Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 74: Nanostructured Surfaces and Thin Films I: Synthesis and Properties (joint session O/CPP)

O 74.9: Talk

Wednesday, March 18, 2020, 17:00–17:15, WIL B321

Atomic-scale mechanical evidence of surface-catalyzed gold-carbon covalent bonding — •Benjamin Lowe, Jack Hellerstedt, Dhaneesh Kumar, and Agustin Schiffrin — School of Physics and Astronomy, Monash University, Clayton VIC 3800 Australia

Surface-confined self-assembly is a versatile method for creating and tuning the properties of low-dimensional nanostructures. Here we study the results of gold atoms and dicyanoanthracene (DCA) molecules deposited on Ag(111) in ultrahigh vacuum, characterized at 5K using combined scanning tunneling and non-contact atomic force microscopies (STM/nc-AFM). We found that the two-dimensional metal-organic self-assembly was composed of close-packed DCA-Au-DCA units, in which a single Au atom binds covalently to a carbon atom at the anthracene ends. This conclusion is based on submolecular resolution ncAFM imaging achieved with a CO-functionalized probe, as well as STM manipulation demonstrating the robustness of these DCA-Au-DCA units. Further experiments performed on an atomically thin insulator (hexagonal boron nitride) suggest the covalent DCA-Au-DCA bonding is catalyzed by the Ag surface. We expect these findings to inform the pursuit of metal-organic frameworks predicted to host topological electronic properties [1].

[1] Zhang, L. Z. et. al. Nano Letters (2016). 10.1021/acs.nanolett.6b00110.