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- W2049372280 endingPage "1632" @default.
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- W2049372280 abstract "SnO2 is a suitable base material for chemical sensors. Its sensitivity against reducing gases can be improved and adjusted by doping with noble metals. We studied diffusion processes and stabilities of impurities and the most important dopant Pd both, under oxidizing and reducing conditions at various temperatures by means of XPS, UPS, and ISS. Besides small amounts of Na and Cl, the main bulk acceptor-type impurity is Fe. It shows reversible in and out diffusion around 870 K strongly influenced by oxygen. From XPS core level shifts we deduce the low temperature metallic dopant Pd to form Pd2+ O at the SnO2 surface after oxidation. Above 670 K we observe diffusion of Pd2+ into the bulk. Under reducing uhv conditions and upon H2 exposure the reduction from surface Pd2+ O to Pd0 is driven by the thermodynamic instability of PdO." @default.
- W2049372280 created "2016-06-24" @default.
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- W2049372280 date "1990-01-01" @default.
- W2049372280 modified "2023-09-23" @default.
- W2049372280 title "Surface spectroscopic studies on Pd-doped SnO2" @default.
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- W2049372280 doi "https://doi.org/10.1016/0042-207x(90)94037-q" @default.
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