D’Amato, Rosaria and Falconieri, Mauro and Fabbri, Fabio and Bello, Valentina and Borsella, Elisabetta (2010) Preparation of luminescent Si nanoparticles by tailoring the size, crystallinity and surface composition. Journal of Nanoparticle Research, 12 (5). pp. 1845-1858.
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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.
|Uncontrolled Keywords:||Silicon nanoparticles - Oxidation - Photoluminescence - Dynamic light scattering - X-ray diffraction - TEM - Synthesis - Light emitters|
|Subjects:||Material Science > Nanofabrication processes and tools|
|Deposited On:||08 Jun 2010 17:46|
|Last Modified:||08 Jun 2010 17:46|
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