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Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications

The plasma-based aerosol process developed for the direct coating of particles in gases with silicon oxide in a continuous chemical vapor deposition (CVD) process is presented. It is shown that non-thermal plasma filaments induced in a dielectric barrier discharge (DBD) at atmospheric pressure trigg...

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Autores principales: Post, Patrick, Jidenko, Nicolas, Weber, Alfred P., Borra, Jean-Pascal
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5302507/
https://www.ncbi.nlm.nih.gov/pubmed/28335219
http://dx.doi.org/10.3390/nano6050091
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author Post, Patrick
Jidenko, Nicolas
Weber, Alfred P.
Borra, Jean-Pascal
author_facet Post, Patrick
Jidenko, Nicolas
Weber, Alfred P.
Borra, Jean-Pascal
author_sort Post, Patrick
collection PubMed
description The plasma-based aerosol process developed for the direct coating of particles in gases with silicon oxide in a continuous chemical vapor deposition (CVD) process is presented. It is shown that non-thermal plasma filaments induced in a dielectric barrier discharge (DBD) at atmospheric pressure trigger post-DBD gas phase reactions. DBD operating conditions are first scanned to produce ozone and dinitrogen pentoxide. In the selected conditions, these plasma species react with gaseous tetraethyl orthosilicate (TEOS) precursor downstream of the DBD. The gaseous intermediates then condense on the surface of nanoparticles and self-reactions lead to homogeneous solid SiO(x) coatings, with thickness from nanometer to micrometer. This confirms the interest of post-DBD injection of the organo-silicon precursor to achieve stable production of actives species with subsequent controlled thickness of SiO(x) coatings. SiO(x) coatings of spherical and agglomerated metal and metal oxide nanoparticles (Pt, CuO, TiO(2)) are achieved. In the selected DBD operating conditions, the thickness of homogeneous nanometer sized coatings of spherical nanoparticles depends on the reaction duration and on the precursor concentration. For agglomerates, operating conditions can be tuned to cover preferentially the interparticle contact zones between primary particles, shifting the sintering of platinum agglomerates to much higher temperatures than the usual sintering temperature. Potential applications for enhanced thermal stability and tunable photoactivity of coated agglomerates are presented.
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spelling pubmed-53025072017-03-21 Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications Post, Patrick Jidenko, Nicolas Weber, Alfred P. Borra, Jean-Pascal Nanomaterials (Basel) Article The plasma-based aerosol process developed for the direct coating of particles in gases with silicon oxide in a continuous chemical vapor deposition (CVD) process is presented. It is shown that non-thermal plasma filaments induced in a dielectric barrier discharge (DBD) at atmospheric pressure trigger post-DBD gas phase reactions. DBD operating conditions are first scanned to produce ozone and dinitrogen pentoxide. In the selected conditions, these plasma species react with gaseous tetraethyl orthosilicate (TEOS) precursor downstream of the DBD. The gaseous intermediates then condense on the surface of nanoparticles and self-reactions lead to homogeneous solid SiO(x) coatings, with thickness from nanometer to micrometer. This confirms the interest of post-DBD injection of the organo-silicon precursor to achieve stable production of actives species with subsequent controlled thickness of SiO(x) coatings. SiO(x) coatings of spherical and agglomerated metal and metal oxide nanoparticles (Pt, CuO, TiO(2)) are achieved. In the selected DBD operating conditions, the thickness of homogeneous nanometer sized coatings of spherical nanoparticles depends on the reaction duration and on the precursor concentration. For agglomerates, operating conditions can be tuned to cover preferentially the interparticle contact zones between primary particles, shifting the sintering of platinum agglomerates to much higher temperatures than the usual sintering temperature. Potential applications for enhanced thermal stability and tunable photoactivity of coated agglomerates are presented. MDPI 2016-05-13 /pmc/articles/PMC5302507/ /pubmed/28335219 http://dx.doi.org/10.3390/nano6050091 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Post, Patrick
Jidenko, Nicolas
Weber, Alfred P.
Borra, Jean-Pascal
Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications
title Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications
title_full Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications
title_fullStr Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications
title_full_unstemmed Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications
title_short Post-Plasma SiO(x) Coatings of Metal and Metal Oxide Nanoparticles for Enhanced Thermal Stability and Tunable Photoactivity Applications
title_sort post-plasma sio(x) coatings of metal and metal oxide nanoparticles for enhanced thermal stability and tunable photoactivity applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5302507/
https://www.ncbi.nlm.nih.gov/pubmed/28335219
http://dx.doi.org/10.3390/nano6050091
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