title: Local voltage drop in a single functionalized graphene sheet characterized by Kelvin probe force microscopy.
abstract: We studied the local voltage drop in functionalized graphene sheets of subμm size under external bias conditions by Kelvin probe force microscopy. Using this noninvasive experimental approach, we measured ohmic current-voltage characteristics and an intrinsic conductivity of about 3.7 × 10(5) S/m corresponding to a sheet resistance of 2.7 kΩ/sq under ambient conditions for graphene produced via thermal reduction of graphite oxide. The contact resistivity between functionalized graphene and metal electrode was found to be <6.3 × 10(-7) Ωcm(2).
authors.affiliation: Werkstoffe der Elektrotechnik and CeNIDE, Universität Duisburg-Essen, 47057 Duisburg, Germany.
authors.forename: Liang
authors.initials: L
authors.lastname: Yan
authors.forename: Christian
authors.initials: C
authors.lastname: Punckt
authors.forename: Ilhan A
authors.initials: IA
authors.lastname: Aksay
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Mertin
authors.forename: Gerd
authors.initials: G
authors.lastname: Bacher