期刊
BIOSENSORS & BIOELECTRONICS
卷 142, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2019.111491
关键词
Molybdenum carbide; Carbon sphere; Nitrogen and sulfur doping; Molecular imprinting; Carbendazim detection; Pesticide residue
类别
资金
- National Natural Science Foundation of China [81773680]
- Innovation and entrepreneurship project for overseas high-level talents of Shenzhen [KQJSCX20180328165437711]
- Natural Science Foundation of Henan Province [182300410353]
A novel electrochemical sensor based on nitrogen and sulfur doped hollow Mo2C/C spheres (N, S-Mo2C) and molecularly imprinted polymer (MIP) was proposed for carbendazim (CBD) determination. The N, S-Mo2C were prepared by first nitrogen and sulfur doping via one-pot method and subsequent carbonization at high temperature. A film of MIP was then fabricated in situ on the N, S-Mo2C surface by electropolymerization, with CBD acting as template molecule and o-phenylenediamine as functional monomer. The N, S-Mo2C were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and electrochemical behaviors of CBD on differently modified electrodes were explored by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, a calibration curve of current shift versus the logarithm of CBD concentration was obtained in the range of 1 x 10(-12) similar to 8 x 10(-9) M with a detection limit of 6.7 x 10(-13) M (S/N =3). Moreover, the proposed sensor exhibited favorable stability and selectivity, and was applied to analyze pesticide residues in fruits and vegetables with decent accuracy.
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