title: Tunneling spectroscopy measurements on hydrogen-bonded supramolecular polymers.
abstract: We studied the formation of hydrogen-bonded supramolecular polymers of Ethyl Hexyl Urea Toluene (EHUT) on a gold (111) surface by low temperature scanning tunneling microscopy. Tunneling spectroscopy performed along an individual molecule embedded in a self-assembled layer revealed strong changes in the value of the HOMO-LUMO gap. A variation of the LUMO state is attributed to the effect of space charge accumulation resulting from anisotropic adhesion of the molecule. In addition, for specific tunneling conditions, changes induced through the formation of hydrogen bonds became visible in the differential conductance (dI/dV) maps; isolated molecules, hydrogen bonded dimers and supramolecular polymers of EHUT were distinguishable through their electronic properties.
authors.affiliation: Institut des Sciences de Matériaux de Mulhouse, CNRS-UMR 7361, Université de Haute Alsace, 3B, rue Alfred Werner, 68093 Mulhouse, France. Laurent.Simon@uha.fr.
authors.forename: François
authors.initials: F
authors.lastname: Vonau
authors.forename: Roozbeh
authors.initials: R
authors.lastname: Shokri
authors.forename: Dominique
authors.initials: D
authors.lastname: Aubel
authors.forename: Laurent
authors.initials: L
authors.lastname: Bouteiller
authors.forename: Olga
authors.initials: O
authors.lastname: Guskova
authors.forename: Jens-Uwe
authors.initials: JU
authors.lastname: Sommer
authors.forename: Günter
authors.initials: G
authors.lastname: Reiter
authors.forename: Laurent
authors.initials: L
authors.lastname: Simon