Using MoS2/Fe3O4 as Ion-Electron Transduction Layer to Manufacture All-Solid-State Ion-Selective Electrode for Determination of Serum Potassium

As an essential electrolyte for the human body, potassium ion (K+) plays many physiological roles in living cells, so rapid and accurate determination of serum K+ is great significance. In this work, we developed a solid-contact ion-selective electrode (SC-ISE) using MoS2/Fe3O4 composites as ion-to-electron transducer to determine K+. The potential response measurement MoS2/Fe3O4/K+-ISE shows Nernst by slope 55.2 ± 0.1 mV/decade low detection limit 6.3 × 10?6 M. proposed exhibits outstanding resistance interference O2, CO2, light, water layer formation. Remarkably, it also presents high performance reproducibility long-term stability.