Electric-field-induced emergent electrical connectivity in graphene oxide

M. Neek-Amal, R. Rashidi, Rahul R. Nair, D. Neilson, F. M. Peeters

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Understanding the appearance of local electrical connectivity in liquid filled layered graphene oxide subjected to an external electric field is important to design electrically controlled smart permeable devices and also to gain insight into the physics behind electrical effects on confined water permeation. Motivated by recent experiments [K. G. Zhou et al. Nature (London) 559, 236 (2018)NATUAS0028-083610.1038/s41586-018-0292-y], we introduce a new model with random percolating paths for electrical connectivity in micron thick water filled layered graphene oxide, which mimics parallel resistors connected across the top and bottom electrodes. We find that a strong nonuniform radial electric field of the order ∼10-50 mV/nm can be induced between layers depending on the current flow through the formed conducting paths. The maxima of the induced fields are not necessarily close to the electrodes and may be localized in the middle region of the layered material. The emergence of electrical connectivity and the associated electrical effects have a strong influence on the surrounding fluid in terms of ionization and wetting which subsequently determines the permeation properties.

    Original languageEnglish
    Article number115425
    JournalPhysical Review B
    Volume99
    Issue number11
    Early online date19 Mar 2019
    DOIs
    Publication statusPublished - 2019

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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