A Comparative Plasmonic Study of Nanoporous and Evaporated Gold Films |
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Authors: | Stefanie Ahl Petra J Cameron Jing Liu Wolfgang Knoll Jonah Erlebacher Fang Yu |
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Institution: | (1) Department of Materials Science, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;(2) Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;(3) Present address: Department of Chemistry, University of Bath, Bath, BA2 2TB, UK;(4) Siemens X-Ray Vacuum Technology Ltd., Wuxi, 214028, People’s Republic of China;(5) Department of Chemistry, Stanford University, Stanford, CA 94305, USA |
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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:) contains supplementary material, which is available to authorized users. |
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Keywords: | Surface plasmon resonance Alloys Layer deposition Spectroscopy Nanoporous gold Gold films Electrochemistry |
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