title: Gap size dependent transition from direct tunneling to field emission in single molecule junctions.
abstract: I/V characteristics recorded in mechanically controllable break junctions revealed that field emission transport is enhanced in single molecule junctions as the gap size between two nanoelectrodes is reduced. This observation indicates that Fowler-Nordheim tunneling occurs not only for intermolecular but also for intramolecular electron transport driven by a reduced energy barrier at short tunneling distances.
authors.affiliation: Institute of Bio- and Nanosystems (IBN-2), Research Center Jülich, D-52425, Germany.
authors.forename: Dong
authors.initials: D
authors.lastname: Xiang
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Feliks
authors.initials: F
authors.lastname: Pyatkov
authors.forename: Andreas
authors.initials: A
authors.lastname: Offenhäusser
authors.forename: Dirk
authors.initials: D
authors.lastname: Mayer
mesh_terms: D000327:Adsorption; D004566:Electrodes; D006046:Gold / Q000737:chemistry; D010316:Particle Size; D013438:Sulfhydryl Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D013438:Sulfhydryl Compounds; D006046:Gold; C516316:1,8-octanedithiol