Au-Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron modified electrode for electrochemical determination of quercetin

A core-shell ZIF-8@ZIF-67 was synthesized and pyrolyzed to get a Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron (Co@NCNHP). Then Au nanoparticles were formed on the surface and core of Co@NCNHP to obtain an Au-Co bimetal decorated NCNHP (Au-Co@NCNHP). The resultant nanocomposite...

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Bibliographic Details
Published in:Mikrochimica acta (1966) 2020-10, Vol.187 (10), p.546-546, Article 546
Main Authors: Luo, Guiling, Deng, Ying, Zhu, Lin, Liu, Juan, Zhang, Bingxue, Zhang, Yan, Sun, Wei, Li, Guangjiu
Format: Article
Language:English
Subjects:
Analytical Chemistry
Bimetals
Carbon
Carbon nanotubes
Characterization and Evaluation of Materials
Chemical sensors
Chemistry
Chemistry and Materials Science
Cobalt
Diffraction
Electric properties
Electron microscopy
Electrons
Fourier transforms
Gold
Infrared spectroscopy
Microengineering
Microscopy
Nanochemistry
Nanocomposites
Nanoparticles
Nanotechnology
Nanotubes
Original Paper
Oxidation
Photoelectrons
Polyhedra
Spectrum analysis
X-ray spectroscopy
X-rays
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Summary:A core-shell ZIF-8@ZIF-67 was synthesized and pyrolyzed to get a Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron (Co@NCNHP). Then Au nanoparticles were formed on the surface and core of Co@NCNHP to obtain an Au-Co bimetal decorated NCNHP (Au-Co@NCNHP). The resultant nanocomposite was characterized by various methods including transmission electron microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The Au-Co@NCNHP-based electrochemical sensor displayed an obviously high electrocatalytic response to the oxidation of quercetin, which was attributed to the synergistic effects of Au-Co bimetal nanoparticles and N-doped carbon nanotube with hollow polyhedron. Under the optimal conditions, the oxidation peak currents exhibited a wide linear dynamic range for quercetin concentration from 0.050 to 35.00 μmol/L, and the detection limit was 0.023 ± 0.002 μmol/L (S/ N  = 3). The analytical applications of the proposed electrochemical sensor were checked by determining the content of quercetin in medical and onion samples with satisfactory results. Grapical abstract
ISSN:0026-3672
1436-5073
DOI:10.1007/s00604-020-04531-0