Journal
IONICS
Volume 27, Issue 3, Pages 1339-1345Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-020-03857-2
Keywords
Dopamine; Metal-organic framework; Electrochemical sensing; Ionic liquid; Modified electrode
Funding
- Young Scholars Program of Shandong University
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The Ni-MOF modified electrode fabricated by ionothermal synthesis method showed improved electrochemical sensing performance towards dopamine with a wide linear range and low detection limit. It exhibited great selectivity to dopamine in complex mixtures, excellent stability, and reproducibility. Analysis of real samples confirmed the electrode's reliability.
A Ni-based metal-organic framework (Ni-MOF) modified electrode was fabricated for electrochemical detection of dopamine. The Ni-MOF was synthesized by ionothermal synthesis method using an ionic liquid as a template. The morphology and composition of the Ni-MOF were characterized by scanning electron microscope, X-ray diffraction, thermogravimetric analysis, and attenuated total reflection Fourier transform infrared spectroscopy. Electrochemical responses of the Ni-MOF modified electrode toward dopamine were performed using differential pulse voltammetry. The electrochemical sensing performance of the Ni-MOF modified electrode toward dopamine was improved by the introduction of ionic liquid with a wide linear range (0.2-100 mu mol L-1), and a low detection limit (60 nmol L-1). Further studies indicated that the modified electrode exhibited great selectivity to dopamine in complex mixtures, and the Ni-MOF modified electrode also has excellent stability and reproducibility. Moreover, the analysis of real samples confirmed that the modified electrode has a certain reliability.
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