensors show more selectivity in detecting hydrogen sulfide compared to other gases This is related to the features of the sorption process of H2 S on the surface of metal oxide semiconductors, which can cause reversible conversion of some oxides to sulfides with a higher level of electrical conductivity or with a different type of conductivity. This process can contribute in a very important way to the sensor response. The additives of copper (+2) change the phase composition of the gas-sensitive layer when adsorbing hydrogen sulfide [3,4]
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