Gold Plate Electrodes Functionalized by Multiwall Carbon Nanotube Film for Potentiometric Thallium(I) Detection

Overview

Journal Nanomaterials (Basel)

Date 2019 Aug 17

PMID 31416119

Citations 1

Authors

Saad S M Hassan

Sabah M Abdelbasir

M Abdelwahab Fathy

Abd El-Galil E Amr

Mohamed A Al-Omar

Ayman H Kamel

Affiliations

Soon will be listed here.

Abstract

Solid-contact potentiometric ion-selective electrodes (SC-ISEs) for thallium determination have been designed using multiwall carbon nanotubes (MWCNTs) as the ion-to-electron transducer. Dispersed MWCNTs were drop-casted over a gold plate electrode. Two different crown ethers were used in the sensing membrane for the recognition of thallium (I). Sensorsbased on dibenzo-18-crown-6 (DB18C6) as a neutral carrier and NaTPB as an anionic additive exhibited a near Nernstian response of 57.3 mV/decade towards Tl ions over the activity range 4.5 × 10-7.0 × 10 M, with a limit of detection of 3.2 × 10 M. The time required to achieve 95% of the steadyequilibrium potential was <10 s. The complex formation constant (log ) between dibenzo-18-crown-6 and thallium (I) (i.e., 5.99) was measured using the sandwich membrane technique. The potential response was pH independent over the range 3.0-9.5. The introduction of MWCNTs as an electron-ion-transducer layer between gold plate and the sensing membrane lead to a smaller membrane resistance and a large double layer capacitance, which was proven using impedance spectra and chronopotentiometry (i.e., 114.9 ± 12 kΩ, 52.1 ± 3.3 pF, 200 ± 13.2 kΩ, and 50 ± 4.2 µF). Additionally, reduction ofthe water layer between the sensing membrane and the underlying conductor wastested. Thus, it is clear that MWCNTs can be used as a transducing layer in SC-ISEs. The proposed sensor was introduced as an indicator electrode for potentiometric titration of single and ternary mixtures of I, Br, and S anions.

Citing Articles

Novel paper-based potentiometric combined sensors using coumarin derivatives modified with vanadium pentoxide nanoparticles for the selective determination of trace levels of lead ions.

Hassan S, Fathy M Mikrochim Acta. 2024; 191(7):427.

PMID: 38935135 DOI: 10.1007/s00604-024-06494-y.

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