Efficient Fabrication of Nanoporous Si and Si/Ge Enabled by a Heat Scavenger in Magnesiothermic Reactions Public Deposited

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  • Magnesiothermic reduction can directly convert SiO₂ into Si nanostructures. Despite intense efforts, efficient fabrication of highly nanoporous silicon by Mg still remains a significant challenge due to the exothermic reaction nature. By employing table salt (NaCl) as a heat scavenger for the magnesiothermic reduction, we demonstrate an effective route to convert diatom (SiO₂) and SiO₂/GeO₂ into nanoporous Si and Si/Ge composite, respectively. Fusion of NaCl during the reaction consumes a large amount of heat that otherwise collapses the nano-porosity of products and agglomerates silicon domains into large crystals. Our methodology is potentially competitive for a practical production of nanoporous Si-based materials.
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  • Luo, W., Wang, X., Meyers, C., Wannenmacher, N., Sirisaksoontorn, W., Lerner, M. M., & Ji, X. (2013). Efficient fabrication of nanoporous si and si/ge enabled by a heat scavenger in magnesiothermic reactions. Scientific Reports, 3, 2222. doi:10.1038/srep02222
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