Synthesis and properties of silicon/magnesium silicon nitride diatom frustule replicas
| Autor: | Gabriella Tranell, Arne Røyset, Ivar Andre Ødegård, Julien Clement Romann, Anita Fossdal |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Silicon biology Frustule Renewable Energy Sustainability and the Environment Nanoporous Nanocrystalline silicon chemistry.chemical_element Nanotechnology General Chemistry biology.organism_classification chemistry.chemical_compound Diatom Silicon nitride chemistry Chemical engineering Transmittance General Materials Science Luminescence |
| Zdroj: | J. Mater. Chem. A. 2:16410-16415 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | The elaboration of nanostructures including both functional materials and functional morphology is a crucial scientific and technological challenge. In this work diatom frustule replicas mainly consisting of magnesium silicon nitride and nanocrystalline silicon have been obtained by simultaneous metallothermic reduction and nitriding of silica diatom frustules at 800 °C. The frustule replicas retained most of the complex nanoporous structures from the original frustules in the conversion. The optical scattering, transmittance and luminescence properties of the replicas have been investigated. Luminescence was observed and attributed to the presence of silicon nanocrystals. Wavelength dependent diffraction of light was observed in bio-silica frustules but not in frustule replicas, this was attributed to surface coarsening of the replicas during reaction. Light transmittance was found to be lower in frustule replicas and was consistent with absorption of light by Si nanocrystals. |
| Databáze: | OpenAIRE |
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