4.7 Article

An electrochemical impedimetric platform formed by a CNT@UiO-66 nanocomposite for quantitative analysis of oxytetracycline

Journal

DALTON TRANSACTIONS
Volume 52, Issue 33, Pages 11552-11557

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d3dt01980b

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In this study, a CNT@UiO-66 composite was prepared by assembling the microporous Zr-MOF UiO-66 with carbon nanotubes (CNTs). The composite exhibited high surface area, excellent stability, good electrical conductivity, and abundant Zr(iv) sites, making it highly suitable for fabricating high-performance electrochemical aptasensors. The fabricated sensor based on CNT@UiO-66 showed fine stability, excellent selectivity, and reproducibility, and could quantitatively detect the concentration of oxytetracycline (OTC) in real samples.
Functional materials are considered one of the most critical factors in constructing high-performance electrochemical aptasensors in the sensing field. In this work, the microporous Zr-MOF UiO-66 (UiO = Universitetet i Oslo) is selected for assembly with carbon nanotubes (CNTs) to prepare a CNT@UiO-66 composite. The as-synthesized CNT@UiO-66 composite has a high surface area, excellent stability, good electrical conductivity, and abundant Zr(iv) sites, conferring it great potential for application in fabricating high-performance electrochemical aptasensors. It is gratifying that this electrochemical impedimetric aptasensor can detect trace oxytetracycline (OTC) from 0.01 to 0.7 pg mL(-1) with a low limit of detection (LOD) of 1.48 fg mL(-1). Meanwhile, this fabricated sensor based on CNT@UiO-66 has fine stability, excellent selectivity, and available reproducibility. In particular, the CNT@UiO-66-based aptasensor can quantitatively detect the OTC concentration in real samples.

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