Dynamic surface enhanced Raman spectroscopy (SERS): extracting SERS from normal Raman scattering

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for molecular analysis.
• SERS can suffer from spectral interferences from solvents and instrumental artifacts.
• Analyzing heterogeneous adsorbate populations on SERS-active surfaces remains challenging.

Purpose of the Study:

• To demonstrate the benefits of dynamic surface-enhanced Raman spectroscopy (DSERS).
• To showcase DSERS's capability in removing spectral interferences.
• To highlight DSERS's application in site-selective spectroscopy of adsorbates.

Main Methods:

• Utilized dynamic surface-enhanced Raman spectroscopy (DSERS) measurements.
• Employed shelled nanoparticles to evaluate solvent spectral interference removal.
• Investigated 4-mercaptopyridine on gold nanoparticles for site-selective analysis.

Main Results:

• DSERS successfully removed strong solvent spectral interference in SERS measurements.
• Demonstrated site-selective spectroscopy, identifying a unique small population of 4-mercaptopyridine molecules.
• The DSERS spectrum revealed spectroscopic differences within adsorbate populations.

Conclusions:

• DSERS provides a significant advancement over traditional SERS.
• The technique effectively eliminates instrumental and solvent interferences.
• DSERS enables detailed analysis of unique molecular subpopulations on SERS-active surfaces.