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Growing CeO\(_2\) Nanoparticles within the Nano-Porous Architecture of the SiO\(_2\) Aerogel

Caddeo, Francesco, Loche, Danilo, Casula, Maria F., Corrias, Anna (2020) Growing CeO\(_2\) Nanoparticles within the Nano-Porous Architecture of the SiO\(_2\) Aerogel. Frontiers in Chemistry: Nanoscience, . ISSN 2296-2646. (doi:10.3389/fchem.2020.00057)

Abstract

In this study, new CeO\(_2\)-SiO\(_2\) aerogel nanocomposites obtained by controlled growth of CeO\(_2\) nanoparticles within the highly porous matrix of a SiO\(_2\) aerogel are presented. The nanocomposites have been synthesized via a sol-gel route, employing cerium (III) nitrate as the CeO\(_2\) precursor and selected capping agents to control the growth of the CeO\(_2\) nanoparticles, which occurs during the supercritical drying of the aerogels. Samples with different loading of the CeO\(_2\) dispersed phase, ranging from 5 to 15%, were obtained. The nanocomposites showed the morphological features typical of the SiO\(_2\) aerogels such as open mesoporosity with surface area values up to 430 m\(^2\)·g\(^{-1}\). TEM and XRD characterizations show that nanocrystals of the dispersed CeO\(_2\) nanophase grow within the aerogel already during the supercritical drying process, with particle sizes in the range of 3 to 5 nm. TEM in particular shows that the CeO\(_2\) nanoparticles are well distributed within the aerogel matrix. We also demonstrate the stability of the nanocomposites under high temperature conditions, performing thermal treatments in air at 450 and 900°C. Interestingly, the CeO\(_2\) nanoparticles undergo a very limited crystal growth, with sizes up to only 7 nm in the case of the sample subjected to a 900°C treatment.

Item Type: Article
DOI/Identification number: 10.3389/fchem.2020.00057
Uncontrolled keywords: ceria, aerogel, nanoporous materials, nanocomposites, surfactants
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Anna Corrias
Date Deposited: 17 Jan 2020 12:31 UTC
Last Modified: 17 Feb 2020 12:06 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/79603 (The current URI for this page, for reference purposes)
Corrias, Anna: https://orcid.org/0000-0002-5190-8196
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