title: Electrical conduction mechanism in chemically derived graphene monolayers.
abstract: We have performed a detailed study of the intrinsic electrical conduction process in individual monolayers of chemically reduced graphene oxide down to a temperature of 2 K. The observed conductance can be consistently interpreted in the framework of two-dimensional variable-range hopping in parallel with electric-field-driven tunneling. The latter mechanism is found to dominate the electrical transport at very low temperatures and high electric fields. Our results are consistent with a model of highly conducting graphene regions interspersed with disordered regions, across which charge carrier hopping and tunneling are promoted by strong local electric fields.
authors.affiliation: MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.
authors.forename: Alan B
authors.initials: AB
authors.lastname: Kaiser
authors.forename: Cristina
authors.initials: C
authors.lastname: Gómez-Navarro
authors.forename: Ravi S
authors.initials: RS
authors.lastname: Sundaram
authors.forename: Marko
authors.initials: M
authors.lastname: Burghard
authors.forename: Klaus
authors.initials: K
authors.lastname: Kern