Elaboration of porous silicon carbide by soft templating molecular precursors with semi-fluorinated alkanes
2015
Nardin, T. | Gouze, B. | Cambedouzou, J. | Bauduin, P. | Wong Chi Man, M. | Deschanels, X. | Bourgeois, D. | Meyer, D. | Diat, O.
We present a novel soft templating approach (STA) for the elaboration of porous silicon carbide (SiC) in oxygen- and moisture-free atmospheres. In this method, the molecular precursor, 1,3,5-trisilacyclohexane (TSCH) which is in a liquid state at room temperature, is templated by a solid network of semi-fluorinated alkanes (SFA) that self-assemble directly in the former liquid. The obtained gel phase is then converted into a polysilane by the polymerization of TSCH molecules around the solid network of SFA. In a next step, the SFA are washed out from the polysilane, and the latter material is converted into SiC by calcination under argon atmosphere at 1000 °C. The resulting material possesses a granular structure with a macroporosity. This study validates STA as a sustainable and promising method to obtain porous and mesoporous SiC.
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