Plasmon modes and hot spots in gold nanostar-satellite clusters

Amane Shiohara, Sergey M. Novikov, Diego M. Solís, José M. Taboada, Fernando Obelleiro, Luis M. Liz-Marzán

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42 Citations (Scopus)

Abstract

Gold nanostars display strong electromagnetic field enhancement at their tips, and tip plasmon resonances can be tuned within the visible and near-infrared, which has been applied toward plasmonic molecular sensing. However, the sensitivity can be further increased by linking gold nanostars to other plasmonic nanoparticles and thereby inducing the creation of hot spots. We report the controlled formation of core-satellite assemblies comprising a central gold nanostar with gold spheres adsorbed to the tips via Raman active molecular linkers. Surface-enhanced Raman scattering (SERS) was recorded at the level of single gold nanostar-satellite clusters, and the experimental results were compared with detailed electromagnetic simulations.

Original languageEnglish
Pages (from-to)10836-10843
Number of pages8
JournalJournal of Physical Chemistry C
Volume119
Issue number20
DOIs
Publication statusPublished - 21 May 2015
Externally publishedYes

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