Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Adsorption on Metal Surfaces
O 17.4: Vortrag
Montag, 7. März 2016, 15:45–16:00, H6
STM study of tower-shaped tripodal molecules on a Au(111) surface — •Timo Frauhammer1, Lukas Gerhard1, Kevin Edelmann1,3, Maximilian Kristen1, Marcin Lindner1, Michal Valasek1, Marcel Mayor1,2, and Wulf Wulfhekel1,3 — 1Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) — 2Department of Chemistry, University of Basel — 3Physikalisches Institut, Karlsruhe Institute of Technology
We examined three different tetraphenylmethane derivates deposited on a Au(111) surface using scanning tunneling microscopy (STM) at 5 K. The molecules are designed as tripodal tower-shaped molecules with a platform that specifically binds to the Au surface and molecular rods of one to three phenyl rings pointing away from the surface with a nitrile end group to allow contact formation to the STM tip. We deposited the molecules from a solution with Dichloromethane by using a spray technique.
It is shown that up to a height of at least three phenyl-rings the molecules indeed stand upright on their tripodal sulfur-feet with the head group arranged away from the surface. For the three investigated molecules, the apparent height, the shape in constant current images and the conductance at constant height are compared.