Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 304, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.127370
Keywords
Metal-organic frameworks; Er-BTC; Morphology; Electrochemical; detection; Azo dyes; Flavonoids
Funding
- National Natural Science Foundation of China [21775050, 21976062]
- National Basic Research Program of China (973 Program) [2015CB352100]
- Hubei Provincial Natural Science Fund for Distinguished Young Scholars [2016CFA039]
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Generally, materials with different morphologies are expected to have different electrochemical properties. Here, three kinds of erbium-based metal-organic frameworks with different morphologies were prepared using erbium nitrate and 1,3,5-benzenetricarboxylic acid (H3BTC) as the source in N, N-dimethylformamide (DMF) by adding various amounts of ammonium acetate (CH3COONH4). The characterization of X-ray diffraction, infrared spectroscopy and X-ray photoelectron spectroscopy proved that the obtained materials were Er-BTC. Scanning electron microscope measurements indicated that the amount of CH3COONH4 had obvious effects on the morphology. More importantly, the active sensing area and interface electron transfer ability of Er-BTC were controlled by the morphology, which revealed by rotating ring disk electrode and electrochemical impedance spectroscopy. Moreover, the prepared Er-BTC with different morphologies exhibited different signal enhancement ability toward the oxidation of azo dyes (allura red and rhodamine B) and flavonoids (quercetin and luteolin). Based on the morphology-controlled sensing of Er-BTC, a highly sensitive detection platform were developed for allura red/rhodamine B and quercetin/luteolin, with detection limits of 0.30/0.56 nM and 0.22/0.14 nM. Besides, this new method was successfully used in drink and tea samples, and the results were in good agreement with those obtained from high-performance liquid chromatography.
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