SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 102: Poster Session VIII: Organic molecules on inorganic substrates: electronic, optical and other properties IV
O 102.1: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Measuring the Change in Reactivity of a Single Molecule — •Jack Henry, Phil Blowey, and Adam Sweetman — University Of Leeds, Leeds, United Kingdom
Decades of surface science studies on adsorbed molecules have shown the surface a molecule is adsorbed on can effect the molecules electronic and geometric structure [1-3]. In this work, the influence of molecule-substrate bonding on the interactions experienced by a scanning probe microscope (SPM) tip were investigated.
A system comprised of C60 molecules adsorbed on the Cu(111) surface was studied using simultaneous non-contact atomic force microscopy (NC-AFM) and scanning tunnelling microscopy (STM). This system is ideal for invesitgating the effect molecule-substrate bonding has on the physico-chemical properties of a molecule as the C60- Cu(111) interface can be controlled to form two distinct structures [4-6]. The physico-chemical properties of the C60 molecules were investigated using NC-AFM spectroscopy. A comparison was made by looking at the force minima in collected spectra, along with the corresponding junction conductance. Complementary ab initio simulations of the spectra were performed in density functional theory (DFT) to gain a deeper understanding of the experimental results.
[1] L. Gross et al. Science 325, 110 (2009); [2] J. Repp et al. PRL 94, 026803 (2005); [3] F Mohn et al. University Of Regensburg (2012); [4] W. Wu Pa et al. PRL 104, 036103 (2010); [5] J. A. Larsson et al. PRB 77, 115434 (2008); [6] J. Brand et al. Nano.Lett. 19, 7845-7851 (2019);