Photoelectrochemical Immunoassays

Zhao, Weiwei; Xu, Jing‐Juan; Chen, Hong‐Yuan

doi:10.1021/acs.analchem.7b04672

Cited by 261 publications

(133 citation statements)

References 187 publications

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“…For a photocathode the situation is reversedthe cathodic peak is most sensitive to changes in θ. While θ accounts for the shape of the peak, the peak position is defined by EOC, which is a function of the I0/(I0+IL) ratio, as shown in eq (7). I / I I  ratio) when θ < 10 −2 , that is, when the shape of the voltammograms on semiconductors is like that on a metallic electrode.…”

Section: E E E  mentioning

confidence: 99%

Quantitative Analysis of Cyclic Voltammetry of Redox Monolayers Adsorbed on Semiconductors: Isolating Electrode Kinetics, Lateral Interactions, and Diode Currents

et al. 2019

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The design of devices whose functions span from sensing their environments, to convert light into electricity or to guide chemical reactivity at surfaces, often hinges around a correct and complete understanding of the factors at play when charges are transferred across an electrified solid/liquid interface. For semiconductor electrodes in particular, published values for charge transfer kinetic constants are scattered. Furthermore, received wisdom suggests slower charge transfer kinetics for semiconductor than for metal electrodes. We have used cyclic voltammetry of ferrocene-modified silicon photoanodes and photocathodes as the experimental model system, and described a systematic analysis to separate charge transfer kinetics from diode effects and interactions between adsorbed species. Our results suggest that literature values of charge transfer kinetic constants at semiconductor electrodes are likely to be an underestimate of their actual values. This is revealed by experiments and analytical models, showing that the description of the potential distribution across the semiconductor/monolayer/electrolyte interface has been largely oversimplified.

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Section: E E E  mentioning

confidence: 99%

Quantitative Analysis of Cyclic Voltammetry of Redox Monolayers Adsorbed on Semiconductors: Isolating Electrode Kinetics, Lateral Interactions, and Diode Currents

et al. 2019

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“…[13] Besides, it is also promising because it enables 2D reaction confinement on the transducer surface (i. e. on the photoelectrode) [14,15] which can be useful for electrode reuse [16,17] or for the design of multiplexed arrays. [18,19] So far, PEC sensing has been mainly employed for the detection of biological macromolecules, [20] in immuno- [21] or apta- [22] assays and has also been explored for the detection of small organic molecules such as antioxidants [23] or glucose. [24,25] While H 2 O 2 is a widely-employed hole scavenger in the field of energy-related photoelectrochemical research (typically used to probe the upper performance of watersplitting photoanodes), [26,27] the PEC sensing of H 2 O 2 has been only reported on TiO 2 , [28][29][30] WO 3 , [31] ZnO, [32,33] BiVO 4 , [34,35] and Si [36] -based photoanodes and on Cu 2 O, [37] CuO, [38] CdS, [39] and CuInS 2 [40] -based photocathodes.…”

Section: Photoelectrochemical Sensing Of Hydrogen Peroxide On Hematitementioning

confidence: 99%

Photoelectrochemical Sensing of Hydrogen Peroxide on Hematite

et al. 2020

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Due to its abundance and chemical stability, hematite (α‐Fe2O3) is a promising n‐type semiconductor photoelectrode. This is particularly true in the frame of the rapidly developing area of photoelectrochemical (PEC) sensing, where the short excited‐state lifetime and the small carrier diffusion length of hematite can be beneficially employed. On the other hand, H2O2 is an essential molecule for biological, environmental and industrial applications. In this article, we report a simple method to prepare photoelectroactive hematite layers on fluorine‐doped SnO2 (FTO) and we use these surfaces for H2O2 PEC sensing. The so‐created sensors allow to reliably detect H2O2 down to a sub‐μM concentration with a large linear range and a good reusability.

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“…Well-known examples are photoelectrochemical cells [32,33] and dye-sensitized solar cells [34], to which a tremendous amount of reseach is dedicated. Nevertheless, also other fields were established based on photoelectrochemistry: photoelectrochemical sensors [35][36][37], for various applications, including DNA (deoxyribonucleic acid) [38], immuno [39], enzymatic [40], and heavy metal sensing [41] are known in the literature. Mainly to trigger detection, those chips are fully illuminated with a single light source and the possibility of addressing multiple analytes or areas of the sensor is disregarded.…”

Section: Introductionmentioning

confidence: 99%

Light-addressable Electrodes for Dynamic and Flexible Addressing of Biological Systems and Electrochemical Reactions

Welden

Schöning

Wagner

et al. 2020

Sensors

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In this review article, we are going to present an overview on possible applications of light-addressable electrodes (LAE) as actuator/manipulation devices besides classical electrode structures. For LAEs, the electrode material consists of a semiconductor. Illumination with a light source with the appropiate wavelength leads to the generation of electron-hole pairs which can be utilized for further photoelectrochemical reaction. Due to recent progress in light-projection technologies, highly dynamic and flexible illumination patterns can be generated, opening new possibilities for light-addressable electrodes. A short introduction on semiconductor-electrolyte interfaces with light stimulation is given together with electrode-design approaches. Towards applications, the stimulation of cells with different electrode materials and fabrication designs is explained, followed by analyte-manipulation strategies and spatially resolved photoelectrochemical deposition of different material types.

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Photoelectrochemical Immunoassays

Cited by 261 publications

References 187 publications

Quantitative Analysis of Cyclic Voltammetry of Redox Monolayers Adsorbed on Semiconductors: Isolating Electrode Kinetics, Lateral Interactions, and Diode Currents

Quantitative Analysis of Cyclic Voltammetry of Redox Monolayers Adsorbed on Semiconductors: Isolating Electrode Kinetics, Lateral Interactions, and Diode Currents

Photoelectrochemical Sensing of Hydrogen Peroxide on Hematite

Light-addressable Electrodes for Dynamic and Flexible Addressing of Biological Systems and Electrochemical Reactions

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