Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2898501
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We employ electrostatic force microscopy to study the electrostatic environment of graphene sheets prepared with the micromechanical exfoliation technique. We detect the electric dipole of residues left from the adhesive tape during graphene preparation, as well as the dipole of water molecules adsorbed on top of graphene. Water molecules form a dipole layer that can generate an electric field as large as similar to 10(9) Vm(-1). We expect that water molecules can significantly modify the electrical properties of graphene devices. (C) 2008 American Institute of Physics.
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