Journal Article10.1021/AC961272G
The Electroactive Integrated Optical Waveguide: Ultrasensitive Spectroelectrochemistry of Submonolayer Adsorbates
TL;DR: The electroactive integrated optical waveguide (EA-IOW), a single-mode planar waveguide coated with an ITO layer, is ∼10(4)-fold more sensitive to changes in absorbance occurring during electrochemical events versus asingle-pass transmission spectroelectrochemical experiment, as demonstrated by reduction of surface-adsorbed methylene blue.
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Abstract: Highly sensitive spectroelectrochemistry of adsorbed films on ITO is demonstrated with the electroactive integrated optical waveguide (EA-IOW). The EA-IOW, a single-mode planar waveguide coated with an ITO layer, is ∼104-fold more sensitive to changes in absorbance occurring during electrochemical events versus a single-pass transmission spectroelectrochemical experiment, as demonstrated by reduction of surface-adsorbed methylene blue. Furthermore, the EA-IOW is selective to near-surface events, as it is relatively insensitive to absorbance by solutions of dissolved chromophores at <1 mM. The EA-IOW is also used to monitor the formation of Prussian Blue during the reduction of ferricyanide, an event that is not easily followed using current-detected cyclic voltammetry, due to interfering faradaic and non-faradaic electrochemical events. The optical background of the EA-IOW is potential-dependent and is explained by ion diffusion into the ITO and by voltage-dependent changes in optical constants for the ma...
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Citations
Characterization of Indium−Tin Oxide Interfaces Using X-ray Photoelectron Spectroscopy and Redox Processes of a Chemisorbed Probe Molecule: Effect of Surface Pretreatment Conditions
Carrie L. Donley,Darren R. Dunphy,David C. Paine,Chet Carter,Ken W. Nebesny,Paul A. Lee,Dana M. Alloway,Neal R. Armstrong +7 more
TL;DR: In this article, a monochromatic X-ray photoelectron spectroscopy (XPS) was used for surface characterization of indium−tin oxide (ITO) thin films.
408
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TL;DR: In this paper, the surface characterization of commercially available indium-tinoxide (ITO) thin films, using photoelectron spectroscopies (XPS and UPS) and electrochemistry of chemisorbed probe molecules such as ferrocene dicarboxylic acid (Fc(COOH)2), 3-thiophene acetic acid (3-TAA), and subsequent modification of these interfaces with electrochemically grown conducting polymer (CP) films is introduced.
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