Cu-based metal-organic framework HKUST-1 as effective catalyst for highly sensitive determination of ascorbic acid

Cu-based metal-organic framework HKUST-1 as effective catalyst for highly sensitive determination of ascorbic acid

In this work, a Cu-based nanosheet metal-organic framework (MOF), HKUST-1, was synthesised using a solvent method at room temperature. Its morphology, structure and composition were characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (...

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Bibliographic Details
Published in:RSC advances Vol. 1; no. 39; pp. 22881 - 2289
Main Authors: Shen, Tianyang, Liu, Tianchen, Mo, Hanqi, Yuan, Zichen, Cui, Feng, Jin, Yixiang, Chen, Xiaojun
Format: Journal Article
Language:English
Published: England Royal Society of Chemistry 16-06-2020
The Royal Society of Chemistry
Subjects:
Amino acids
Ascorbic acid
Atomic force microscopy
Chemical analysis
Chemistry
Copper
Dopamine
Electrochemical oxidation
Electron microscopy
Electron transfer
Fourier transforms
Indium tin oxides
Metal-organic frameworks
Microscopy
Morphology
Nanostructure
Nitrogen
Oxidation
Raman spectroscopy
Room temperature
Spectrum analysis
Uric acid
X ray powder diffraction
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Summary:In this work, a Cu-based nanosheet metal-organic framework (MOF), HKUST-1, was synthesised using a solvent method at room temperature. Its morphology, structure and composition were characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), powder X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman spectroscopy, nitrogen adsorption and desorption isotherms, energy dispersive X-ray spectroscopy (EDS) and elemental analysis (EA). This material was then loaded onto the surface of an indium tin oxide (ITO) electrode to catalyse the electrochemical oxidation of ascorbic acid (AA). An equal-electron-equal-proton reaction was deduced from the pH investigation, and a diffusion-controlled process was reinforced by the dynamics study. Under optimal conditions, the oxidation peak current at +0.02 V displayed a linear relationship with the concentration of AA within the ranges of 0.01-25 and 25-265 mM, respectively. The limit of detection (LOD) was 3 μM at S/N of 3. The superb response could be ascribed to the porous nanosheet structure of HKUST-1, which enhanced both the effective surface area and the electron transfer ability significantly. Moreover, the novel AA sensor demonstrated good reproducibility, favourable stability and high sensitivity towards glucose, uric acid (UA), dopamine (DA) and several amino acids. It was also successfully applied to the real sample testing of various AA-containing tablets. In this work, a Cu-based nanosheet metal-organic framework (MOF), HKUST-1, was synthesised using a solvent method at room temperature and it demonstrated high capability and sensitivity towards the oxidation of ascorbic acid (AA).
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ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra01260b