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Influence of organic solvent on optical and structural properties of ultra-small silicon dots synthesized by UV laser ablation in liquid

  Articoli su Riviste JCR/ISI  (anno 2012)

Autori:  Intartaglia R., Bagga K., Genovese A., Athanassiou A., Cingolani R., Diaspro A., Brandi F

Affiliazione Autori:  Nanophysics, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy; Nanochemistry, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy; Center for Biomolecular Nanotechnologies UniLe, Istituto Italiano di Tecnologia, via Barsanti, 73010 Arnesano Lecce, Italy

Riassunto:  Ultra small silicon nanoparticles (Si-NPs) with narrow size distribution are prepared in a one step process by UV picosecond laser ablation of silicon bulk in liquid. Characterization by electron microscopy and absorption spectroscopy proves Si-NPs generation with an average size of 2 nm resulting from an in situ photofragmentation effect. In this context, the current work aims to explore the liquid medium (water and toluene) effect on the Si-NPs structure and on the optical properties of the colloidal solution. Si-NPs with high pressure structure (s.g. Fm3m) and diamond-like structure (s.g. Fd3m), in water, and SiC moissanite 3C phase (s.g. F (4) over bar 3m) in toluene are revealed by the means of High-Resolution TEM and HAADF-STEM measurements. Optical investigations show that water-synthesized Si-NPs have blue-green photoluminescence emission characterized by signal modulation at a frequency of 673 cm-1 related to electron-phonon coupling. The synthesis in toluene leads to generation of Si-NPs embedded in the graphitic carbon-polymer composite which has intrinsic optical properties at the origin of the optical absorption and luminescence of the obtained colloidal solution.

Rivista/Giornale:  PHYSICAL CHEMISTRY CHEMICAL PHYSICS (PRINT)
Volume n.:  14 (44)      Pagine da: 15406  a: 15411
DOI: 10.1039/c2cp42195j

*Impact Factor della Rivista: (2012) 3.829   *Citazioni: 27
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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