Abstract Light addressable potentiometric sensor (LAPS) is a flexible addressable potential sensor with many advantages including simple structure, high sensitivity, low manufacturing cost and light addressability. It can help us to achieve a high performance and low cost of LAPS to combine well-ordered polystyrene (PS) colloidal monolayer with fabricating of LAPS. This paper presents an alcohol-assisted interfacial fabrication method for fabricating low-cost, large-scale and well-ordered PS colloidal monolayer for LAPS in a simple laboratory. The effects of dispersants on PS colloidal self-assembly monolayer are investigated. The mechanism of well-ordered PS colloidal monolayer fabricated with methyl alcohol as the dispersant and the mechanism of disordered PS colloidal monolayer fabricated with ethyl alcohol as the dispersant are described in detail. The PS colloidal monolayer as a template, is used in fabrication of honeycomb meshed array working electrode to optimize performance of LAPS. Moreover, it is proved that the area ratio of the honeycomb meshed array to the silicon substrate is a constant which is independent of the diameter of the PS colloidal sphere. LAPS with honeycomb meshed array has an acceptable sensitivity of 53.47 mV/pH and high linearity of 99.8% in the measurement of pH. The change of photocurrent is also compared deeply for optimization. The results show that LAPS with honeycomb meshed array can reduce signal crosstalk between the detection points and improve addressability of LAPS.

中文翻译：

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用于光寻址电位传感器的有序聚苯乙烯胶体球

摘要 光可寻址电位传感器（LAPS）是一种灵活的可寻址电位传感器，具有结构简单、灵敏度高、制造成本低和光可寻址等优点。将有序聚苯乙烯 (PS) 胶体单层与 LAPS 的制造相结合，可以帮助我们实现高性能和低成本的 LAPS。本文提出了一种醇辅助界面制造方法，用于在简单的实验室中制备用于 LAPS 的低成本、大规模和有序的 PS 胶体单层。研究了分散剂对PS胶体自组装单层的影响。详细阐述了以甲醇为分散剂制备有序PS胶体单层的机理和以乙醇为分散剂制备无序PS胶体单层的机理。PS胶体单层作为模板，用于制造蜂窝网状阵列工作电极以优化LAPS的性能。此外，证明了蜂窝网状阵列与硅基板的面积比是一个常数，与PS胶体球的直径无关。具有蜂窝网状阵列的 LAPS 在 pH 测量中具有 53.47 mV/pH 的可接受灵敏度和 99.8% 的高线性度。对光电流的变化也进行了深度比较以进行优化。