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Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
Published on: May 12, 2023
Quantitative electrochemical SERS of flavin at a structured silver surface
Mamdouh Abdelsalam1, Philip N Bartlett, Andrea E Russell
1School of Chemistry, University of Southampton, Southampton, SO17 1BJ, UK.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 10, 2008
Summary
This study demonstrates surface enhanced Raman spectroscopy (SERS) for immobilized flavin analogues on nanostructured silver surfaces. Stable and reproducible enhancements were achieved, even when the flavin was not in direct contact with the silver.
Area of Science:
- Electrochemistry
- Spectroscopy
- Materials Science
Background:
- Flavin analogues are crucial in biological redox processes.
- Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity for molecular detection.
- Nanostructured metal surfaces enhance Raman signals significantly.
Purpose of the Study:
- To investigate in situ electrochemical SERS of immobilized flavin analogues on nanostructured silver.
- To explore the use of chemically linked flavins for SERS analysis.
- To characterize the electrochemical behavior of flavins using SERS.
Main Methods:
- Fabrication of nanostructured silver surfaces using electrodeposition through colloidal templates.
- Immobilization of a flavin analogue (isoalloxazine) via a cysteamine linker.
- In situ electrochemical SERS measurements at 633 nm excitation.
- Analysis of SERS spectra as a function of electrode potential.
Main Results:
- Strong SERS enhancements were observed for flavin analogues immobilized on nanostructured silver, despite indirect surface contact.
- Sphere segment void (SSV) structured silver surfaces proved suitable for stable and reproducible electrochemical SERS.
- The SERS technique demonstrated sensitivity to subfemtomole quantities of immobilized flavin.
- Electrochemical SERS studies provided evidence for flavin semiquinone formation at cathodic potentials.
Conclusions:
- Chemically linking flavins to nanostructured surfaces enables sensitive electrochemical SERS analysis.
- SSV silver surfaces are effective platforms for in situ electrochemical SERS studies.
- Electrochemical SERS can monitor redox transformations of immobilized flavins.
