Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 4, Pages 1944-1948Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp054732v
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A method is proposed to pin down unambiguous proof for single-molecule sensitivity in surface enhanced Raman spectroscopy (SERS). The simultaneous use of two analyte molecules enables a clear confirmation of the single (or few)-molecule nature of the signals. This method eliminates most of the uncertainties associated with low dye concentrations in previous experiments. It further shows that single- or few-molecule signals are very common in SERS, both in liquids and on dry substrates.
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