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Proceedings Paper

Optical characterization of silicon nanoparticle obtained via femtosecond laser ablation in deionized water
Author(s): R. Intartaglia; K. Bagga; F. Brandi; G. Das; A. Genovese; E. Di Fabrizio; A. Diaspro
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Paper Abstract

We reported the synthesis of silicon nanoparticles with mean size varying from 60 nm to 3 nm, by ultrafast laser ablation of a silicon target in deionized water. Optical absorption, Raman spectroscopy and Electron microscopy were performed to characterize the nanoparticles. The crystalline structure of the obtained silicon nanoparticles was confirmed with Raman spectroscopy combined with High resolution transmission electronic microscopy. The energy confinement of carriers which is evaluated from optical experiments varies from 90 meV to 440 meV when the mean nanoparticles size decreases from 60 nm to 3 nm. In particular, the evaluated nanoparticles size from optical analysis and LCAO theoretical model are found in agreement with Transmission Electron Microscopy and Raman measurements for the silicon nanoparticles with a size less than 6 nm. Finally, we studied the stability of silicon nanoparticles with time which demonstrates that the smallest nanoparticle aggregates over time.

Paper Details

Date Published: 5 April 2011
PDF: 7 pages
Proc. SPIE 7922, Synthesis and Photonics of Nanoscale Materials VIII, 79220P (5 April 2011); doi: 10.1117/12.882079
Show Author Affiliations
R. Intartaglia, Istituto Italiano di Tecnologia (Italy)
K. Bagga, Istituto Italiano di Tecnologia (Italy)
F. Brandi, Istituto Italiano di Tecnologia (Italy)
G. Das, Istituto Italiano di Tecnologia (Italy)
A. Genovese, Istituto Italiano di Tecnologia (Italy)
E. Di Fabrizio, Istituto Italiano di Tecnologia (Italy)
A. Diaspro, Istituto Italiano di Tecnologia (Italy)

Published in SPIE Proceedings Vol. 7922:
Synthesis and Photonics of Nanoscale Materials VIII
David B. Geohegan; Jan J. Dubowski; Frank Träger, Editor(s)

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