Single-molecule SERS detection of C60
Literature Information
Single-molecule Surface-Enhanced Raman Scattering (SERS) detection of buckminsterfullerene (C60) is achieved by using different isotopologues of the molecule with a distribution around an average isotopic substitution (12C → 13C) of ∼30%. The distribution of different isotopologues creates a broad (∼20 cm−1) average SERS signal within which single-molecule SERS spectra of individual isotopic realizations of the molecule can be distinguished. The SERS enhancement factors for SM-SERS C60 events are typically in the range of ∼108, suggesting a limitation imposed by either photobleaching or surface interactions with the (Ag) metallic colloids to reach the highest SERS hot-spots (which can typically have larger maximum enhancements). SM-SERS signals of isotopically substituted C60 also show broader peaks (FWHM ≈ 4 cm−1) than equivalent signals in natural C60. The latter feature suggests a contribution to the homogeneous broadening coming from isotopic disorder in the molecule; a feature that can only be observed with the ability to detect single-molecule spectra.
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