期刊
NANOTECHNOLOGY
卷 24, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/24/7/075703
关键词
-
资金
- division of Chemical Sciences (CW) of the Dutch Science Foundation (NWO) [VENI 722.011.005]
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 similar to 3 mu s 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. Conclusion: the surface coordination of the Ag clusters strongly influences the optical properties.
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