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Surface-enhanced Raman scattering on nanoshells with tunable surface plasmon resonance
Ramon A Alvarez-Puebla1, Daniel J Ross, G-Abbas Nazri
1Materials and Surface Science Group, Faculty of Sciences, University of Windsor, Ontario, Canada.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 3, 2005
Summary
Researchers fabricated tunable silver-gold (AgAu) nanoparticles and nanoshells for optical enhancement. These bimetallic nanostructures show promise for surface plasmon-assisted spectroscopy, with nanoshells potentially outperforming silver sols.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Bimetallic nanoparticles offer tunable optical properties.
- Surface plasmon resonance is key for optical enhancement applications.
Purpose of the Study:
- To fabricate and characterize silver-gold (AgAu) nanoparticles and nanoshells.
- To investigate their optical properties and potential for surface plasmon-assisted enhanced spectroscopy.
Main Methods:
- Synthesis of AgAu nanoparticles and nanoshells at room temperature.
- Characterization using transmission electron microscopy, X-ray photoelectron spectroscopy, and photon correlation spectroscopy.
- Mie theory for plasmon absorption calculations.
Main Results:
- Tunable surface plasmon resonances in the 400-990 nm spectral range.
- Demonstrated controllable tunability of collective electron oscillation.
- Surface-enhanced Raman scattering (SERS) experiments showed potential for higher enhancement factors with nanoshells compared to silver sols.
Conclusions:
- AgAu nanoparticles and nanoshells are viable for optical enhancement.
- Tunable plasmon resonances make them suitable substrates for enhanced spectroscopy.
- Nanoshells exhibit promising performance for SERS applications.