Spectroscopy, imaging, and modeling of individual gold decahedra

Jessica Rodriguez-Fernandez, Carolina Novo, Viktor Myroshnychenko, Alison May Funston, Ana Sanchez-Iglesias, Isabel Pastoriza-Santos, Jorge Perez-Juste, F Javier Garcia de Abajo, Luis M Liz-Marzan, Paul Mulvaney

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63 Citations (Scopus)

Abstract

Gold nanodecahedra (pentagonal bipyramids) exhibit striking optical properties spanning the visible and near-IR spectral regions, which together with a high electric-field enhancement at their tips, makes them very promising materials for sensing-related applications. The effective design of biosensors based on these nanocrystals requires a detailed investigation, and understanding of their surface plasmon resonances. For that purpose, we have used correlated electron microscopy imaging and optical dark-field spectroscopy on individual decahedra to investigate their size and orientation-de pendent optical properties at the single particle level. We have also investigated the effects-of tip truncation and local refractive index changes on single particle plasmon resonances. The experimental results are supported by theoretical modeling based on a fully 3D, boundary element method (BEM-3D).
Original languageEnglish
Pages (from-to)18623 - 18631
Number of pages9
JournalJournal of Physical Chemistry C
Volume113
Issue number43
DOIs
Publication statusPublished - 2009
Externally publishedYes

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