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

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

Risultato della ricerca: Article

9 Citazioni (Scopus)

Abstract

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.
Lingua originaleEnglish
pagine (da-a)024303-1-024303-6
Numero di pagine6
RivistaJournal of Applied Physics
Volume120
Stato di pubblicazionePublished - 2016

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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