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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.42: Poster

Dienstag, 26. Februar 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.