A novel electrochemical sensor based on molecularly imprinted polymer modified hollow N, S-Mo2C/C spheres for highly sensitive and selective carbendazim determination.
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.
['Feng|Shuxiao|S|', 'Li|Yangguang|Y|', 'Zhang|Ruyue|R|', 'Li|Yingchun|Y|']
D001562:Benzimidazoles D015374:Biosensing Techniques D002219:Carbamates D058266:Dielectric Spectroscopy D055664:Electrochemical Techniques D004566:Electrodes D005638:Fruit D057230:Limit of Detection D054802:Molecular Imprinting D008982:Molybdenum D009584:Nitrogen D010575:Pesticides D010655:Phenylenediamines D011108:Polymers D013455:Sulfur D014675:Vegetables
Nitrogen and sulfur doping Pesticide residue Carbendazim detection Carbon sphere Molecular imprinting Molybdenum carbide