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Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))

The redox performance of CeO(2 − x) nanocrystals (nanoceria) is always accompanied by the switching of cerium oxidation state between Ce(3+) and Ce(4+). We monitored Ce(3+) → Ce(4+) oxidation of nanoceria stimulated by oxidant in aqueous colloidal solutions controlling the luminescence of Ce(3+) ion...

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Autores principales: Malyukin, Yuri, Klochkov, Vladimir, Maksimchuk, Pavel, Seminko, Vladyslav, Spivak, Nikolai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5640564/
https://www.ncbi.nlm.nih.gov/pubmed/29030776
http://dx.doi.org/10.1186/s11671-017-2339-7
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author Malyukin, Yuri
Klochkov, Vladimir
Maksimchuk, Pavel
Seminko, Vladyslav
Spivak, Nikolai
author_facet Malyukin, Yuri
Klochkov, Vladimir
Maksimchuk, Pavel
Seminko, Vladyslav
Spivak, Nikolai
author_sort Malyukin, Yuri
collection PubMed
description The redox performance of CeO(2 − x) nanocrystals (nanoceria) is always accompanied by the switching of cerium oxidation state between Ce(3+) and Ce(4+). We monitored Ce(3+) → Ce(4+) oxidation of nanoceria stimulated by oxidant in aqueous colloidal solutions controlling the luminescence of Ce(3+) ions located at different distances from nanoceria surface. The observed Ce(3+) luminescence changes indicate that Ce(3+) → Ce(4+) 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 Ce(3+) luminescence intensity arising from Ce(3+) ↔ Ce(4+) 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. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s11671-017-2339-7) contains supplementary material, which is available to authorized users.
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spelling pubmed-56405642017-10-30 Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x)) Malyukin, Yuri Klochkov, Vladimir Maksimchuk, Pavel Seminko, Vladyslav Spivak, Nikolai Nanoscale Res Lett Nano Express The redox performance of CeO(2 − x) nanocrystals (nanoceria) is always accompanied by the switching of cerium oxidation state between Ce(3+) and Ce(4+). We monitored Ce(3+) → Ce(4+) oxidation of nanoceria stimulated by oxidant in aqueous colloidal solutions controlling the luminescence of Ce(3+) ions located at different distances from nanoceria surface. The observed Ce(3+) luminescence changes indicate that Ce(3+) → Ce(4+) 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 Ce(3+) luminescence intensity arising from Ce(3+) ↔ Ce(4+) 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. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s11671-017-2339-7) contains supplementary material, which is available to authorized users. Springer US 2017-10-13 /pmc/articles/PMC5640564/ /pubmed/29030776 http://dx.doi.org/10.1186/s11671-017-2339-7 Text en © The Author(s). 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Malyukin, Yuri
Klochkov, Vladimir
Maksimchuk, Pavel
Seminko, Vladyslav
Spivak, Nikolai
Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))
title Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))
title_full Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))
title_fullStr Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))
title_full_unstemmed Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))
title_short Oscillations of Cerium Oxidation State Driven by Oxygen Diffusion in Colloidal Nanoceria (CeO(2 − x))
title_sort oscillations of cerium oxidation state driven by oxygen diffusion in colloidal nanoceria (ceo(2 − x))
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5640564/
https://www.ncbi.nlm.nih.gov/pubmed/29030776
http://dx.doi.org/10.1186/s11671-017-2339-7
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