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Journal of Nanoparticle Research
Erschienen in: Journal of Nanoparticle Research 1/2010

01.01.2010 | Special focus: Safety of Nanoparticles

Effect of water and UV passivation on the luminescence of suspensions of silicon quantum dots

verfasst von: J. Vincent, V. Maurice, X. Paquez, O. Sublemontier, Y. Leconte, O. Guillois, C. Reynaud, N. Herlin-Boime, O. Raccurt, F. Tardif

Erschienen in: Journal of Nanoparticle Research | Ausgabe 1/2010

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Abstract

This article presents the evolution of the photo-luminescence (PL) of silicon quantum dots (QDs) with an average diameter of 5–6 nm dispersed in alcohol under different conditions. Two samples were considered after alcohol dispersion: freshly synthesized (kept in air for 2 days) QDs which do not exhibit luminescence and air-aged (kept in air for 2 years) QDs exhibiting red-IR luminescence. Experiments performed with addition of a small volume of water, followed by heating for different times showed that the oxidation occurs gradually until transforming totally the initial material in SiO2. The oxidation process does not enable the appearance of PL from the Si core for dispersed non-aged powders, while it results in a blue shift of the PL maximum intensity for the aged ones. The results obtained after UV illumination clearly indicate an effect of the UV irradiation on the luminescence of QDs dispersed in aqueous environment, and the treatments with acidic water lead to the conclusion of a possible enhancement of the PL by hydrogen passivation of the non-radiative defects. This result should be taken into account for post-production treatments and applications, more particularly, considering a controlled and safe use of luminescent Si QDs.
Vorheriger Artikel Monitor for detecting and assessing exposure to airborne nanoparticles
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Metadaten
Titel
Effect of water and UV passivation on the luminescence of suspensions of silicon quantum dots
verfasst von
J. Vincent
V. Maurice
X. Paquez
O. Sublemontier
Y. Leconte
O. Guillois
C. Reynaud
N. Herlin-Boime
O. Raccurt
F. Tardif
Publikationsdatum
01.01.2010
Verlag
Springer Netherlands
Erschienen in
Journal of Nanoparticle Research / Ausgabe 1/2010
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-009-9708-9

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