Prtljaga N, D'Amato E, Pitanti A, Guider R, Froner E, Larcheri S, Scarpa M, Pavesi L. Photoluminescence of hydrophilic silicon nanocrystals in aqueous solutions.
NANOTECHNOLOGY 2011;
22:215704. [PMID:
21451237 DOI:
10.1088/0957-4484/22/21/215704]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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.
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