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Silicon carbide with tunable ordered mesoporosity

Gao, Peng-Cheng and Simon, Patrice and Favier, Frédéric Silicon carbide with tunable ordered mesoporosity. (2013) Microporous and Mesoporous Materials , 180. 172-177. ISSN 1387-1811

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Official URL: http://dx.doi.org/10.1016/j.micromeso.2013.06.027

Abstract

Tunable mesoporous silicon carbides (SiCs) are synthesized by magnesio-thermal reduction of homogeneous composites of silica and carbon precursors. Two triblock copolymers, P123 and F127, are used as structuring agents leading to composites showing an hexagonal mesoporous pattern which is kept by the final SiC thanks to the relatively low temperature of the magnesio-thermal reduction. Two series of mesoporous SiCs are obtained with uniform pore sizes ranging from 6.0 nm to 2.5 nm (P123 used as structuring agent) and 11.0–3.5 nm (F127) depending on the carbon/silica molar ratio in the pristine composite. In each series, SiC polytype transforms from 6H–SiC to 3C–SiC in pace of increasing the carbon content in the composite precursor. A multi step growth mechanism is proposed to account for the composite precursor to final carbide characteristics.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Microporous and Mesoporous Materials website : http://www.sciencedirect.com/science/journal/13871811
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Montpellier 1 (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
Other partners > Réseau de stockage électrochimique de l’énergie - Energie RS2E (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:15 Apr 2014 10:09

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