A chemically modified field-effect transistor (CHEMFET) with satisfactory Ag+ selectivity is described. The potentiometric Ag+ selectivities of CHEMFETs with plasticized PVC membranes based on macrocyclic thioethers have been determined. All the macrocyclic thioethers tested showed silver response and a selectivity towards Ag + and Hg2+ versus other interfering cations. The highest Ag+ selectivity was obtained for a 14-membered cyclic tetrathioether with an exocyclic methylene group.
Brzozka, Z., Cobben, P. L. H. M., Cobben, P. L. H. M., Reinhoudt, D., Edema, J. J. H., Buter, J., & Kellogg, R. M. (1993). Chemically modified field-effect transistors, potentiometric Ag$#+$# selectivity of PVC membranes based on macrocyclic thioethers. Analytica chimica acta, 273(1-2), 139-144. https://doi.org/10.1016/0003-2670(93)80152-B