We report potentiometric performance of a polyaniline nanofiber array-based pH sensor fabricated by combining a dilute chemical polymerization and low-cost and simple screen printing process. The pH sensor had a two-electrode configuration consisting of polyaniline nanofiber array sensing electrode and Ag/AgCl reference electrode. Measurement of electromotive force between sensing and reference electrodes provided various electrochemical properties of pH sensors. The pH sensor show excellent sensor performances of sensitivity of 62.4 mV/pH, repeatability of 97.9% retention, response time of 12.8 s, and durability of 3.0 mV/h. The pH sensor could also measure pH changes as the milk is spoiled, which is similar to those of a commercial pH meter. The pH sensors were highly flexible, and thus can measure the fruit decay on the curved surface of an apple. This flexible and miniature pH sensor opens new opportunities for monitoring of water, product process, human health, and chemical (or bio) reactions even using small volumes of samples.

中文翻译：

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基于聚苯胺纳米纤维阵列的柔性pH传感器的电位测量性能。

我们报告了通过结合稀化学聚合和低成本和简单的丝网印刷工艺制造的基于聚苯胺纳米纤维阵列的pH传感器的电位测量性能。pH传感器具有由聚苯胺纳米纤维阵列传感电极和Ag / AgCl参比电极组成的两电极配置。测量传感电极和参比电极之间的电动势可提供pH传感器的各种电化学特性。pH传感器具有出色的传感器性能，灵敏度为62.4 mV / pH，保留重复性为97.9％，响应时间为12.8 s，耐久性为3.0 mV / h。pH传感器还可以测量牛奶变质时的pH变化，这与商用pH计相似。pH传感器非常灵活，从而可以测量苹果曲面上的水果腐烂。这种灵活而微型的pH传感器，即使使用少量样品，也为监测水，产品过程，人体健康和化学（或生物）反应提供了新的机会。