High performance flexible pH sensor based on polyaniline nanopillar array electrode

Hee Yoon, Jo; Bok Hong, Seok; Yun, Seok-Oh; Jae Lee, Seok; Jae Lee, Tae; Lee, Kyoung G.; Gill Choi, Bong

High performance flexible pH sensor based on polyaniline nanopillar array electrode

2016

Flexible pH sensor technologies have attracted a great deal of attention in many applications, such as, wearable health care devices and monitors for chemical and biological processes. Here, we fabricated flexible and thin pH sensors using a two electrode configuration comprised of a polyaniline nanopillar (PAN) array working electrode and an Ag/AgCl reference electrode. In order to provide nanostructure, soft lithography using a polymeric blend was employed to create a flexible nanopillar backbone film. Polyaniline-sensing materials were deposited on a patterned-nanopillar array by electrochemical deposition. The pH sensors produced exhibited a near-Nernstian response (∼ 60.3 mV/pH), which was maintained in a bent state. In addition, pH sensors showed other excellent sensor performances in terms of response time, reversibility, repeatability, selectivity, and stability.

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