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Sensors (Basel)

Title:		Synergistic Effect of Surface Acidity and PtO(x) Catalyst on the Sensitivity of Nanosized Metal-Oxide Semiconductors to Benzene
Author(s):		Marikutsa A; Khmelevsky N; Rumyantseva M;
Address:		"Chemistry Department, Moscow State University, Vorobyovy Gory 1-3, 119234 Moscow, Russia. LISM, Moscow State Technological University Stankin, Vadkovsky Ln. 1, 127055 Moscow, Russia"
Journal Title:		Sensors (Basel)
Year:		2022
Volume:		20220829
Issue:		17
Page Number:		-
DOI:		10.3390/s22176520
ISSN/ISBN:		1424-8220 (Electronic) 1424-8220 (Linking)
Abstract:		"Benzene is a potentially carcinogenic volatile organic compound (VOC) and its vapor must be strictly monitored in air. Metal-oxide semiconductors (MOS) functionalized by catalytic noble metals are promising materials for sensing VOC, but basic understanding of the relationships of materials composition and sensors behavior should be improved. In this work, the sensitivity to benzene was comparatively studied for nanocrystalline n-type MOS (ZnO, In(2)O(3), SnO(2), TiO(2), and WO(3)) in pristine form and modified by catalytic PtO(x) nanoparticles. Active sites of materials were analyzed by X-ray photoelectron spectroscopy (XPS) and temperature-programmed techniques using probe 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 and nanocomposites MOS/PtO(x). The higher sensitivity of pristine SnO(2), TiO(2), and WO(3) was observed. This was attributed to higher total concentrations of oxidation sites and acid sites favoring target molecules' adsorption and redox conversion at the surface of MOS. The sensitivity of PtO(x)-modified sensors increased with the surface acidity of MOS and were superior for WO(3)/PtO(x). It was deduced that this was due to stabilization of reduced Pt sites which catalyze deep oxidation of benzene molecules to carbonyl species"
Keywords:		active sites benzene gas sensor platinum semiconductor metal oxides supported noble metal catalyst;
Notes:		"PubMed-not-MEDLINEMarikutsa, Artem Khmelevsky, Nikolay Rumyantseva, Marina eng 22-73-10038/Russian Science Foundation/ Switzerland 2022/09/10 Sensors (Basel). 2022 Aug 29; 22(17):6520. doi: 10.3390/s22176520"