Study on the Electrochemical Array Sensor using pn Junctions of the Inorganic Semiconductor

Kosugi, Keita; Hasegawa, Yuki; Uchida, Hidekazu

doi:10.1541/ieejsmas.138.204

Cited by 1 publication

(2 citation statements)

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“…Some measurements use array electrodes with such wiring and are unsuitable for high‐throughput screening [30–36] because such wiring restrict measurement environment. To solve this problem, we developed an array electrode sensor with a simple structure using the inner photoelectric effect [37–40]. Light‐addressable amperometric sensors (LAAS) are two‐dimensional amperometric electrochemical array sensors that use the principles of the inner photoelectric effect.…”

Section: Introductionmentioning

confidence: 99%

“…Further, measurement principles based on amperometry are used because of their advantages: the LAAS requires only a pair of wires for two‐dimensional measurement, with a light beam irradiated on the measurement element. Therefore, LAAS enables two‐dimensional image sensing as well as high‐throughput measurements from array elements [37–40]. However, the surface area of the electrode decreases based on the shape of the array element.…”

Section: Introductionmentioning

confidence: 99%

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Light‐Addressable Amperometric Sensor with Counter and Working Electrodes of the Same Material

Kosugi

Hasegawa

Uchida

2021

IEEJ Transactions Elec Engng

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High‐throughput screening is important in various fields, and electrochemical approaches are effective because of advantages such as fast response time and electrode array. Hence, we developed a two‐dimensional electrochemical array sensor. However, its signal intensities for lower concentrations of the redox pair (100 μM–100 pM [Fe[CN]6]3−/4−) were unstable; Therefore, in this study, we investigated and demonstrated a method for improving the signal stability at lower concentrations. Two types of counter electrodes were prepared to assess their influence; the material of the first electrode was the same as that of the working electrode (same material condition), and the other was prepared from a different material (different material condition). First, the differences in the electric potentials between different materials were investigated at lower concentrations. Furthermore, the concentration dependence was investigated using our newly developed light‐addressable amperometric sensor for the two conditions. In the different condition, it was observed that differences in the electric potentials between the electrodes at lower concentrations. It was also observed that the signal intensity was more stable for the same material condition than the different material condition. Limit of detection(LOD) for the same material condition was lower than that under the different material condition. The proposed method using the same materials is thus an effective means to measure low concentrations of redox ions and expected to contribute to a fabrication of a smaller and more stable device without reference electrode. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%