Abstract
The authors describe the synthesis, characterization and electrochemical sensing performance of a PrFeO3-MoS2 nanocomposite. Graphene-like MoS2 sheets and a perovskite-type PrFeO3 were synthesized via a hydrothermal and a sol-gel method, respectively. Finally, PrFeO3-MoS2 nansheets were synthesized by using sodium molybdate as a source for molybdenum and thiourea as the source for sulfur. The nansheets were characterized by transmission electron microscopy and X-ray diffraction. The electrochemical behavior of the nanosheets deposited on a glassy carbon electrode was studied via electrochemical impedance spectroscopy and cyclic voltammetry. The modified electrodes display strong response to nitrite. At a scan rate of 100 mV·s−1, the current at the oxidation peak at 0.85 V (vs. SCE) increases linearly in the 0.005 to 3 mM nitrite concentration range. The detection limit is 1.67 μmol·L−1 (S/N = 3). The sensor is selective, stable and reproducible. It was successfully applied to the determination of nitrite in (spiked) real samples, and appropriate recoveries were obtained.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 21465013, 21005034 and 21501077), China Postdoctoral Science Foundation (Grant Nos. 2014 M551550) and Qingjiang Excellent Young Talents Program of Jiangxi University of Science and Technology.
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Huang, H., Lv, L., Xu, F. et al. PrFeO3-MoS2 nanosheets for use in enhanced electro-oxidative sensing of nitrite. Microchim Acta 184, 4141–4149 (2017). https://doi.org/10.1007/s00604-017-2446-2
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DOI: https://doi.org/10.1007/s00604-017-2446-2