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Luminescent Silica Core / Silver Shell Encapsulated with Eu(III) Complex.

Jian Zhang¹, Yi Fu, Joseph R Lakowicz

¹Center for Fluorescence Spectroscopy, University of Maryland School of Medicine, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces

|June 2, 2010

Summary

Silver nanoshells significantly enhance light emission from lanthanide dyes. This core-shell structure, with optimal metal thickness, shows promise for single-molecule detection applications.

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Area of Science:

Nanotechnology
Materials Science
Spectroscopy

Background:

Lanthanide dyes offer long luminescence lifetimes.
Metal nanoshells can modify optical properties of encapsulated materials.

Purpose of the Study:

To investigate metal-enhanced emission from lanthanide dyes within silver nanoshells.
To determine the effect of nanoshell thickness on emission enhancement.

Main Methods:

Synthesis of silver nanoshells with silica cores (50 nm).
Varied silver shell thickness (5-60 nm).
Optical property analysis using ensemble fluorescence spectroscopy and single-particle imaging.

Main Results:

Significant emission intensity enhancement of encapsulated lanthanides.
Enhancement efficiency peaked at 20-30 nm shell thickness.
Dramatically shortened lifetime of encapsulated Europium(III) complexes.

Conclusions:

Silver nanoshells efficiently enhance lanthanide emission.
Optimized core-shell structures improve brightness and reduce lifetime.
Potential for lanthanides in metal nanoshells for single-target molecule detection.