Enhanced luminescence of Ag nanoclusters via surface modification

P.T.K. Chin, Marte van der Linden, E.J. van Harten, A. Barendregt, M.T.M. Rood, A.J. Koster, F.W.B. van Leeuwen, C. de Mello Donega, A.J.R. Heck, A. Meijerink

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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. Conclusion: the surface coordination of the Ag clusters strongly influences the optical properties.
Original languageEnglish
Article number075703
JournalNanotechnology
Volume24
Issue number7
DOIs
Publication statusPublished - 2013

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