Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 49: Poster: Nanostructures on Surfaces I

O 49.7: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Adsorption and Assembly of Photoelectronic TiOPc Molecules on Coinage Metal Surfaces — •Wenhui Zhao, Hao Zhu, and Kai Wu — College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

The adsorption and assembly of individual and sub-monolayered TiOPc on Ag(111), Cu(111) and Au(111) has been investigated by STM and STS. High-resolution STM imaging and dI/dV and I - z measurements reveal that TiOPc adsorbed on Ag(111) possesses two configurations, i.e., O-up and O-down configurations. Dipole-dipole interactions drive the TiOPc molecules to form a highly ordered checkerboard assembly structure on Ag(111) with alternating rows of the O-up and O-down adsorption conformations. The restricted surface mobility and diffusivity due to the strong interaction between the Cu(111) substrate and the TiOPc molecules and the templating effect of the reconstructed Au(111) herringbone structure result in no assemblies of the TiOPc molecules on these surfaces. Instead, the experimentally observed molecular dimers on both Au(111) and Cu(111) as well as the molecular aggregates on Au(111) indicate that the intermolecular dipole-dipole attraction and weak hydrogen bonding play an important role in dictating the adsorption and steering the assembly of the TiOPc molecules on the coinage metal surfaces.