Abstract
Using a magnesiothermic reduction process, the successful conversion of hierarchically organized meso/macroporous silica monoliths to self-supporting macroporous silicon networks comprising interparticle mesoporosity has been demonstrated. By careful variation of reaction time and temperature, the final network structure can be controlled to a large degree. Scanning and transmission electron microscopy images indicate that the cellular silicon structure is built up from aggregated 1–15 nm sized crystalline silicon particles aggregated to struts that form macropores of approximately 2 µm diameter.
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Acknowledgments
This work has been financially supported by the Bundesministerium für Bildung und Forschung (BMBF) (project “KoLiWIn”/03SF0343C). Dr. J. Holzbock and M. Rapp are gratefully acknowledged for helpful discussions. We thank S. Blessing for XRD analysis (Ulm University) and Mubera Suljic for the nitrogen sorption measurements. We are also grateful to the Central Facility for Electron Microscopy (Ulm University) for TEM measurements.
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Waitzinger, M., Elsaesser, M.S., Berger, R.J.F. et al. Self-supporting hierarchically organized silicon networks via magnesiothermic reduction. Monatsh Chem 147, 269–278 (2016). https://doi.org/10.1007/s00706-015-1611-8
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DOI: https://doi.org/10.1007/s00706-015-1611-8