Development of Solid-Contact Potentiometric Sensor Utilized Nanocarbon-filled Poly (vinyl chloride) Membrane as Ion-to-electron Transducing Layer

Current fundamental researches in the field of potentiometry demonstrate perspectives using polymeric nanostructured materials as ion-to-electron transducers Solid-Contact Potentiometric Sensors (SCSs). This paper reports preparation and comparative study plasticized Poly(Vinyl Chloride) (PVC) membranes modified with fullerene C60, single-walled carbon nanotubes SWCNTs, multiwalled nanotubes, graphene oxide transducing layer SCSs for determination a common local anesthetic drug – procaine hydrochloride (Pro·HCl). As an ion-sensitive (recognizing) layer, PVC membrane containing highly lipophilic 2-[bis-octadecyl sulfo]-closo-decaborate anions was chosen. The results were discussed relation to nanofiller’s type content. best potentiometric characteristics obtained sensor hybrid nanofiller SWCNTs/C60. new double-layer configuration exhibited Nernstian slope (59.2 ± 0.2 mV/decade) wide linear range (5×10-7– 1×10-2 M) low limit detection (10-7.1 M), fast response time (≤ 7 s), stable (drift potential 0.27 mV h-1 over h soaking 1x10-5 M Pro·HCl solution).