Imprinted nanobead-based disposable screen-printed potentiometric sensor for highly sensitive detection of 2-naphthoic acid

Abstract Currently, potentiometric sensors based on various molecularly imprinted polymer (MIP) receptors have been successfully fabricated for detection of organic species. However, almost all of the previously developed potentiometric sensors based on MIPs are in traditional liquid-contact mode in which lower detection limits have been restricted by zero-current transmembrane ion fluxes. Herein, a screen-printed potentiometric sensor for determination of 2-naphthoic acid has been developed. It is based on the MIP nanobeads as the selective receptor and the electrochemically reduced graphene oxide film as the solid contact. Compared with the classical potentiometric sensor, the proposed sensor based on nonequilibrium sensing mechanism exhibits remarkably improved detection sensitivity for 2-naphthoic acid with a low detection limit of 6.9 × 10 −11  M.