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

Welden, Rene; Schöning, Michael J.; Wagner, Patrick; Wagner, Torsten

doi:10.3390/s20061680

Cited by 10 publications

(6 citation statements)

References 116 publications

(154 reference statements)

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“…We next sought to understand how SWV would impact LAE sensors when they are partially illuminated with varying amounts of power. This type of experimental condition is used when imaging ,, and performing array-type measurements , with LAE sensors. Under these conditions, the dark currents are proportional to the electrolyte contact area, while the illuminated currents will be proportional to the illuminated area.…”

Section: Resultsmentioning

confidence: 99%

Square-Wave Voltammetry Enables Measurement of Light-Activated Oxidations and Reductions on n-Type Semiconductor/Metal Junction Light-Addressable Electrochemical Sensors

et al. 2023

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Light-addressable electrochemical (LAE) sensing is a photoelectrochemical technique that enables high-density, individually addressed electrochemical measurements using light to activate an electrochemical reaction at the surface of a semiconducting photoelectrode. However, one major challenge is that only one electrochemical reaction (oxidation or reduction) will be activated by light. Here, we used square-wave voltammetry (SWV) to enable measurement of both types of electrochemical reactions using n-Si/Au NP LAE sensors. We demonstrated this approach for the oxidation of ferrocene methanol and the reduction of ruthenium hexamine and methylene blue. We found that for all molecules, SWV showed dramatic improvements in current under illumination in comparison with dark samples. We also demonstrated that this approach works for both fully illuminated and partially illuminated samples. Altogether, we hope these results open up new applications for LAE sensors, especially those based on semiconductor/metal junctions.

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Section: Resultsmentioning

confidence: 99%

Square-Wave Voltammetry Enables Measurement of Light-Activated Oxidations and Reductions on n-Type Semiconductor/Metal Junction Light-Addressable Electrochemical Sensors

et al. 2023

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“…This type of experimental condition is used when imaging 22,27,76,77 and performing array-type measurements 2,4 with LAE sensors. Under these conditions, the dark currents are proportional to the electrolyte contact area, while the illuminated currents will be proportional to the illuminated area.…”

Section: Resultsmentioning

confidence: 99%

Square wave voltammetry enables measurement of light-activated oxidations and reductions on n-type semiconductor/metal junction light-addressable electrochemical sensors

Arthur

Ali

Hussain

et al. 2023

Preprint

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Light-addressable electrochemical sensing (LAES) is a photoelectrochemical technique that enables high-density, individually addressed electrochemical measurements using light to activate an electrochemical reaction at the surface of a semiconducting photoelectrode. However, one major challenge is that only one electrochemical reaction (oxidation or reduction) will be activated by light. Here, we use square wave voltammetry (SWV) to enable measurements of both types of electrochemical reactions using n-Si/Au NP LAE sensors. We demonstrated this approach for the oxidation of ferrocene methanol and the reductions of ruthenium hexamine and methylene blue. We found that for all molecules, SWV showed dramatic improvements in current under illumination in comparison with dark samples. We also demonstrate that this approach works for both fully illuminated and partially illuminated samples. Altogether, we hope these results open up new applications for LAE sensors, especially those based on semiconductor/metal junctions.

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“…Taking advantage of the photoelectric effect within a semiconductor enables a shift of the electrochemical paradigm from individually connected measurement electrodes to the illumination of a focused light beam to enable photoelectrochemical sensing at specific locations. For example, photostimulus-enabled direct charge transfer at the electrolyte-semiconductor interface has gained tremendous popularity due to its unique light-addressability in defining measurement or manipulation spots [3,4].…”

Section: Light-addressable Electrochemistrymentioning

confidence: 99%

Light in Electrochemistry

2021

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Electrochemistry represents an important analytical technique used to acquire and assess chemical information in detail, which can aid fundamental investigations in various fields, such as biological studies. For example, electrochemistry can be used as simple and cost-effective means for bio-marker tracing in applications, such as health monitoring and food security screening. In combination with light, powerful spatially-resolved applications in both the investigation and manipulation of biochemical reactions begin to unfold. In this article, we focus primarily on light-addressable electrochemistry based on semiconductor materials and light-readable electrochemistry enabled by electrochemiluminescence (ECL). In addition, the emergence of multiplexed and imaging applications will also be introduced.

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

Cited by 10 publications

References 116 publications

Square-Wave Voltammetry Enables Measurement of Light-Activated Oxidations and Reductions on n-Type Semiconductor/Metal Junction Light-Addressable Electrochemical Sensors

Square-Wave Voltammetry Enables Measurement of Light-Activated Oxidations and Reductions on n-Type Semiconductor/Metal Junction Light-Addressable Electrochemical Sensors

Square wave voltammetry enables measurement of light-activated oxidations and reductions on n-type semiconductor/metal junction light-addressable electrochemical sensors

Light in Electrochemistry

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