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Author Spotlight: Advancing SERS Technology: Au@Carbon Dot Nanoprobes for Label-Free Analysis and Imaging

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Simultaneous SERS and surface-enhanced fluorescence from dye-embedded metal core-shell nanoparticles.

Yan Zhou¹, Peng Zhang

¹Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221, USA. peng.zhang@uc.edu.

Physical Chemistry Chemical Physics : PCCP

|April 4, 2014

Summary

Researchers developed a method for creating gold-core-silver-shell nanoparticles with simultaneous surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF). Dye molecules embedded between layers enable dual optical activities.

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Correlative Light- and Electron Microscopy Using Quantum Dot Nanoparticles

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Published on: August 7, 2016

Area of Science:

Nanotechnology
Materials Science
Spectroscopy

Background:

Surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF) are powerful spectroscopic techniques.
Developing nanostructures that exhibit both SERS and SEF simultaneously is challenging.
Controlling the spatial arrangement of functional molecules within nanostructures is crucial for optimizing optical properties.

Purpose of the Study:

To demonstrate a novel methodology for preparing Au-core-Ag-shell nanoparticles.
To achieve simultaneous SERS and SEF activities in a single nanostructure.
To investigate the role of polyelectrolyte layers in controlling dye molecule integration and optical response.

Main Methods:

Fabrication of Au-core-Ag-shell nanoparticles using a layer-by-layer deposition technique.
Embedding dye molecules within polyelectrolyte layers between the gold core and silver shell.
Utilizing spectral measurements to characterize SERS and SEF properties.

Main Results:

Successfully prepared Au-core-Ag-shell nanoparticles exhibiting both SERS and SEF.
Demonstrated that polyelectrolytes effectively control dye molecule spacing and position.
Spectral analysis revealed insights into the interplay between SERS and SEF mechanisms within the nanostructures.

Conclusions:

The developed methodology offers a flexible approach for creating multifunctional plasmonic nanostructures.
Simultaneous SERS and SEF can be achieved by strategic embedding of dye molecules.
This work provides a foundation for designing advanced nanomaterials for sensing and imaging applications.