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.

中文翻译：

---

具有相同材料的对电极和工作电极的光寻址安培传感器

高通量筛选在各个领域都很重要，而电化学方法由于具有响应时间短和电极排列快等优点，因此非常有效。因此，我们开发了二维电化学阵列传感器。但是，对于较低浓度的氧化还原对（100 μM–100 pM [Fe [CN] ₆ ] ^{3- / 4 /}）不稳定；因此，在这项研究中，我们研究并证明了一种在较低浓度下改善信号稳定性的方法。准备两种类型的对电极以评估其影响。第一电极的材料与工作电极的材料相同（相同的材料条件），另一电极由不同的材料（不同的材料条件）制备。首先，在较低浓度下研究了不同材料之间的电势差。此外，使用我们新开发的光寻址安培传感器针对两种情况研究了浓度依赖性。在不同条件下，观察到在较低浓度下电极之间的电势差异。还观察到，相同材料条件下的信号强度比不同材料条件下更稳定。相同材料条件下的检出限（LOD）低于不同材料条件下的检出限。因此，所提出的使用相同材料的方法是测量低浓度氧化还原离子的有效手段，并有望有助于无参考电极的更小，更稳定的设备的制造。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。因此，所提出的使用相同材料的方法是测量低浓度氧化还原离子的有效手段，并有望有助于无参考电极的更小，更稳定的设备的制造。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。因此，所提出的使用相同材料的方法是测量低浓度氧化还原离子的有效手段，并有望有助于无参考电极的更小，更稳定的设备的制造。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。