Plasmon Enhanced Fluorescence with Aggregated Shell-Isolated Nanoparticles

Shell-isolated nanoparticles (SHINs) nanostructures provide a versatile substrate where the localized surface plasmon resonances (LSPRs) are well-defined. For SHINEF, the silver (or gold) metal core is protected by the SiO2 coating, which is thicker than the critical distance for minimum quenching b...

Full description

Saved in:
Bibliographic Details
Published in:Analytical chemistry (Washington) 2014-10, Vol.86 (20), p.10246-10251
Main Authors: Osorio-Román, Igor O, Guerrero, Ariel R, Albella, Pablo, Aroca, Ricardo F
Format: Article
Language:English
Subjects:
Agglomeration
Electrolytes
Fluorescence
Gold
Nanoparticles
Nanostructure
Plasmons
Quenching
Substrates
Tuning
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Shell-isolated nanoparticles (SHINs) nanostructures provide a versatile substrate where the localized surface plasmon resonances (LSPRs) are well-defined. For SHINEF, the silver (or gold) metal core is protected by the SiO2 coating, which is thicker than the critical distance for minimum quenching by the metal. In the present work, it is shown that an increase in the SHINEF enhancement factor may be achieved by inducing SHIN aggregation with electrolytes in solution. The proof of concept is demonstrated using NaCl as aggregating agent, although other inorganic salts will also aggregate SHIN nanoparticles. As much as a 10-fold enhancement in the SHINEF enhancement factor (EF) may be achieved by tuning the electrolyte concentrations in solution. The SHINEF experiments include the study of the aggregation effect controlling gold SHIN’s surface concentration via spraying. Au-SHINs are sprayed onto layer-by-layer (LbL) and Langmuir–Blodgett (LB) films, and samples are fabricated using fluorophores with low and also high quantum yield.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac502424g