The sensitivity and repeatability are crucial for the practical application of electrochemical sensors. Many studies have focused on sensing materials and electrode structure to enhance sensitivity and repeatability rather than insulating layers. In this paper, polyaniline (PANI) microelectrode arrays were prepared to explore the influence of the insulating layer on sensitivity and repeatability of electrochemical sensors. The effects of different types of insulating layers, the sizes of the electrodes, and the thicknesses of the insulating layers were studied by experiment and simulation. The research findings indicated that the kind of organic insulating layers (Polyimide (PI) and SU-8) did not have a significant effect on the performance of the sensors. However, as the electrode area increased, the PANI film deposited on the electrode exhibited improved uniformity and density, leading to significant improvements in sensitivity and repeatability of the sensors. Additionally, the thickness of the insulating layer also had a significant impact on the performance of the device. The microelectrode with thinner insulating layers exhibited improved performance in sensitivity, repeatability and signal-to-noise ratio. The research findings indicated that increasing the electrode size and reducing the thickness of the insulating layer led to a more uniform and dense PANI film, resulting in an array electrode that exhibits excellent performance and remarkable repeatability.

中文翻译：

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提高微电极电化学传感器灵敏度和可重复性的钝化策略

灵敏度和重复性对于电化学传感器的实际应用至关重要。许多研究都集中在传感材料和电极结构上，以提高灵敏度和可重复性，而不是绝缘层。本文制备了聚苯胺（PANI）微电极阵列，探讨绝缘层对电化学传感器灵敏度和重复性的影响。通过实验和模拟研究了不同类型绝缘层、电极尺寸和绝缘层厚度的影响。研究结果表明，有机绝缘层的种类（聚酰亚胺（PI）和SU-8）对传感器的性能没有显着影响。然而，随着电极面积的增加，沉积在电极上的PANI薄膜表现出更好的均匀性和密度，从而显着提高传感器的灵敏度和可重复性。此外，绝缘层的厚度也对器件的性能产生重大影响。具有更薄绝缘层的微电极在灵敏度、重复性和信噪比方面表现出改进的性能。研究结果表明，增加电极尺寸并减少绝缘层厚度可以使PANI薄膜更加均匀致密，从而使阵列电极表现出优异的性能和显着的重复性。