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Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films

Non-stoichiometric ceria nanoparticles (NPs) were obtained by a gas aggregation source with a magnetron and were mass-selected with a quadrupole mass filter. By varying magnetron power, Ar gas flow, and the length of the aggregation tube, NPs with an average diameter of 6, 9, and 14 nm were synthesi...

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Autores principales: Spadaro, Maria Chiara, D’Addato, Sergio, Gasperi, Gabriele, Benedetti, Francesco, Luches, Paola, Grillo, Vincenzo, Bertoni, Giovanni, Valeri, Sergio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Beilstein-Institut 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4311585/
https://www.ncbi.nlm.nih.gov/pubmed/25671152
http://dx.doi.org/10.3762/bjnano.6.7
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author Spadaro, Maria Chiara
D’Addato, Sergio
Gasperi, Gabriele
Benedetti, Francesco
Luches, Paola
Grillo, Vincenzo
Bertoni, Giovanni
Valeri, Sergio
author_facet Spadaro, Maria Chiara
D’Addato, Sergio
Gasperi, Gabriele
Benedetti, Francesco
Luches, Paola
Grillo, Vincenzo
Bertoni, Giovanni
Valeri, Sergio
author_sort Spadaro, Maria Chiara
collection PubMed
description Non-stoichiometric ceria nanoparticles (NPs) were obtained by a gas aggregation source with a magnetron and were mass-selected with a quadrupole mass filter. By varying magnetron power, Ar gas flow, and the length of the aggregation tube, NPs with an average diameter of 6, 9, and 14 nm were synthesized and deposited onto a substrate, thus obtaining NP films. The morphology of the films was studied with scanning electron microscopy, while high resolution transmission electron microscopy was used to gain a deeper insight into the atomic structure of individual NPs. By using X-ray photoelectron spectroscopy we analyzed the degree of reduction of the NPs of different diameters, before and after thermal treatments in vacuum (reduction cycle) and in O(2) atmosphere (oxidation cycle) at different temperatures. From this analysis we inferred that the size is an important parameter only at intermediate temperatures. As a comparison, we evaluated the reducibility of an ultra-thin ceria film with the same surface to volume ratio as the 9 nm diameter NPs film, observing that NPs are more reducible than the ceria film.
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spelling pubmed-43115852015-02-10 Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films Spadaro, Maria Chiara D’Addato, Sergio Gasperi, Gabriele Benedetti, Francesco Luches, Paola Grillo, Vincenzo Bertoni, Giovanni Valeri, Sergio Beilstein J Nanotechnol Full Research Paper Non-stoichiometric ceria nanoparticles (NPs) were obtained by a gas aggregation source with a magnetron and were mass-selected with a quadrupole mass filter. By varying magnetron power, Ar gas flow, and the length of the aggregation tube, NPs with an average diameter of 6, 9, and 14 nm were synthesized and deposited onto a substrate, thus obtaining NP films. The morphology of the films was studied with scanning electron microscopy, while high resolution transmission electron microscopy was used to gain a deeper insight into the atomic structure of individual NPs. By using X-ray photoelectron spectroscopy we analyzed the degree of reduction of the NPs of different diameters, before and after thermal treatments in vacuum (reduction cycle) and in O(2) atmosphere (oxidation cycle) at different temperatures. From this analysis we inferred that the size is an important parameter only at intermediate temperatures. As a comparison, we evaluated the reducibility of an ultra-thin ceria film with the same surface to volume ratio as the 9 nm diameter NPs film, observing that NPs are more reducible than the ceria film. Beilstein-Institut 2015-01-07 /pmc/articles/PMC4311585/ /pubmed/25671152 http://dx.doi.org/10.3762/bjnano.6.7 Text en Copyright © 2015, Spadaro et al. https://creativecommons.org/licenses/by/2.0https://www.beilstein-journals.org/bjnano/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Nanotechnology terms and conditions: (https://www.beilstein-journals.org/bjnano/terms)
spellingShingle Full Research Paper
Spadaro, Maria Chiara
D’Addato, Sergio
Gasperi, Gabriele
Benedetti, Francesco
Luches, Paola
Grillo, Vincenzo
Bertoni, Giovanni
Valeri, Sergio
Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films
title Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films
title_full Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films
title_fullStr Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films
title_full_unstemmed Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films
title_short Morphology, structural properties and reducibility of size-selected CeO(2−)(x) nanoparticle films
title_sort morphology, structural properties and reducibility of size-selected ceo(2−)(x) nanoparticle films
topic Full Research Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4311585/
https://www.ncbi.nlm.nih.gov/pubmed/25671152
http://dx.doi.org/10.3762/bjnano.6.7
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