scholarly journals Electrochemical Control of the Time-Dependent Intensity Fluctuations in Surface-Enhanced Raman Scattering (SERS)

2009 ◽  
Vol 113 (41) ◽  
pp. 17737-17744 ◽  
Author(s):  
Diego P. dos Santos ◽  
Gustavo F. S. Andrade ◽  
Marcia L. A. Temperini ◽  
Alexandre G. Brolo
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Time Dependent ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Electrochemical Control ◽  
Enhanced Raman Scattering ◽  
Intensity Fluctuations

High-Speed Fluctuations in Surface-Enhanced Raman Scattering Intensities from Various Nanostructures

2020 ◽  
Vol 74 (11) ◽  
pp. 1398-1406
Author(s):  
Ariadne T. Bido ◽  
Britta G. Nordberg ◽  
Marit A. Engevik ◽  
Nathan C. Lindquist ◽  
Alexandre G. Brolo
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
High Speed ◽  
Surface Enhanced Raman Scattering ◽  
Strength Distribution ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Intensity Fluctuations ◽  
Sers Intensity

The observation of single molecule events using surface-enhanced Raman scattering (SERS) is a well-established phenomenon. These events are characterized by strong fluctuations in SERS intensities. High-speed SERS intensity fluctuations (in the microsecond time scale) have been reported for experiments involving single metallic particles. In this work, the high-speed SERS behavior of six different types of nanostructured metal systems (Ag nanoshells, Ag nanostars, Ag aggregated spheres, Au aggregated spheres, particle-on-mirror, and Ag deposited on microspheres) was investigated. All systems demonstrated high-speed SERS intensity fluctuations. Statistical analysis of the duration of the SERS fluctuations yielded tailed distributions with average event durations around 100 μs. Although the characteristics of the fluctuations seem to be random, the results suggest interesting differences between the system that might be associated with the strength distribution and density of the localized SERS hotspots. For instance, systems with more localized fields, such as nanostars, present faster fluctuation bursts compared to metallic aggregates that support spread-out fields. The results presented here appear to confirm that high-speed SERS intensity fluctuations are a fundamental characteristic of the SERS effect.

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