Synergistic Effect of Surface Acidity and PtOx Catalyst on the Sensitivity of Nanosized Metal–Oxide Semiconductors to Benzene

Marikutsa, A.; Khmelevsky, N.; Rumyantseva, M.

Авторы: Marikutsa Artem, Khmelevsky Nikolay, Rumyantseva Marina
Журнал: Sensors
Том: 22
Номер: 17
Год издания: 2022
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 6520
DOI: 10.3390/s22176520
Аннотация: Benzene is a potentially carcinogenic volatile organic compound (VOC) and its vapor mustbe strictly monitored in air. Metal–oxide semiconductors (MOS) functionalized by catalytic noblemetals are promising materials for sensing VOC, but basic understanding of the relationships ofmaterials composition and sensors behavior should be improved. In this work, the sensitivity tobenzene was comparatively studied for nanocrystalline n-type MOS (ZnO, In2O3, SnO2, TiO2, andWO3) in pristine form and modified by catalytic PtOx nanoparticles. Active sites of materials wereanalyzed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed techniques usingprobe molecules. The sensing mechanism was studied by in situ diffuse-reflectance infrared (DRIFT)spectroscopy. Distinct trends were observed in the sensitivity to benzene for pristine MOS andnanocomposites MOS/PtOx. The higher sensitivity of pristine SnO2, TiO2, and WO3 was observed.This was attributed to higher total concentrations of oxidation sites and acid sites favoring targetmolecules’ adsorption and redox conversion at the surface of MOS. The sensitivity of PtOx􀀀modifiedsensors increased with the surface acidity of MOS and were superior for WO3/PtOx. It was deducedthat this was due to stabilization of reduced Pt sites which catalyze deep oxidation of benzenemolecules to carbonyl species.
Добавил в систему: Марикуца Артем Валерьевич

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Synergistic Effect of Surface Acidity and PtOx Catalyst on the Sensitivity of Nanosized Metal–Oxide Semiconductors to Benzeneстатья Исследовательская статья

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