1. New topotactic synthetic route to mesoporous silicon carbide
- Author
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Khalil Rajoua, Pengcheng Gao, David Zitoun, Frédéric Favier, Andrès F. Cardozo Pérez, Yannick Lei, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Institute of Nanotechnology and Advanced Materials, and Bar-Ilan University [Israël]
- Subjects
Materials science ,Composite number ,Hexagonal phase ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Thermal treatment ,[CHIM.MATE]Chemical Sciences/Material chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Mesoporous organosilica ,chemistry ,Polymerization ,Chemical engineering ,Materials Chemistry ,Silicon carbide ,0210 nano-technology ,Mesoporous material ,Carbon ,ComputingMilieux_MISCELLANEOUS - 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 Stober 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.
- Published
- 2011