Cargando…
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...
Autores principales: | , , , , , , , |
---|---|
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 |
_version_ | 1782355019328126976 |
---|---|
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. |
format | Online Article Text |
id | pubmed-4311585 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT spadaromariachiara morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT daddatosergio morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT gasperigabriele morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT benedettifrancesco morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT luchespaola morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT grillovincenzo morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT bertonigiovanni morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms AT valerisergio morphologystructuralpropertiesandreducibilityofsizeselectedceo2xnanoparticlefilms |