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A Method to Fabricate Disconnected Silver Nanostructures in 3D
Published on: November 27, 2012
Metal-enhanced fluorescence from silver-SiO2-silver nanoburger structures.
Yongxia Zhang1, Lynda N Mandeng, Nina Bondre
1Institute of Fluorescence, University of Maryland Baltimore County, 701 East Pratt Street, Baltimore, Maryland 21202, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 22, 2010
Summary
Multilayer nanoburgers with silver island films (SIFs) significantly enhance fluorophore fluorescence and photostability by tuning the dielectric layer thickness. This metal-enhanced fluorescence (MEF) opens new avenues for biological and biomedical imaging applications.
Area of Science:
- Nanotechnology
- Materials Science
- Optical Physics
Background:
- Silver island films (SIFs) are known to influence fluorescence.
- Understanding metal-enhanced fluorescence (MEF) is crucial for advanced optical applications.
- Previous studies often focused on single-layered structures.
Purpose of the Study:
- To investigate the fluorescence properties of multilayer nanoburger structures (SIFs-SiO(2)-SIFs).
- To explore the impact of dielectric layer thickness on fluorescence enhancement.
- To elucidate the mechanisms behind metal-enhanced fluorescence in these nanostructures.
Main Methods:
- Fabrication of multilayer nanoburger substrates (SIFs-SiO(2)-SIFs).
- Experimental study of fluorescence intensity, lifetime, and photostability of fluorophores on these substrates.
- Finite-difference time-domain (FDTD) calculations to model electric field intensity.
Main Results:
- Multilayer nanoburgers showed significantly enhanced fluorescence intensity compared to single-layered SIFs.
- Fluorophore lifetimes decreased, and photostability increased with multilayer structures.
- Tunable electric field intensity was observed by varying the distance between silver particles.
Conclusions:
- The tunable multilayer nanoburger structure is effective for metal-enhanced fluorescence (MEF).
- Both electric field enhancement and plasmon-coupling contribute to MEF in these systems.
- This platform offers significant potential for applications in biology, microscopy, imaging, and biomedical research.
