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Surface-enhanced spectra on D-gluconic acid coated silver nanoparticles
Igor O Osorio-Román1, Victoria Ortega-Vásquez, Victor Vargas C
1Departamento de Quimica Inorganica, Facultad de Quimica, Pontificia Universidad Católica de Chile, Chile. iosorior@uc.cl
Applied Spectroscopy
|August 9, 2011
Summary
Surface-enhanced fluorescence (SEF) and SERRS of rhodamine B were observed on D-glucose-coated silver nanoparticles. The organic coating, identified as D-gluconic acid, influences enhancement factors and nanoparticle aggregation impacts SEF.
Area of Science:
- Plasmonics and Nanophotonics
- Spectroscopy
- Surface Chemistry
Background:
- Silver (Ag) nanostructures are known to enhance optical signals through plasmonic effects.
- Surface-enhanced fluorescence (SEF) and surface-enhanced resonance Raman scattering (SERRS) are powerful techniques for molecular analysis.
- Controlling the interface between metal nanoparticles and analytes is crucial for optimizing enhancement.
Purpose of the Study:
- To investigate surface-enhanced fluorescence (SEF) and surface-enhanced resonance Raman scattering (SERRS) of rhodamine B (RhB) on D-glucose-coated silver (Ag) nanostructures.
- To identify the organic coating formed during Ag colloid synthesis and its role in SEF/SERRS.
- To study the distance dependence of SEF and SERRS on these coated nanostructures.
Main Methods:
- Synthesis of coated Ag colloids using D-glucose.
- Identification of the organic coating using surface-enhanced Raman scattering (SERS).
- Experimental determination and modeling of fluorescence enhancement factors for RhB.
- Measurement of RhB fluorescence lifetime on coated Ag nanoparticles and glass surfaces.
Main Results:
- D-glucose-coated Ag nanostructures enabled observation of SEF and SERRS for rhodamine B.
- The organic coating was identified as D-gluconic acid via SERS.
- A modest fluorescence enhancement factor was observed due to short metal-fluorophore separation, with SEF overcoming energy transfer.
- Shorter fluorescence lifetime of RhB on coated Ag nanoparticles compared to glass supports plasmon enhancement.
- Nanoparticle aggregation was found to further increase the SEF enhancement factor.
Conclusions:
- D-gluconic acid coating on Ag nanoparticles allows for simultaneous observation of SEF and SERRS.
- The proximity of the fluorophore to the metal surface, mediated by the D-gluconic acid layer, is critical for observed enhancement.
- Aggregation of these coated nanoparticles can significantly boost SEF, offering potential for enhanced sensing applications.
