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• W2763942034 abstract "The redox performance of CeO2 - x nanocrystals (nanoceria) is always accompanied by the switching of cerium oxidation state between Ce3+ and Ce4+. We monitored Ce3+ → Ce4+ oxidation of nanoceria stimulated by oxidant in aqueous colloidal solutions controlling the luminescence of Ce3+ ions located at different distances from nanoceria surface. The observed Ce3+ luminescence changes indicate that Ce3+ → Ce4+ reaction develops inside nanoceria being triggered by the diffusing oxygen originated from the water splitting on oxidized nanoceria surface. We present the first observation of the pronounced oscillations of Ce3+ luminescence intensity arising from Ce3+ ↔ Ce4+ reversible switching. This threshold effect is to be driven by uptaking and releasing oxygen by nanoceria, when the concentration of oxygen vacancies in nanoceria lattice, oxidant concentration in colloidal solution, and temperature reach certain critical values. So, the ability of nanoceria to uptake and release oxygen depending on the environmental redox conditions really makes it the self-sufficient eternal antioxidant." @default.
• W2763942034 created "2017-10-20" @default.
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• W2763942034 date "2017-10-13" @default.
• W2763942034 modified "2023-09-27" @default.
• W2763942034 title "Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO2 − x )" @default.
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• W2763942034 doi "https://doi.org/10.1186/s11671-017-2339-7" @default.
• W2763942034 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5640564" @default.
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• W2763942034 hasPublicationYear "2017" @default.
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