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

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https://ir.library.oregonstate.edu/concern/articles/9880vr643

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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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  • We thank Oregon State University for the financial supports for this work. We appreciate thehelp from Teresa Sawyer, Dr. Peter Eschbach and Joshua Razink for their kind help in TEMmeasurements in OSU EM Facility, funded by National Science Foundation, MurdockCharitable Trust and OregonNanoscience andMicrotechnologies Institute, and CAMCOREM Facility.
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  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-09-04T22:23:35Z (GMT) No. of bitstreams: 2 license_rdf: 1536 bytes, checksum: df76b173e7954a20718100d078b240a8 (MD5) LuoWeiChemistryEfficientFabricationNanoporous.pdf: 3579826 bytes, checksum: c82f936ef43e03b2c31c95957e5003a7 (MD5)
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  • description.provenance : Made available in DSpace on 2013-09-04T22:23:35Z (GMT). No. of bitstreams: 2 license_rdf: 1536 bytes, checksum: df76b173e7954a20718100d078b240a8 (MD5) LuoWeiChemistryEfficientFabricationNanoporous.pdf: 3579826 bytes, checksum: c82f936ef43e03b2c31c95957e5003a7 (MD5) Previous issue date: 2013-07-17

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