Journal
ANALYTICA CHIMICA ACTA
Volume 935, Issue -, Pages 104-112Publisher
ELSEVIER
DOI: 10.1016/j.aca.2016.07.012
Keywords
NiCo2O4; Reduced graphene oxide; Ionic liquid; Electrochemical sensor; Fungicide pyrimethanil
Categories
Funding
- General project of scientific research of the Education Department of Liaoning Province [L2015206]
- Science and Technology Foundation of Ocean and Fisheries of Liaoning Province [201408, 201406]
- Foundation of 211 project for Innovative Talent Training, Liaoning University
- Foundation for Young Scholars of Liaoning University [LDQN201434]
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The novel hierarchical flower-like superstructure NiCo2O4/reduced graphene oxide (rGO) hybrids have been successfully synthesized with a facile one-step hydrothermal process for the determination of fungicide pyrimethanil (PMT). For comparison, various structures of NiCo2O4/rGO including hexagonal nanoplates and nanorods were also synthesized. Among them, three-dimensional (3D) flower-like NiCo2O4/rGO exhibited the highest electrocatalytic activity for the oxidation of PMT. With the synergistic effect of [OMIM]PF6 ionic liquid (IL), the electrochemical sensor film (NiCo2O4/rGO/IL) further facilitated interfacial electron transfer and enhanced electrocatalytic activity for the oxidation of PMT. Under the optimum conditions, the electrochemical sensor exhibited two linear ranges of 0.1-10.0 mu mol/L and 20.0-140 mu mol/L for PMT with a low detection concentration of 11.0 nmol/L. Besides, the interference, repeatability, reproducibility and stability measurements were also evaluated. The proposed method was successfully applied to the detection of PMT in water, seawater, fruits and vegetables with good recovery ranging from 93% to 105%, and possessed potential applications in the analysis of real samples. (C) 2016 Elsevier B.V. All rights reserved.
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