Potentiometric performance of flexible pH sensor based on polyaniline nanofiber arrays

• DOI: 10.1186/s40580-019-0179-0
• Publication Date: 2019-03-18T00:02:30Z
• Authors: Hong Jun Park; Jo Hee Yoon; Kyoung G. Lee; Bong Gill Choi
• Keywords: Potentiometric sensor; pH meter; Electromotive force; Polyaniline nanofibers; Repeatability; Electrochemical gas sensor

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