Photoluminescence of hydrophilic silicon nanocrystals in aqueous solutions
Authors:
- Nikola PrtljagaNPNikola Prtljaga
- Elvira D’amatoEDElvira D’amato
- Alessandro PitantiAPAlessandro Pitanti
- Romain GuiderRGRomain Guider
- Elena FronerEFElena Froner
- Silvia LarcheriSLSilvia Larcheri
- Marina ScarpaMSMarina Scarpa
- Lorenzo PavesiLorenzo Pavesi
- 31 March 2011
- journal article
- Published by IOP Publishing in Nanotechnology
- Vol. 22 (21) , 215704
Abstract
Stable aqueous solutions of undecylenic-acid-grafted silicon nanocrystals (Si-nc) were prepared. The time evolution of the photoluminescence properties of these hydrophilic silicon nanocrystals has been followed on different timescales (hours and days). On a short timescale (hours), Si-nc tend to agglomerate while the PL lineshape and intensity are stable. Agglomeration can be reduced by using suitable surfactants. On a long timescale (days), oxidation of Si-nc occurs even in the presence of surfactants. These two observations render Si-nc very useful as a labeling agent for biosensing.Keywords
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