Single fluorescent gold nanoclusters

C. T. Yuan, Wu-Ching Chou, J. Tang, C. A. Lin, W. H. Chang, J. L. Shen, D. S. Chuu

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Both ensemble and single-molecule measurements were performed to explore the fluorescence properties of Au nanoclusters (NCs). Photoinduced fluorescence enhancement was observed for ensemble NCs in solution, but photobleaching was found at ambient environments. At the single-molecule level, fluorescence blinking and single-step photobleaching were observed. Furthermore, their time-resolved fluorescence shows a single exponential decay with a lifetime of ~7 ns and is insensitive to changes in fluorescence intensity. The lifetime distribution is more homogeneous within ensemble Au NCs as compared to CdSe QDs. Therefore, Au NCs have potential applications as nontoxic fluorescent labels for lifetime-based imaging microscopy. However, their low quantum yields and poor photostability are disadvantageous factors, which require further improvement.

Original languageEnglish
Pages (from-to)16111-16118
Number of pages8
JournalOptics Express
Issue number18
StatePublished - 31 Aug 2009

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