Surface-Enhanced Resonance Raman Spectroscopy
Definition and meaning of Surface-Enhanced Resonance Raman Spectroscopy in chemistry.
Surface-Enhanced Resonance Raman Spectroscopy (SERRS) is a remarkably sensitive analytical technique that combines surface-enhanced Raman scattering with resonance Raman scattering to achieve massive overall signal amplification.
In more detail
By directly adsorbing a target analyte molecule onto a roughened metal surface or metallic nanoparticle, typically composed of silver or gold, the inherent Raman signal is electromagnetically enhanced by several orders of magnitude. Further massive enhancement is achieved by carefully tuning the excitation laser frequency to perfectly match an allowed electronic absorption transition of the target molecule. This synergistic dual enhancement mechanism allows for the reliable detection of analytes down to the single-molecule limit.
Key facts
| Field | Analytical Chemistry |
|---|---|
| Mechanism | Plasmonic and resonance enhancement |
| Sensitivity | Up to single-molecule detection |
SERRS is effectively used in forensic and environmental analysis to detect trace amounts of hazardous synthetic dyes or specific biological markers in complex mixtures with extreme sensitivity.
Frequently asked questions
What specific metals are most commonly used in SERRS active substrates?
Silver and gold nanoparticles are overwhelmingly preferred due to their highly favorable localized surface plasmon resonance properties in the visible and near-infrared light spectrum.