Journal
NANO LETTERS
Volume 7, Issue 11, Pages 3535-3539Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl0723376
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We present an instrument for performing correlation spectroscopy on single fluorescent particles while tracking their Brownian motion in three dimensions using real-time feedback. By tracking CdSe/ZnS quantum dots in water (diffusion coefficient similar to 20 mu m(2)/s), we make the first measurements of photon antibunching (at similar to 10 ns) on single fluorophores free in solution and find fluorescence lifetime heterogeneity within a quantum dot sample. In addition, we show that 2-mercaptoethanol suppresses short time-scale intermittency (1 ms to 1 s) in quantum dot fluorescence by reducing time spent in the off-state.
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