Potentiometric sensing of potassium ion (K+) using valinomycin supported on ZnO/rGO nanocomposites.
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| Title: | Potentiometric sensing of potassium ion (K+) using valinomycin supported on ZnO/rGO nanocomposites. |
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| Authors: | Tharini, C.1 (AUTHOR) tharini@crescent.education, Iyappan, G.2 (AUTHOR), Manikandan, E.3 (AUTHOR), Sephra, Percy J.1 (AUTHOR) |
| Source: | Journal of Materials Science: Materials in Electronics. Jul2023, Vol. 34 Issue 19, p1-12. 12p. |
| Abstract: | A solid-contact ion-selective electrode (ISE) was fabricated using zinc oxide/reduced graphene oxide (ZnO/rGO) nanocomposites as an intermediate layer between glassy carbon electrode (GCE) and ionophore. The resulting solid contact acts as an ion-to-electron transducer in potassium ion-selective electrode (K+-ISE) containing valinomycin as ionophore. The new transducing layer was characterized by using scanning electron microscopy (SEM), X-ray diffraction analysis, and cyclic voltammetry (CV) techniques. Hexagonal wurtzite phase of ZnO was revealed from diffraction analysis and the SEM images showed the formation of one-dimensional nanorods with hexagonal top surfaces. Validation of the sensing material was carried out using CV studies and the experimental studies showed that ZnO/rGO has a strong capability to function as a solid contact in the fabrication of K+-ISEs. Valinomycin-based ISE developed using ZnO/rGO showed a high sensitivity of 9.95 µA (µM)−1 cm− 2 with a faster response time of ~ 2 s and limit of detection (LOD) of 0.956 mM. Interference studies, reproducibility, and long-term stability of the sensing material toward K+ detection were assessed and the results showed that the ZnO/rGO redox capacitance is favorable for solid contact as K+-ISE for real-time application in soil analysis. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | A solid-contact ion-selective electrode (ISE) was fabricated using zinc oxide/reduced graphene oxide (ZnO/rGO) nanocomposites as an intermediate layer between glassy carbon electrode (GCE) and ionophore. The resulting solid contact acts as an ion-to-electron transducer in potassium ion-selective electrode (K+-ISE) containing valinomycin as ionophore. The new transducing layer was characterized by using scanning electron microscopy (SEM), X-ray diffraction analysis, and cyclic voltammetry (CV) techniques. Hexagonal wurtzite phase of ZnO was revealed from diffraction analysis and the SEM images showed the formation of one-dimensional nanorods with hexagonal top surfaces. Validation of the sensing material was carried out using CV studies and the experimental studies showed that ZnO/rGO has a strong capability to function as a solid contact in the fabrication of K+-ISEs. Valinomycin-based ISE developed using ZnO/rGO showed a high sensitivity of 9.95 µA (µM)−1 cm− 2 with a faster response time of ~ 2 s and limit of detection (LOD) of 0.956 mM. Interference studies, reproducibility, and long-term stability of the sensing material toward K+ detection were assessed and the results showed that the ZnO/rGO redox capacitance is favorable for solid contact as K+-ISE for real-time application in soil analysis. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09574522 |
| DOI: | 10.1007/s10854-023-10806-y |
