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Nanocomposites composed of layered molybdenum disulfide and graphene for highly sensitive amperometric determination of methyl parathion

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Abstract

The authors describe an inexpensive electrode for the sensitive amperometric determination of the pesticide methyl parathion. A glassy carbon electrode was modified with a nanocomposite consisting of molybdenum disulfide nanosheets (MoS2) and graphene that was prepared via a hydrothermal process. Its morphology, elemental composition, diffraction, impedance and voltammetric characteristics were studied. The modified electrode displays excellent electrocatalytic ability towards methyl parathion, and the reduction peak current, measured typically at −0.60 V (vs. Ag/AgCl) is related to the concentration of methyl parathion. The effect of concentration, scan rate and solution pH value were optimized. The calibration plot is linear in the 10 nM to 1.9 mM concentration range, with a 3.2 nM detection limit (at a signal-to-noise ratio of 3). The electrode is selective, stable, adequately repeatable and reproducible. The method was successfully applied to the determination of methyl parathion in spiked samples of homogenized apple, kiwi, tomato and cabbage.

A reliable and robust methyl parathion sensor has been developed using heterostructured MoS2/graphene. The linear range is 10 nM–1.9 nM and detection limit is 3.2 (±0.8) nM. The method was successful in real sample determination of spiked methyl parathion in food samples such as apple, kiwi, tomato and cabbage.

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Acknowledgements

This work was supported by the Ministry of Science and Technology, Taiwan.

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Authors and Affiliations

  1. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan, 106, Republic of China

    Mani Govindasamy, Shen-Ming Chen, Veerappan Mani, Muthumariappan Akilarasan & Sakthivel Kogularasu

  2. Graduate Institute of Biomedical and Biochemical Engineering, National Taipei University of Technology, Taipei, Taiwan, 106, Republic of China

    Veerappan Mani

  3. Research Center for Applied Sciences, Academia Sinica, Nangang, Taipei, 11529, Taiwan, Republic of China

    Boopathi Subramani

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  1. Mani Govindasamy
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  2. Shen-Ming Chen
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  3. Veerappan Mani
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  4. Muthumariappan Akilarasan
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  5. Sakthivel Kogularasu
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Correspondence to Shen-Ming Chen or Veerappan Mani.

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Govindasamy, M., Chen, SM., Mani, V. et al. Nanocomposites composed of layered molybdenum disulfide and graphene for highly sensitive amperometric determination of methyl parathion. Microchim Acta 184, 725–733 (2017). https://doi.org/10.1007/s00604-016-2062-6

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  • DOI: https://doi.org/10.1007/s00604-016-2062-6

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