Flow-through Electrochemical Surface Plasmon Resonance: Detection of intermediate reaction products

Huang, Xinping; Wang, Shaopeng; Shan, Xiaonan; Chang, Xijun; Tao, Nongjian

doi:10.1016/j.jelechem.2009.12.027

Cited by 24 publications

(9 citation statements)

References 49 publications

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“…The first redox system, quinone-hydroquinone (Q/HQ), proceeds via a free radical intermediate [15], but the second redox system, Ru As expected, the Q/HQ process became slower and slower as the electrode was exposed to hydroxyl radicals and the active sites were selectively knocked out. Chronocoulometry was used to exclude the involvement of any adsorption phenomena.…”

Section: Introduction and Resultsmentioning

confidence: 76%

Selective Knockout of Gold Active Sites

et al. 2010

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KEYWORDS Electrochemistry • gold • kinetics • radicals • voltammetry 2 ABSTRACTIt has long been known that defects on a gold surface play an important role in electrocatalysis, but the precise mechanism has always been unclear. This work indicates that the defect sites provide partially filled d-orbitals that stabilize freeradical intermediates. Strong evidence for this hypothesis is that the sites can be selectively knocked out by treatment with OH• radicals generated by Fenton's reagent. The knockout effect is demonstrated using oxygen reduction, hydrogen reduction, and the redox electrochemistry of hydroquinone.

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Section: Introduction and Resultsmentioning

confidence: 76%

Selective Knockout of Gold Active Sites

et al. 2010

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“…It has found numerous applications in bioanalytics [8][9][10][11][12] and in surfaces cience. [13,14] The data interpretation is relatively straightforward if the changes in optical signal are triggered by as ingle electrochemical process followed by ar elatively slow chemical reactioni nt he solution [15] or by formation/dissolution of some interfacial layers,f or example, Hg-Aua malgam. [14] However,a ne ffect of the electrode potential on the SPR signali so bserved also when no faradaic process takes place.…”

Section: Introductionmentioning

confidence: 99%

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

2017

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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>NaClO . 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.

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“…The resulting current contains two components; a non-faradaic component, due to charging of the interfacial capacitance, and a faradaic component associated with an electrochemical reaction. This is exploited in EC-SPR to greatly extend the application space available to SPR, enabling SPR to be applied to the study of enzymatic processes [ 43 ], anodic stripping [ 44 , 45 ], potential-controlled molecular adsorption, charge transfer processes [ 42 , 46 ], and the characterization of electrochemical DNA sensors [ 47 ].…”

Section: Electro-optical Multi-domain Techniquesmentioning

confidence: 99%

Dual-Mode Electro-Optical Techniques for Biosensing Applications: A Review

Juan-Colás

Johnson

Krauss

2017

Sensors

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The monitoring of biomolecular interactions is a key requirement for the study of complex biological processes and the diagnosis of disease. Technologies that are capable of providing label-free, real-time insight into these interactions are of great value for the scientific and clinical communities. Greater understanding of biomolecular interactions alongside increased detection accuracy can be achieved using technology that can provide parallel information about multiple parameters of a single biomolecular process. For example, electro-optical techniques combine optical and electrochemical information to provide more accurate and detailed measurements that provide unique insights into molecular structure and function. Here, we present a comparison of the main methods for electro-optical biosensing, namely, electrochemical surface plasmon resonance (EC-SPR), electrochemical optical waveguide lightmode spectroscopy (EC-OWLS), and the recently reported silicon-based electrophotonic approach. The comparison considers different application spaces, such as the detection of low concentrations of biomolecules, integration, the tailoring of light-matter interaction for the understanding of biomolecular processes, and 2D imaging of biointeractions on a surface.

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Flow-through Electrochemical Surface Plasmon Resonance: Detection of intermediate reaction products

Cited by 24 publications

References 49 publications

Selective Knockout of Gold Active Sites

Selective Knockout of Gold Active Sites

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

Dual-Mode Electro-Optical Techniques for Biosensing Applications: A Review

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