Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 5: Nanostructures at Surfaces I: Organics
O 5.3: Vortrag
Montag, 1. April 2019, 11:00–11:15, H15
Molecularly resolved STM imaging of electron-induced cross-linking of aromatic self-assembled monolayers — •Patrick Stohmann1, Sascha Koch1, Yang Yang1, Christopher David Kaiser1, Niklas Biere2, and Armin Gölzhäuser1 — 1Faculty of Physics, Physics of Supramolecular Systems and Surfaces, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany — 2Faculty of Physics, Experimental Biophysics and Applied Nanoscience, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld, Germany
When aromatic self-assembled monolayers (SAMs) are irradiated by electrons, intermolecular cross-linking leads to the formation of carbon nanomembranes (CNMs) with molecular thickness [1], making them ideal membranes for water purification [2]. Here, we focus on the structural transformation of a pristine 4-terphenylthiol (TPT) SAM on a Au(111) surface, investigated by scanning tunneling microscopy (STM). The irradiation with electrons was carried out by employing a focused electron beam of a scanning electron microscope (SEM) at 1keV, and, for comparison, a low-energy flood gun at 50eV. The use of a combined STM/SEM microscope enables to acquire STM images before and after the irradiation steps without losing the probed sample area. We demonstrate that it is possible to study and image the initial steps of electron-induced cross-linking of the molecular layers. [1] A. Turchanin and A. Gölzhäuser, Adv. Mat. 2016, 28, 6075-6103 [2] Y. Yang et al., ACS Nano 2018, 12 (5), 4695-4701