Perspectives for usage of adsorption semiconductor sensors based on Pd/SnO ₂ in environmental monitoring of carbon monoxide and methane emission

摘要

Nanosized semiconductor sensor materials based on SnO_(2)with different palladium contents were obtained via zol-gel technology with the use of ethylene glycol and hydrate of tin (VI) chloride as precursors. Morphology and phase composition of nanosized sensor materials were studied by X-ray diffraction and TEM methods. Catalytic activities of the Pd/SnO_(2)nanomaterials in the reaction of H_(2)and CO oxidation were investigated. Adsorption semiconductor sensors based on Pd/SnO_(2)nanomaterials were made by their calcination up to 620~(0)C in air and the sensors were found to be highly sensitive to presence of CO and CH_(4)in air ambient. Higher responses to CO of Pd-containing sensors in comparison with their responses to CH_(4)were confirmed by higher reaction activity of CO in catalytic oxidation reaction. Differences in sensitive properties of the sensors to methane and carbon monoxide were explained by features of the catalytic reactions of methane and carbon monoxide oxidation occurring on surfaces of the gas sensitive layers of the sensors.