Self-limiting and complete oxidation of silicon nanostructures produced by laser ablation in water

Lavinia Vaccaro, Marco Cannas, Franco Mario Gelardi, Fabrizio Messina, Dagmar Gerthsen, Radian Popescu, Schneider, Pietro Camarda

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10 Citations (Scopus)


Oxidized Silicon nanomaterials produced by 1064 nm pulsed laser ablation in deionized water are investigated. High-resolution transmission electron microscopy coupled with energy dispersive X-ray spectroscopy allows to characterize the structural and chemical properties at a sub-nanometric scale. This analysis clarifies that laser ablation induces both self-limiting and complete oxidation processes which produce polycrystalline Si surrounded by a layer of SiO2 and amorphous fully oxidized SiO2, respectively. These nanostructures exhibit a composite luminescence spectrum which is investigated by time-resolved spectroscopy with a tunable laser excitation. The origin of the observed luminescence bands agrees with the two structural typologies: Si nanocrystals emit a μs-decaying red band; defects of SiO2 give rise to a ns-decaying UV band and two overlapping blue bands with lifetime in the ns and ms timescale.
Original languageEnglish
Pages (from-to)024303-1-024303-6
Number of pages6
JournalJournal of Applied Physics
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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