Feng S, Li Y, Zhang R, Li Y. A novel electrochemical sensor based on molecularly imprinted polymer modified hollow N, S-Mo
2C/C spheres for highly sensitive and selective carbendazim determination.
Biosens Bioelectron 2019;
142:111491. [PMID:
31326864 DOI:
10.1016/j.bios.2019.111491]
[Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/09/2019] [Accepted: 07/01/2019] [Indexed: 02/07/2023]
Abstract
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 1×10-12 ∼ 8×10-9 M with a detection limit of 6.7×10-13 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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