Issue 39, 2011
From the journal:

Journal of Materials Chemistry

New topotactic synthetic route to mesoporous silicon carbide†

Peng-Cheng Gao,a   Yannick Lei,a   Andrès F. Cardozo Pérez,a   Khalil Rajoua,a   David Zitounb  and  Frédéric Favier*a  

* Corresponding authors

a Institut Charles Gerhardt Montpellier UMR 5253 CNRS, Université Montpellier 2, cc1502, Montpellier cedex 05, France
E-mail: fredf@um2.fr
Fax: +33 (0)4 67 14 33 04
Tel: +33 (04) 67 14 33 32

b Bar Ilan University, Department of Chemistry and Institute of Nanotechnology and Advanced Materials, Ramat Gan, Israel
E-mail: david.zitoun@biu.ac.il
Fax: +972 (0)3 738 40 53
Tel: +972 (0)3 738 45 12

Abstract

Mesoporous silicon carbide (SiC) was synthesized by a one-pot thermal reduction of SiO2/C composites by metallic Mg at the remarkably low temperature of 800 °C. Two distinct mesostructured silica were used as hard templates for composite preparation: a hexagonal 3D close-packed assembly of Stöber silica spheres and an ordered mesoporous SBA15 silica. In the latter case, SiC has crystallized in its 2H–SiC hexagonal phase, which is rather unique at such a low temperature. Composites were obtained by impregnation/polymerisation/carbonisation of a molecular carbon precursor within the porous structure of the silica template. After thermal treatment at a moderate temperature in the presence of Mg and subsequent by-products rinsing off, both prepared SiC showed distinct mesoporous structures related to the initial SiO2 architectures. By comparison of the mesoporous characteristics, resulting SiC was found to retain the carbon structures of the pristine composites. The description of the synthetic mechanism of this topotactic reaction contrasts with the usual assumption stating the templating role of silica.

Graphical abstract: New topotactic synthetic route to mesoporous silicon carbide

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Article information

DOI
https://doi.org/10.1039/C1JM12457A
Article type
Paper
Submitted
31 May 2011
Accepted
05 Aug 2011
First published
07 Sep 2011

J. Mater. Chem., 2011,21, 15798-15805

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New topotactic synthetic route to mesoporous silicon carbide

P. Gao, Y. Lei, A. F. Cardozo Pérez, K. Rajoua, D. Zitoun and F. Favier, J. Mater. Chem., 2011, 21, 15798 DOI: 10.1039/C1JM12457A

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