Abstract
Porous silicon microparticles have been prepared from SiO 2 + αMg ( α is mole number of Mg) exothermic mixture by solid flame synthesis method. Two interconnected strategies were followed to initiate morphology changes of as-produced silicon particles, namely changing the concentration of Mg in 0.75–2.0 mol range, and leaching of the combustion products with hydrochloric and/or hydrofluoric acids. The effects of synthesis conditions and chemical treatment procedure on product morphology and composition were evaluated using scanning electron microscopy and X-ray diffraction analysis. Porous silicon microparticles with uniform network structure and pore size distribution ranging from 0.1 to 1.5 μm were prepared after acid treatment of final combustion product. A comprehensive model for pore formation is proposed and discussed in context to the combustion temperature.
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