Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 97: Organic/bio Molecules on Metal Surfaces IV
O 97.10: Vortrag
Freitag, 4. April 2014, 12:45–13:00, TRE Phy
Planarized Cyano-Functionalized Triarylamines on Coinage Metal Surfaces: Intermolecular vs. Molecule/Substrate Interactions — •Kathrin Müller1, Stefano Gottardi1, Juan Carlos Moreno Lopez1, Handan Yildirim2, Ute Meinhardt3, Abdelkader Kara2, Milan Kivala3, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Department of Physics, University of Central Florida, Orlando, USA — 3Department of Chemistry and Pharmacy, University Erlangen-Nürnberg, Germany
The formation of well-ordered molecular networks on surfaces has gained increasing attention over the last decades due to their application in devices for molecular electronics. However, the intermolecular as well as the molecule/substrate interactions, which govern the self-assembly process, are often not well understood. We conducted a detailed study of a cyano-functionalized triarylamine molecule on different coinage metal surfaces. By using scanning tunneling microscopy and density functional theory studies we found that the substrates play a crucial role in the self-assembly process. While on Au(111) two different well-ordered phases with micrometer sized domains were found, on Cu(111) only small patches of close packed molecules were observed next to a disordered phase. In contrast only one close-packed phase with micrometer sized islands was found on Ag(111). This study shows that although coinage metal surfaces are considered to be passive they can strongly influence the molecular self-assembly, due to their different electronic and structural corrugation.