Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks

O 73.4: Talk

Wednesday, March 18, 2020, 16:00–16:15, TRE Phy

STM Investigation on Structural Transformation of Terphenylthiol Self-Assembled Monolayers Induced by Electron Irradiation — •Patrick Stohmann, Sascha Koch, Yang Yang, Christopher David Kaiser, Xianghui Zhang, and Armin Gölzhäuser — Physics of Supramolecular Systems and Surfaces, Bielefeld University, 33615 Bielefeld, Germany

Carbon Nanomembranes (CNMs) are two-dimensional sheets with tailored physical and chemical properties. They are prepared via electron irradiation induced cross-linking of aromatic self-assembled monolayers (SAMs). However, the molecular structure of CNMs and the underlying mechanisms of the cross-linking process are not fully understood. Here, the structural transformation of a pristine p-terphenylthiol (TPT) SAM on Au(111) was studied with a scanning tunneling microscope (STM) combined with a scanning electron microscope (SEM). STM images of the initial steps of irradiation exhibit depressive spots in the SAM, which is analogous to nucleation sites and could be correlated with radical chain reactions connecting up to 40 molecules. The chain reactions could be initiated by 6 eV (secondary) electron attachment and potentially terminated by steric hindrance. The electron irradiation was carried out by employing a low-energy flood gun emitting 50 eV electrons for a comparative study.