Single-layer Pb²⁺ Potentiometric sensor with MoS₂ Nanoflakes as Ion-to-electron transducer

There is a growing interest in research on all-solid-state ion-selective-electrodes (ASS-ISEs), largely motivated by simplicity, fast analytical time, and low detection limit. In this paper we report on the construction, characterization and analytical application of an ASS-ISE made using MoS2 nanoflakes as ion-to-electron transducer. Ion-selective membrane components and MoS2 nanoflakes were dissolved together and formed single-layer electrode. The results demonstrate that the proposed electrode has a Nernstian response slope of 27 mV/decade over a wide concentration range of 1.0×10-3 to 5.1×10-8 mol/L, and a quick response time of shorter than 5 s. The selectivity and stability are sufficient for practical application, and an example of sample measurements is given.