Morphology, structural properties and reducibility of size-selected CeO2-x nanoparticle films

Maria Chiara Spadaro, Sergio D'Addato, Gabriele Gasperi, Francesco Benedetti, Paola Luches, Vincenzo Grillo, Giovanni Bertoni, Sergio Valeri

Research output: Contribution to journalArticle

Abstract

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 O2 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.

Original languageEnglish
Pages (from-to)60-67
Number of pages8
JournalBeilstein Journal of Nanotechnology
Volume6
Issue number1
DOIs
Publication statusPublished - 2015

Fingerprint

Structural properties
Nanoparticles
nanoparticles
Cerium compounds
Agglomeration
fluid filters
cycles
High resolution transmission electron microscopy
atomic structure
gas flow
Flow of gases
X ray photoelectron spectroscopy
quadrupoles
Gases
Heat treatment
photoelectron spectroscopy
Vacuum
tubes
atmospheres
Oxidation

Keywords

  • CeOultra-thin films
  • Ceria nanoparticles
  • Magnetron sputtering
  • Reduction and oxidation
  • Size-dependent properties
  • Size-selected nanoparticles
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering
  • Physics and Astronomy(all)

Cite this

Morphology, structural properties and reducibility of size-selected CeO2-x nanoparticle films. / Spadaro, Maria Chiara; D'Addato, Sergio; Gasperi, Gabriele; Benedetti, Francesco; Luches, Paola; Grillo, Vincenzo; Bertoni, Giovanni; Valeri, Sergio.

In: Beilstein Journal of Nanotechnology, Vol. 6, No. 1, 2015, p. 60-67.

Research output: Contribution to journalArticle

Spadaro, MC, D'Addato, S, Gasperi, G, Benedetti, F, Luches, P, Grillo, V, Bertoni, G & Valeri, S 2015, 'Morphology, structural properties and reducibility of size-selected CeO2-x nanoparticle films', Beilstein Journal of Nanotechnology, vol. 6, no. 1, pp. 60-67. https://doi.org/10.3762/bjnano.6.7
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 CeO2-x nanoparticle films. In: Beilstein Journal of Nanotechnology. 2015 ; Vol. 6, No. 1. pp. 60-67.
@article{736e40e24eba4d2e831e58b07c3d0acf,
title = "Morphology, structural properties and reducibility of size-selected CeO2-x nanoparticle films",
abstract = "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 O2 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.",
keywords = "CeOultra-thin films, Ceria nanoparticles, Magnetron sputtering, Reduction and oxidation, Size-dependent properties, Size-selected nanoparticles, X-ray photoelectron spectroscopy",
author = "Spadaro, {Maria Chiara} and Sergio D'Addato and Gabriele Gasperi and Francesco Benedetti and Paola Luches and Vincenzo Grillo and Giovanni Bertoni and Sergio Valeri",
year = "2015",
doi = "10.3762/bjnano.6.7",
language = "English",
volume = "6",
pages = "60--67",
journal = "Beilstein Journal of Nanotechnology",
issn = "2190-4286",
publisher = "Beilstein-Institut Zur Forderung der Chemischen Wissenschaften",
number = "1",

}

TY - JOUR

T1 - Morphology, structural properties and reducibility of size-selected CeO2-x nanoparticle films

AU - Spadaro, Maria Chiara

AU - D'Addato, Sergio

AU - Gasperi, Gabriele

AU - Benedetti, Francesco

AU - Luches, Paola

AU - Grillo, Vincenzo

AU - Bertoni, Giovanni

AU - Valeri, Sergio

PY - 2015

Y1 - 2015

N2 - 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 O2 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.

AB - 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 O2 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.

KW - CeOultra-thin films

KW - Ceria nanoparticles

KW - Magnetron sputtering

KW - Reduction and oxidation

KW - Size-dependent properties

KW - Size-selected nanoparticles

KW - X-ray photoelectron spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=84923084244&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84923084244&partnerID=8YFLogxK

U2 - 10.3762/bjnano.6.7

DO - 10.3762/bjnano.6.7

M3 - Article

AN - SCOPUS:84923084244

VL - 6

SP - 60

EP - 67

JO - Beilstein Journal of Nanotechnology

JF - Beilstein Journal of Nanotechnology

SN - 2190-4286

IS - 1

ER -