scholarly journals Experimental tests of surface‐enhanced Raman scattering: Moving beyond the electromagnetic enhancement theory

2020 ◽  
Author(s):  
Sebastian Heeg ◽  
Niclas S. Mueller ◽  
Sören Wasserroth ◽  
Patryk Kusch ◽  
Stephanie Reich
Keyword(s):  
Raman Scattering ◽  
Experimental Tests ◽  
Surface Enhanced Raman Scattering ◽  
Electromagnetic Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Molecular hot spots in surface-enhanced Raman scattering

Nanoscale ◽  
2020 ◽  
Vol 12 (43) ◽  
pp. 22036-22041
Author(s):  
Ming Li ◽  
Scott K. Cushing ◽  
Guangwen Zhou ◽  
Nianqiang Wu
Keyword(s):  
Raman Scattering ◽  
Hot Spots ◽  
Surface Enhanced Raman Scattering ◽  
Aromatic Molecules ◽  
Electromagnetic Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

This work reports that aromatic molecules adsorbed on the Au surface can create “molecular hot spots” for electromagnetic enhancement of surface-enhanced Raman scattering.

scholarly journals Quantification and coupling of the electromagnetic and chemical contributions in surface-enhanced Raman scattering

2019 ◽  
Vol 10 ◽  
pp. 549-556 ◽  
Author(s):  
Yarong Su ◽  
Yuanzhen Shi ◽  
Ping Wang ◽  
Jinglei Du ◽  
Markus B Raschke ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Field Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Chemical Effect ◽  
Electromagnetic Enhancement ◽  
Chemical Enhancement ◽  
Wide Range ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

In surface-enhanced Raman scattering (SERS), both chemical (CE) and electromagnetic (EM) field effects contribute to its overall enhancement. However, neither the quantification of their relative contributions nor the substrate dependence of the chemical effect have been well established. Moreover, there is to date no understanding of a possible coupling between both effects. Here we demonstrate how systematically engineered silver and gold planar and nanostructured substrates, covering a wide range of field enhancements, provide a way to determine relative contributions of chemical and electromagnetic field-enhancement in SERS measurements of benzenethiol. We find a chemical enhancement of 2 to 14 for different vibrational resonances when referencing against a vibrational mode that undergoes minimal CE. The values are independent of substrate type and independent of the enhancement of the electromagnetic intensity in the range from 1 to 106. This absence of correlation between chemical and electromagnetic enhancement resolves several long-standing controversies on substrate and intensity dependence of the chemical enhancement and allows for a more systematic design of SERS substrates with desired properties.

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