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Amplified oxadiazole derivative nano MgO–multiwall carbon nanotubes modified carbon paste electrode for the determination of dopamine in presence of morphine
Author(s) -
VafaeeShahi Shohre,
Shishehbore M. Reza,
Sheibani Ali,
Tabatabaee Masoumeh
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201900330
Subject(s) - chemistry , differential pulse voltammetry , chronoamperometry , detection limit , overpotential , cyclic voltammetry , carbon nanotube , electrochemical gas sensor , electrode , carbon paste electrode , analytical chemistry (journal) , electrochemistry , nuclear chemistry , nanotechnology , chromatography , materials science
In this paper, we report the fabrication of an amplified sensor to determine dopamine in the presence of morphine based on nano‐MgO, multiwall carbon nanotubes, and an oxadiazole derivative. The electrochemical behavior and electrocatalyic activity of the sensor toward the oxidation of dopamine were investigated. Cyclic voltammetry was used to study the redox features of the sensor, and the results have shown that dopamine overpotential oxidation at the surface of the sensor was reduced to nearly 460 mV. The diffusion coefficient was estimated by chronoamperometry. Three segmented linear dynamic ranges over the range 0.05–5175.0 and detection limit of 0.021 μM for the quantification of dopamine were obtained using differential pulse voltammetry (DPV). The modified nanocomposite carbon paste electrode, which showed excellent sensitivity, selectivity, repeatability, and reproducibility, was satisfactorily employed to determine dopamine and morphine in actual samples.