Organic Electrochemical Transistors as Versatile Analytical Potentiometric Sensors.

ABSTRACT: Potentiometric transduction is an important tool of analytical chemistry to record chemical signals, but some constraints in the miniaturization and low-cost fabrication of the reference electrode are a bottleneck in the realization of more-advanced devices such as wearable and lab-on-a-chip sensors. Here, an organic electrochemical transistor (OECT) has been designed with an alternative architecture that allows to record the potentiometric signals of gate electrodes, which have been chemically modified to obtain Ag/AgnX interfaces (X = Cl-, Br-, I-, and S2-), without the use of a reference electrode. When the OECT is immersed in a sample solution, it reaches an equilibrium state, because PEDOT:PSS exchanges charges with the electrolyte until its Fermi level is aligned to the one of Ag/Agn

SUBMITTER: Gualandi I 

PROVIDER: S-EPMC6882742 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature