4.7 Article

A novel inorganic redox buffer of r-GO/Ag@AgCl/TMMCl utilized as an effective ion-to-electron transducer for a solid contact calcium ion-selective electrode

Journal

SENSORS AND ACTUATORS B-CHEMICAL
Volume 367, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132055

Keywords

Ion-selective electrode; Ion-to-electron transducer; Redox capacitance; Silver nanoparticles; Stability

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This study presents an optimized inorganic redox buffer of r-GO/Ag@AgCl/TMMCl for solid contact ion-selective electrodes, which greatly enhances capacitance and electron transfer, thus improving the efficiency of ion-to-electron conversion.
The Ag@AgCl/1-tetradecyl-3-methylimidazolium chloride (TMMCl) reported as an inorganic redox buffer for solid contact ion-selective electrodes (SC-ISEs) suffers from minimized specific area for an aggregation of Ag nanoparticles and decreased electron transfer for a presence of AgCl coating. Herein, a novel optimized inorganic redox buffer of r-GO/Ag@AgCl/TMMCl with improved capacitance and electron transfer behaving well as an effective ion-to-electron transducer for a SC-Ca2+-ISE has been highlighted. With reduced graphene oxide (r-GO) introduced as a substrate, the produced Ag nanoparticles as well as the subsequently synthesized core-shell Ag@AgCl nanomaterials display high dispersity with diameters decreased to 10-40 nm. Cyclic voltammetry with better redox reversibility and higher areas for the r-GO/Ag@AgCl/TMMCl verifies its improved redox capacitance and acceleration in electron transfer. Taking advantage of the r-GO/Ag@AgCl/TMMCl, the fabricated SC-Ca2+-ISE exhibits a near Nernst slope about 28.5 mV/dacade between potentials to Ca2+ concentrations ranging from 10-6 to 10-3M. Additionally, a diminished Rbc and Rct as well as an increased capacitance are also exemplified by the EIS and chronopotentiometric techniques, which would ensure a fast and stable potentiometric response. Moreover, the fabricated SC-Ca2+-ISE displays a good selectivity and water layer resistance. Thanks to the increased redox capacitance of the r-GO/Ag@AgCl/TMMCl, the fabricated SC-Ca2+-ISE demonstrates stable potentiometric response and good E0 reproducibility.

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