A high-performance electrochemical sensor for sensitive detection of tetracycline based on a Zr-UiO-66/MWCNTs/AuNPs composite electrode

Xu, He; Weng, Xueyu; Huang, Jian; Ye, Huanzhu; Cai, Dongqing; Wang, Dongfang

doi:10.1039/d2ay00702a

Cited by 27 publications

(2 citation statements)

References 45 publications

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“…A pair of relatively weak redox peaks appears on the unmodified GCE with an anodic ( i pa ) and cathodic peak current ( i pc ) of 163.0 and −163.6 μA, indicating that the electrochemical kinetics of [Fe(CN) 6 ] 3–/4– is retarded. On the UiO-66/GCE, the redox peak current of the ferro-/ferrocyanide probe increases slightly ( i pa = 193.6 μA; i pc = −177.3 μA), mainly due to the compromise between its large adsorption capacity and poor electrical conductivity . After modification by the GCE with MWCNT-COOH, the redox peak current increases significantly ( i pa = 241.2 μA; i pc = −222.7 μA), which is attributed to the fact that MWCNT-COOH could provide higher conductivity and more electroactive sites for probe redox .…”

Section: Resultsmentioning

confidence: 99%

“…On the UiO-66/GCE, the redox peak current of the ferro-/ferrocyanide probe increases slightly (i pa = 193.6 μA; i pc = −177.3 μA), mainly due to the compromise between its large adsorption capacity and poor electrical conductivity. 50 After modification by the GCE with MWCNT-COOH, the redox peak current increases significantly (i pa = 241.2 μA; i pc = −222.7 μA), which is attributed to the fact that MWCNT-COOH could provide higher conductivity and more electroactive sites for probe redox. 47 As anticipated, a pair of sharp and robust redox peaks appears on the UiO-66/MWCNT-COOH/GCE with the maximum response peak current (i pa = 326.6 μA; i pc = −206.3 μA), demonstrating that their electrochemical properties were significantly improved.…”

Section: Accumulation Parametersmentioning

confidence: 95%

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UiO-66/Carboxylated Multiwalled Carbon Nanotube Composites for Highly Efficient and Stable Voltammetric Sensors for Gatifloxacin

Wan,

Du,

Tuo

et al. 2023

ACS Appl. Nano Mater.

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The excessive use of gatifloxacin (GAT) can seriously pollute the environment and damage human health. Therefore, reliable detection of its concentration is essential for environmental protection and physical health. Herein, an efficient and stable voltammetric sensor based on zirconium-based metal–organic framework/carboxylated multiwalled nanotube nanocomposites (UiO-66/MWCNT-COOH) was constructed for the determination of GAT. The morphologies, microstructures, and electrochemical properties of UiO-66/MWCNT-COOH were investigated by using various microscopic, spectroscopic, and electrochemical techniques. UiO-66/MWCNT-COOH showed good electrocatalytic activity for GAT oxidation with remarkable voltammetric response signals, which was primarily attributed to the synergistic effect from UiO-66 and MWCNT-COOH. Electrochemical kinetics studies revealed that the electrocatalytic oxidation of GAT is an irreversible and diffusion-limited reaction involving two protons and two electrons. The anodic peak current of GAT is linearly correlated with GAT concentration in the range from 0.05 to 10 μM with a low detection limit of 0.0075 μM. Moreover, UiO-66/MWCNT-COOH demonstrated high selectivity, reproducibility, and repeatability as well as extraordinary long-term stability (at least 7 weeks). The proposed UiO-66/MWCNT-COOH reliably detected trace GAT in the effluent, milk, human serum, and eye drops with satisfactory recoveries. Together with its outstanding merits such as low cost, robust response, short assay time, and good sensitivity, the proposed sensor shows enormous prospects for in situ determination of multiple antibiotics.

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Section: Resultsmentioning

confidence: 99%

Section: Accumulation Parametersmentioning

confidence: 95%