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Nanoscale Vol - 4 Issue - 6

Nanoscale Vol - 4 Issue - 5

Nanoscale Vol - 4 Issue - 4

Nanoscale Vol - 4 Issue - 3

Nanoscale Vol -3

Nanoscale Vol -2

Nanoscale Vol -1

Nanoplasmonic sensing of metal–halide complex formation and the electric double layer capacitor

Content Provider	Royal Society of Chemistry (RSC)
Author	Vörös, Janos Dahlin, Andreas B. Zahn, Raphael
Copyright Year	2012
Abstract	Many nanotechnological devices are based on implementing electrochemistry with plasmonic nanostructures, but these systems are challenging to understand. We present a detailed study of the influence of electrochemical potentials on plasmon resonances, in the absence of surface coatings and redox active molecules, by synchronized voltammetry and spectroscopy. The experiments are performed on gold nanodisks and nanohole arrays in thin gold films, which are fabricated by improved methods. New insights are provided by high resolution spectroscopy and variable scan rates. Furthermore, we introduce new analytical models in order to understand the spectral changes quantitatively. In contrast to most previous literature, we find that the plasmonic signal is caused almost entirely by the formation of ionic complexes on the metal surface, most likely gold chloride in this study. The refractometric sensing effect from the ions in the electric double layer can be fully neglected, and the charging of the metal gives a surprisingly small effect for these systems. Our conclusions are consistent for both localized nanoparticle plasmons and propagating surface plasmons. We consider the results in this work especially important in the context of combined electrochemical and optical sensors.
Starting Page	2339
Ending Page	2351
Page Count	13
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	4
Issue Number	7
Journal	Nanoscale
DOI	10.1039/c2nr11950a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Gold chloride Spectroscopy Nanoparticle Electrochemistry Redox Voltammetry
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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