Preparation of luminescent Si nanoparticles by tailoring the size,crystallinity and surface composition |
| |
Authors: | Rosaria D’Amato Mauro Falconieri Fabio Fabbri Valentina Bello and Elisabetta Borsella |
| |
Institution: | 1.ENEA C. R. Frascati,Frascati, Roma,Italy;2.ENEA C. R. Casaccia,Rome,Italy;3.Dipartimento di Fisica, INFM,Università di Padova,Padova,Italy |
| |
Abstract: | 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|