Preparation of luminescent Si nanoparticles by tailoring the size, crystallinity and surface composition
| Autor: | Mauro Falconieri, F. L. Fabbri, Valentina Bello, Rosaria D'Amato, Elisabetta Borsella |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Photoluminescence Nucleation Nanoparticle Sintering Bioengineering Nanotechnology General Chemistry Condensed Matter Physics Silane Atomic and Molecular Physics and Optics chemistry.chemical_compound Crystallinity chemistry Chemical engineering Dynamic light scattering Modeling and Simulation General Materials Science Luminescence |
| Zdroj: | Journal of Nanoparticle Research. 12:1845-1858 |
| ISSN: | 1572-896X 1388-0764 |
| Popis: | The preparation of sizeable quantities of luminescent Si nanoparticles (Si-np) with controlled morphology is a challenging task. Here, we describe two strategies aiming at size reduction of the Si-np produced in a laser-assisted silane pyrolysis reactor without detrimental effects on the process yield and on the nanoparticle structural and compositional properties. The first method is based on the addition of a sensitizer gas to dilute silane and consequently reduce the nucleation centres density without decreasing the reaction temperature. The second consists in the introduction of a collector at a variable distance from the irradiated region to freeze the particle growth and decrease the inter-particle sintering probability. We report on the characterization of the produced Si-np, and we show that by combining the two methods, we are able to prepare 4 nm crystalline core size nanoparticles with a productivity of 1 g per hour. We also describe the enhancement effect of the wet-chemical oxidation processes on the luminescence emission intensity of the Si-np. |
| Databáze: | OpenAIRE |
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