Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Poster: Scanning Probe Techniques: Method Development

O 68.12: Poster

Mittwoch, 20. März 2024, 18:00–20:00, Poster C

Automated STM imaging and spectroscopy: porphyrin molecular arrays as an exemplar — •Matthew Edmondson and Alex Saywell — School of Physics & Astronomy, University of Nottingham, UK

Materials analysis via scanning probe microscopy (SPM) is often labour intensive and not standardised to the level of the procedures employed within characterisation techniques such as nuclear magnetic resonance (NMR) and mass spectrometry. While SPM approaches provide impressive atomic/sub-molecular spatial resolution, [1] and allow characterisation of electronic states, a key challenge is to obtain statistically sufficient measurements over the panoply of features present on the material under study. Molecular overlayers, specifically the often-studied porphyrin-based assemblies on metals [2], provide a test-platform for the automated spatial and electronic characterisation of a molecule-substrate system. Porphyrin molecules may undergo various on-surface process (e.g. ring-closing, metalorganic coordination, and self-metalation) with a resultant change in electronic states potentially offering a `fingerprint' of the chemical and structural changes.

Here, we present details of a semi-automated approach to characterising a molecule-substrate system. Custom SPM imaging and spectroscopy routines have been developed to interface with commercial control electronics and provide a route towards automated data collection.

[1] A. Sweetman, N.R. Champness, A. Saywell, Chem. Soc. Rev., 2020, 49, 4189 [2] Gottfried, J. M., Surf. Sci. Rep., 2015, 70, 259

Keywords: SPM; Automation; On-surface synthesis