In Situ Identification of Spherical Ag Monomers and Dimers at Zeptomole Adsorbate Concentrations by Surface-Enhanced Raman Scattering Correlation Spectroscopy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS Omega Année : 2019

In Situ Identification of Spherical Ag Monomers and Dimers at Zeptomole Adsorbate Concentrations by Surface-Enhanced Raman Scattering Correlation Spectroscopy

Aude Barbara
Fabien Dubois
Pascal Quemerais

Résumé

We have developed a bright optical setup especially optimized for surface enhanced Raman scattering correlation spectroscopy. We show that the brightness of the experiment combined with the correlation approach permits in situ access to the size and shape of the SERS-active aggregates in solution despite a very weak SERS signal of the adsorbed molecules. As a result we demonstrate that dimers and larger SERS-active aggregates can be identified through the temporal fluctuations of the SERS signal of only a few hundred of adsorbed molecules i.e at zeptomole adsorbate concentrations. Monomers covered by a monolayer of MBA were also identified. These results open a way for single nanoparticle sensing, for single molecule SERS-active aggregate characterization or for quantitative monitoring of functionalization processes on metallic objects.
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Dates et versions

hal-02001180 , version 1 (31-01-2019)

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Aude Barbara, Fabien Dubois, Pascal Quemerais. In Situ Identification of Spherical Ag Monomers and Dimers at Zeptomole Adsorbate Concentrations by Surface-Enhanced Raman Scattering Correlation Spectroscopy. ACS Omega, 2019, 4 (1), pp.2283-2290. ⟨10.1021/acsomega.8b03512⟩. ⟨hal-02001180⟩

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