Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 97: Nanostructures at Surfaces: Molecular Systems II
O 97.11: Talk
Thursday, March 23, 2017, 18:00–18:15, REC/PHY C213
The role of intrinsic vs. extrinsic adatoms for the formation of metal-organic structures from triphenylenehexamine: A comparative STM study on Ag(111) vs. Cu (111) — •Matthias Lischka1, Renhao Dong2, Massimo Fritton1, Wolfgang M. Heckl1,3, Xinliang Feng2, and Markus Lackinger1,3 — 1Department of Physics, TU München, James-Franck-Str. 1, 85748 Garching — 2Department of Chemistry and Food Chemistry, and Center for Advancing Electronics TU Dresden, 01062 Dresden — 3Deutsches Museum, Museumsinsel 1, 80538 München
The thermally activated formation of metal-organic structures of triphenylenehexamine (THA) is comparatively studied on Ag(111) and Cu(111) under ultra high vacuum conditions. The structural characterization of each phase is carried out by high resulotion scanning tunneling microscopy. On both pristine surfaces THA is initially partly deprotonated and directly forms metal-organic structures. On Ag(111) densely packed structures were observed, whereas on Cu(111) Cu-adatom coordinated hexamers were found. Upon progressive heating on Ag(111) no further structural change was observed until the desorption of THA. On Cu(111), however, further heating drives deprotonation of THA and results in a conversion of the Cu-adatom coordinated hexamers into trimers. A profound change was found on Ag(111) after additional deposition of Ni-atoms: moderate heating leads to porous networks that collapse into a more densely packed structure after annealing at higher temperatures.