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Optical properties of femtosecond laser-synthesized silicon nanoparticles in deionized water

  Articoli su Riviste JCR/ISI  (anno 2011)

Autori:  Intartaglia R., Bagga K., Brandi F., Das G., Genovese A., Di Fabrizio E., Diaspro A

Affiliazione Autori:  Italian Institute of Technology (IIT), via Morego 30, 16152 Genoa, Italy; BIONEM Lab, University Magna Graecia, Viale Europa Catanzaro, Italy

Riassunto:  Silicon nanoparticles were prepared by ultrafast laser ablation of a silicon target in deionized water. The nanoparticles were characterized by using optical absorption, Raman spectroscopy, and transmission electron microscopy. The mean size is found to vary from 60 to 2.5 nm in the absence of any reducing chemical reagents, decreasing the pulse energy value. High-resolution transmission electron microscopy together with Raman spectroscopy confirms the crystalline structure of the generated silicon nanoparticles. The energy confinement of carriers which is evaluated from optical experiments varies from 90 to 550 meV when the mean nanoparticles size decreases from 60 to 2.5 nm. In particular, the evaluated nanoparticle sizes from optical analysis and the 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 present stability studies which show that the smallest nanoparticles aggregate over time.

Rivista/Giornale:  JOURNAL OF PHYSICAL CHEMISTRY C
Volume n.:  115 (12)      Pagine da: 5102  a: 5107
Ulteriori informazioni:  This work was supported by the Italian Institute of Technology. The authors gratefully acknowledge the technical help of Marco Scotto d\'Abbusco.
DOI: 10.1021/jp109351t

*Impact Factor della Rivista: (2011) 4.805   *Citazioni: 69
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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