Electric-field-induced emergent electrical connectivity in graphene oxide

Research output: Contribution to journalArticle

  • Authors:
  • M. Neek-Amal
  • R. Rashidi
  • Rahul R. Nair
  • D. Neilson
  • F. M. Peeters

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.

Bibliographical metadata

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