Morphology-controlled Electrochemical Sensing of Erbium- Benzenetricarboxylic Acid Frameworks for Azo Dyes and Flavonoids
Sensors and actuators B, Chemical(2020)
摘要
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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关键词
Metal-organic frameworks,Er-BTC,Morphology,Electrochemical,detection,Azo dyes,Flavonoids
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