Waveguide surface plasmon resonance studies of surface reactions on gold electrodes

A.K. Sheridan

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We describe the fabrication and characterisation of gold-coated graded index channel waveguide sensors designed for simultaneous electrochemical and surface plasmon resonance studies. The active sensing electrode area is a thin gold film between 0.5 and 5 mm in length and 200 µm wide deposited on top of a 3 µm wide waveguide which forms one arm of a Y-junction while the other arm of the Y-junction serves as a reference. Using these devices we have measured simultaneously the changes in transmittance through the device whilst carrying out cyclic voltammetry in either sulfuric or perchloric acid solution or during the deposition of an UPD layer of copper at the gold surface. In all cases we obtain stable and reproducible results which demonstrate the very high sensitivity of the devices to sub-monolayer changes occurring at the gold electrode surface. The response of these integrated optoelectrochemical devices is discussed in terms of a numerical model for the propagation of light within the waveguide structure.
LanguageEnglish
Pages139-152
Number of pages14
JournalFaraday Discussions
Volume121
DOIs
Publication statusPublished - 2002

Fingerprint

Surface reactions
Surface plasmon resonance
surface plasmon resonance
Gold
surface reactions
Waveguides
gold
waveguides
Electrodes
electrodes
perchloric acid
sulfuric acid
Cyclic voltammetry
Copper
Numerical models
Monolayers
transmittance
Fabrication
copper
fabrication

Keywords

  • surface plasmon
  • surface plasmon resonance
  • gold electrodes

Cite this

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Waveguide surface plasmon resonance studies of surface reactions on gold electrodes. / Sheridan, A.K.

In: Faraday Discussions, Vol. 121, 2002, p. 139-152.

Research output: Contribution to journalArticle

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AB - We describe the fabrication and characterisation of gold-coated graded index channel waveguide sensors designed for simultaneous electrochemical and surface plasmon resonance studies. The active sensing electrode area is a thin gold film between 0.5 and 5 mm in length and 200 µm wide deposited on top of a 3 µm wide waveguide which forms one arm of a Y-junction while the other arm of the Y-junction serves as a reference. Using these devices we have measured simultaneously the changes in transmittance through the device whilst carrying out cyclic voltammetry in either sulfuric or perchloric acid solution or during the deposition of an UPD layer of copper at the gold surface. In all cases we obtain stable and reproducible results which demonstrate the very high sensitivity of the devices to sub-monolayer changes occurring at the gold electrode surface. The response of these integrated optoelectrochemical devices is discussed in terms of a numerical model for the propagation of light within the waveguide structure.

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