Park Hong Jun, Yoon Jo Hee, Lee Kyoung G, Choi Bong Gill
Department of Chemical Engineering, Kangwon National University, 346 Joongang-ro, Samcheok, Gangwon-do, 25913, Republic of Korea.
Nano-Bio Application Team, National NanoFab Center (NNFC), Daejeon, 34141, Republic of Korea.
Nano Converg. 2019 Mar 18;6(1):9. doi: 10.1186/s40580-019-0179-0.
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.
我们报道了一种基于聚苯胺纳米纤维阵列的pH传感器的电位性能，该传感器通过将稀化学聚合与低成本且简单的丝网印刷工艺相结合制备而成。该pH传感器具有双电极配置，由聚苯胺纳米纤维阵列传感电极和Ag/AgCl参比电极组成。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。该pH传感器表现出优异的传感器性能，灵敏度为62.4 mV/pH，重复性为97.9%保持率，响应时间为12.8 s，耐久性为3.0 mV/h。该pH传感器还可以测量牛奶变质时的pH变化，这与商用pH计的测量结果相似。该pH传感器具有高度的柔韧性，因此可以测量苹果曲面上的水果腐烂情况。这种灵活且微型的pH传感器为水、产品过程、人类健康以及化学（或生物）反应的监测开辟了新的机会，甚至可以使用少量样品进行监测。
