Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 65: Poster: Molecular Nanostructures on Surfaces

O 65.16: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Molecular materials for carbon capture and storage: On-surface characterisation of self-assembly and thermal-stability of metal phthalocyanines — •Joseph Straw, Matthew Edmondson, Liv Warwick, James N. O'Shea, and Alex Saywell — School of Physics & Astronomy, University of Nottingham, UK

The successful capture and storage of carbon- and nitrogen-containing greenhouse gases (e.g. CO2 and NOx - produced by industrial processes) is of significant environmental importance; materials enabling gas sequestration are a route to reducing the effects of climate change. Molecular based materials, containing units which can ligate and trap gas molecules, may provide a way of selectivity and efficiency removing pollutants. Porphyrins and phthalocyanines (Pcs), both of which can be functionalised with reactive metal atoms, have been extensively studied in ultra-high vacuum (UHV) conditions.[1] Importantly, the ligation of gaseous species to the metal centres of such molecules has been shown to be feasible. [2] Here we study the formation of molecular arrays of iron phthalocyanine (FePc) on Au(111) under systematically controlled thermal conditions. We employ UHV scanning tunnelling microscopy (UHV-STM) and X-ray photoelectron spectroscopy (XPS) to characterise the morphology and chemistry of the on-surface synthesised structures and investigate thermal stability of the Pc macrocycle and extended molecular islands.

[1] J. M. Gottfried, Surf. Sci. Rep. 70, 259 (2015) [2] E. Vesselli, J. Phys. Mater. 3, 022002 (2020)

Keywords: STM; XPS; On-surface synthesis; Phthalocyanine; FePc