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Surface characterization and properties of ordered arrays of CeO2 nanoparticles embedded in thin layers of SiO2

Chane-Ching, Jean-Yves and Airiau, Marc and Sahibed-Dine, Abdelaziz and Daturi, Marco and Brendlé, Eric and Ozil, Fabien and Thorel, Alain and Corma, Avelino Surface characterization and properties of ordered arrays of CeO2 nanoparticles embedded in thin layers of SiO2. (2005) Langmuir, vol. 21 (n° 4). pp. 1568-1574. ISSN 1520-5827

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Official URL: http://dx.doi.org/10.1021/la048201u

Abstract

We demonstrated the surface composite character down to the nanometer scale of SiO2-CeO2 composite high surface area materials, prepared using 5 nm colloidal CeO2 nanoparticle building blocks. These materials are made of a homogeneous distribution of CeO2 nanoparticles in thin layers of SiO2, arranged in a hexagonal symmetry as shown by small-angle X-ray scattering and transmission electron microscopy. Since the preparation route of these composite materials was selected in order to produce SiO2 wall thickness in the range of the CeO2 nanoparticle diameter, these materials display surface nanorugosity as shown by inverse chromatography. Accessibility through the porous volume to the functional CeO2 nanoparticle surfaceswasevidenced throughanorganic acid chemisorption technique allowing quantitative determination of CeO2 surface ratio. This surface composite nanostructure down to the nanometer scale does not affect the fundamental properties of the functional CeO2 nanodomains, such as their oxygen storage capacity, but modifies the acid-base properties of the CeO2 surface nanodomains as evidenced by Fourier transform IR technique. These arrays of accessible CeO2 nanoparticles displaying high surface area and high thermal stability, along with the possibility of tuning their acid base properties, will exhibit potentialities for catalysis, sensors, etc.

Item Type:Article
Additional Information:Thanks to American Chemical Society editor. The definitive version is available at http://pubs.acs.org/ The original PDF of the article can be found at Langmuir website : http://pubs.acs.org/doi/abs/10.1021/la048201u
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Consejo Superior de Investigaciones Científicas - CSIC (SPAIN)
Other partners > ENSICAEN (FRANCE)
Other partners > Rhodia (FRANCE)
Other partners > Adscientis (FRANCE)
Other partners > Mines ParisTech (FRANCE)
Other partners > Universidad Politecnica de Valencia (SPAIN)
Other partners > Université Chouaib Doukkali (MOROCCO)
Laboratory name:
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Deposited By: Nihad Lahdifi
Deposited On:28 Jan 2011 14:07

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