Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: Focus Session Chemical Imaging for the Elucidation of Molecular Structure I (joint session O/BP)
O 91.7: Talk
Thursday, March 20, 2025, 17:15–17:30, H24
LFM study of copper oxide — •Sophia Schweiss, Alfred J. Weymouth, and Franz J. Giessibl — Universität Regensburg, Regensburg, Deutschland
Small-amplitude FM-AFM is a method to study surfaces and adsorbates with atomic resolution. At low temperature, the tip apex can be prepared so that it ends in a single O-atom, making the tip inert and enhancing imaging [1, 2]. With a laterally oscillating tip, i.e. lateral force microscopy (LFM), the conservative (frequency shift, Δ f) and non-conservative (dissipated energy, Ediss) components of the tip-sample interaction can also be independently measured. Here too, inert tip apices are commonly used. One measurement of Ediss relies on the cocking and snapping of the tip over a single chemical bond, for which the current state of the art utilizes CO-terminated tips. In this work, a CO-terminated tip [1] is used to investigate the (2 × 1)O reconstruction of Cu(110) with LFM. Simulations are performed to guide interpretation. In this larger ongoing study, these LFM measurements will be repeated for a CuOx tip [2] to evaluate it as a tool for measuring Ediss.
[1] Gross et al., Science, 325, 1110 (2009)
[2] Mönig et al., Nat. Nano., 13, 371 (2018)
Keywords: Atomic force microscopy; Tribology; Lateral force microscopy; Copper Oxide