Charging and discharging of graphene in ambient conditions studied with scanning probe microscopy

A. Verdaguer, M. Cardellach, J. J. Segura, G. M. Sacha, J. Moser, M. Zdrojek, A. Bachtold, J. Fraxedas

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    49 Citations (Scopus)

    Abstract

    By means of scanning probe microscopy we are able to inject charges in isolated graphene sheets deposited on SiO2 /Si wafers and characterize the discharge induced by water in controlled ambient conditions. Contact potential differences between the graphene surface and the probe tip, measured by Kelvin probe microscopy, show a linear relationship with the tip bias during charge injection. The discharge depends on relative humidity and decays exponentially with time constants of the order of tens of minutes. We propose that graphene discharges through the water film adsorbed on the SiO2 surface. © 2009 American Institute of Physics.
    Original languageEnglish
    Article number233105
    JournalApplied Physics Letters
    Volume94
    Issue number23
    DOIs
    Publication statusPublished - 26 Jun 2009

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