Nanoparticle-free single molecule anti-stokes Raman spectroscopy |
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Authors: | Peyser-Capadona Lynn Capadona Lynn Peyser Zheng Jie González Jose I Lee Tae-Hee Patel Sandeep A Dickson Robert M |
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Institution: | School of Chemistry and Biochemistry, Georgia Institute of Technology Atlanta, Georgia 30332-0400, USA. |
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Abstract: | In the absence of large, plasmon-supporting nanoparticles, biocompatible dendrimer- and peptide-encapsulated few-atom Ag nanoclusters produce scaffold-specific single molecule (SM) Stokes and anti-Stokes Raman scattering. The strong SM vibrational signatures are enhanced by the Agn transitions in nanoparticle-free samples and cannot arise from plasmon enhancement. Characteristic SM-Raman intermittency is observed, with antibunching of the underlying Agn emission directly confirming the SM nature of the emissive species. |
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