A Comparative Plasmonic Study of Nanoporous and Evaporated Gold Films

Stefanie Ahl, Petra J Cameron, Jing Liu, Wolfgang Knoll, Jonah Erlebacher, Fang Yu

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Previously, we have reported that nanoporous gold (NPG) films prepared by a chemical dealloying method have distinctive plasmonic properties, i.e., they can simultaneously support localized and propagating surface plasmon resonance modes (l-SPR and p-SPR, respectively). In this study, the plasmonic properties of NPG are quantified through direct comparison with thermally evaporated gold (EG) films. Cyclic voltammetry and electrochemical impedance spectroscopy experiments reveal that the NPG films have 4-8.5 times more accessible surface area than EG films. Assemblies of streptavidin-latex beads generate p-SPR responses on both NPG and EG films that correlate well with the bead density obtained from scanning electron microscopy (SEM) images. A layer-by-layer assembly experiment on NPG involving biotinylated anti-avidin IgG and avidin, studied by l-SPR and SEM, shows that the l-SPR signal is directly linked to the accessibility of the interior of the NPG porosity, an adjustable experimental parameter that can be set by the dealloying condition and time. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s11468-007-9048-5) contains supplementary material, which is available to authorized users.
Original languageEnglish
Pages (from-to)13-20
Number of pages8
JournalPlasmonics
Volume3
Issue number1
DOIs
Publication statusPublished - 2008

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