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    Porous Graphene Oxide–Metal Ion Composite for Selective Sensing of Organophosphate Gases
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    • Nitzan Shauloff
      Nitzan Shauloff
      Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
      More by Nitzan Shauloff
    • Nagappa L. Teradal
      Nagappa L. Teradal
      Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
      More by Nagappa L. Teradal
    • Raz Jelinek*
      Raz Jelinek
      Department of Chemistry, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
      Ilse Katz Institute for Nanotechnology, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
      *Email: [email protected]. Fax: (+) 972-8-6472943.
      More by Raz Jelinek
      Orcidhttp://orcid.org/0000-0002-0336-1384
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    ACS Sensors

    Cite this: ACS Sens. 2020, 5, 6, 1573–1581
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    https://doi.org/10.1021/acssensors.9b02367
    Published May 25, 2020
    Copyright © 2020 American Chemical Society
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    Abstract

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    Organophosphates are used as agricultural pesticides and also encountered as toxic nerve agents in chemical warfare. Accordingly, development of sensors for detecting and monitoring organophosphate vapors is highly sought after. We present a new capacitive gas sensor exhibiting remarkable specificity and sensitivity toward the organophosphate nerve gas simulants triethyl-phosphate (TEP) and dimethyl methyl phosphate and the pesticide dichlorvos. Specifically, the capacitive sensor comprises a composite porous graphene oxide matrix intercalating cobalt or nickel ions, prepared through a simple freeze-drying procedure. We demonstrate that the porous graphene oxide/metal ion electrode undergoes fast capacitance changes only upon exposure to organophosphate vapors. Moreover, the sensor exhibits extraordinary sensitivity upon interactions with TEP. Detailed mechanistic analyses, carried out in comparison to porous graphene oxide coupled to other transition metal ions, reveal that the remarkable sensing properties of the Co2+ or Ni2+/porous graphene oxide systems likely arise from the distinct mode of metal ion incorporation into the graphene oxide host matrix and substitution of metal-complexed water ligands with organophosphate molecules. The new metal ion/porous graphene oxide capacitive sensor may be employed for alerting and monitoring organophosphate gases in different environments.

    Copyright © 2020 American Chemical Society

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acssensors.9b02367.

    • Gas-sensing experimental setup, pGO–Co2+ EDS results, electrode SEM images with pGO–Mn+ derivatives, XPS spectra, table of the capacitance response values of all electrodes for the different analytes, Raman spectra of pGO and all pGO–Mn+, and TGA (PDF)

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    ACS Sensors

    Cite this: ACS Sens. 2020, 5, 6, 1573–1581
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acssensors.9b02367
    Published May 25, 2020
    Copyright © 2020 American Chemical Society
    Request reuse permissions

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