Surface-enhanced Raman spectroscopy using lipid encapsulated plasmonic nanoparticles and J-aggregates to create locally enhanced electric fields

Colin R. Zamecnik, Aftab Ahmed, Christopher M. Walters, Reuven Gordon, Gilbert C. Walker

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Semiconductor-metal composite nanoparticles offer optical properties that are superior to those of pure materials. In this study, we exploit the epsilon near zero (ENZ) phenomenon using silver nanoparticles functionalized with a thiacyanine dye, which formed a distinct J-aggregate on the surface of the particle. These J-aggregates show a distinct nonlinear optical response, and a wavelength matching approach was used to couple the plasmonic particle to the J-aggregate. When the appropriate wavelength is utilized, these particles showed an enhanced surface-enhanced Raman spectroscopy (SERS) signal as a result of the excitonic resonance of the J-aggregate species. The theoretical properties of the particles were simulated using FDTD techniques, and these were experimentally verified by varying the distance between the dye and particle surface. Experimental SERS spectra had excellent agreement with simulations. These composite particles were then encapsulated in a lipid bilayer, forming a multishell structure with properties suitable for biosensing and other detection applications.

Original languageEnglish (US)
Pages (from-to)1879-1886
Number of pages8
JournalJournal of Physical Chemistry C
Volume117
Issue number4
DOIs
StatePublished - Jan 31 2013
Externally publishedYes

Bibliographical note

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

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