Berlin 2008 – scientific programme
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.42: Poster
Tuesday, February 26, 2008, 14:30–20:00, Poster A
Co and Fe Adatoms in Biomolecular Nanotrenches: Control of Diffusion at the Atomic Scale and 1-D Nanotemplating — •Joachim Reichert1, Agustin Schiffrin2, Willi Auwärter1, Alexander Weber-Bargioni2, Agustin Schiffrin2, Yan Pennec2, Dean Cvetko3, Albano Cossaro3, Alberto Morgante3, Larissa Niebergall4, Valeri Stepanyuk4, and Johannes Barth1 — 1Physik Department E20, TU München, Munich, Germany — 2Departments of Chemistry and Physics & Astronomy, University of British Columbia, Vancouver, Canada — 3INFM/TASC, Trieste, Italy — 4MPI für Mikrostrukturphysik, Halle, Germany
We studied the self-assembly of the L-methionine amino acid on the noble metal Ag(111) surface under ultra-high vacuum conditions, by the means of low-temperature scanning tunneling microscopy and photoelectron spectroscopy (XPS). Molecular dimerization and self-assembly in 1-D nanostructures parallel to the <110> crystallographic orientations of the substrate atomic lattice is observed. Commensurate chains arrange into tunable and regular biomolecular gratings. An XPS analysis evidences zwitterionic self-assembly. The confinement of the surface state electrons was used to steer the positioning of single magnetic adatoms like Fe and Co in the molecular trenches at low temperatures. Also, the thermal motion of the transition metal atoms in the trenches was monitored in order to probe the influence of the adatom restriction on their diffusion characteristics and compared to 2-D particle movement.