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The Role of Anion Adsorption in the Effect of Electrode Potential on Surface Plasmon Resonance Response

  • Surface plasmon resonance, being widely used in bioanalytics and biotechnology, is influenced by the electrical potential of the resonant gold layer. To evaluate the mechanism of this effect, we have studied it in solutions of various inorganic electrolytes. The magnitude of the effect decreases according to the series: KBr>KCl>KF>NaClO4. The data were treated by using different models of the interface. A quantitative description was obtained for the model, which takes into account the local dielectric function of gold being affected by the free electron charge, diffuse ionic layer near the gold/water interface, and specific adsorption of halides to the gold surface with partial charge transfer. Taking into account that most biological experiments are performed in chloride-containing solutions, detailed analysis of the model at these conditions was performed. The results indicate that the chloride adsorption is the main mechanism for the influence of potential on the surface plasmon resonance. The dependencies of surface concentrationSurface plasmon resonance, being widely used in bioanalytics and biotechnology, is influenced by the electrical potential of the resonant gold layer. To evaluate the mechanism of this effect, we have studied it in solutions of various inorganic electrolytes. The magnitude of the effect decreases according to the series: KBr>KCl>KF>NaClO4. The data were treated by using different models of the interface. A quantitative description was obtained for the model, which takes into account the local dielectric function of gold being affected by the free electron charge, diffuse ionic layer near the gold/water interface, and specific adsorption of halides to the gold surface with partial charge transfer. Taking into account that most biological experiments are performed in chloride-containing solutions, detailed analysis of the model at these conditions was performed. The results indicate that the chloride adsorption is the main mechanism for the influence of potential on the surface plasmon resonance. The dependencies of surface concentration and residual charge of chloride on the applied potential were determined.show moreshow less

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Metadaten
Author: Veronika K. LaurinavichyuteORCiD, Shavkat NizamovORCiD, Vladimir M. MirskyORCiDGND
DOI:https://doi.org/10.1002/cphc.201601288
ISSN:1439-7641
ISSN:1439-4235
Title of the source (English):ChemPhysChem : a European journal of physical chemistry and chemical physics
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2017
Volume/Year:18
Issue number:12
First Page:1552
Last Page:1560
Faculty/Chair:Fakultät 2 Umwelt und Naturwissenschaften / FG Nanobiotechnologie
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