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|Title:||Single-molecule surface-enhanced (resonance) raman scattering (SE(R)RS) as a probe for metal colloid aggregation state|
|Author:||dos Santos, Diego P.|
Temperini, Marcia L. A.
Brolo, Alexandre G.
|Abstract:||Single-molecule surface-enhanced (resonance) Raman scattering (SM-SE(R)RS) studies have applications beyond analytical chemistry. For instance, SM-SERS spectra carry information about the molecule interaction with the hotspots (regions of strong electric field enhancement due to surface plasmon resonance). The analysis of the time- (or spatial-) dependent fluctuations in SM-SERS spectra permits, for instance, the study of resonance contributions from the local electric field to imbalances in the anti-Stokes to Stokes intensity ratios (I-AS/I-S). This analysis is a tool for the characterization of the resonance energies of the hotspots. In the case of colloidal samples, the structures of the hotspots and their properties are dependent upon the colloidal aggregation state. The analysis Of the I-AS/I-S ratios in such a system can be a useful characterization tool to infer the hotspot structures for different aggregation states. In this work, the distributions of I-AS/I-S ratio for crystal violet (CV) adsorbed in Ag colloids at different aggregation states was studied under SM-SERS conditions. The experimental results were interpreted in terms of the generalized Mie theory (GMT) simulations|
Nanoestruturas de carbono
|Editor:||American Chemical Society|
|Appears in Collections:||IQ - Artigos e Outros Documentos|
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