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Nanotechnology. 2013 Feb 22;24(7):075703. doi: 10.1088/0957-4484/24/7/075703. Epub 2013 Jan 28.

Enhanced luminescence of Ag nanoclusters via surface modification.

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Leiden University Medical Center, Interventional Molecular Imaging Laboratory, Department of Radiology, Leiden, The Netherlands.


In this work we present a detailed study on the influence of surface modifications for luminescent silver (Ag) clusters. Ag clusters (25 atoms) capped with dihydrolipoic acid show a distinct absorbance spectrum with several sharp transitions, and relative broad deep red luminescence with a quantum yield of 5% combined with a remarkably long luminescence lifetime of ~3 μs at room temperature. Both pH and the presence of coordinating ligands influence the absorbance spectra and fluorescence intensity. A strong increase in luminescence intensity up to 45% quantum yield could be induced by coordination with PEG ligands.


the surface coordination of the Ag clusters strongly influences the optical properties.

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