Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 39: Symposium Molecular Switches and Motors at Surfaces (O jointly with BP, CPP)

O 39.1: Hauptvortrag

Mittwoch, 2. April 2014, 09:30–10:00, HSZ 02

Imaging and manipulation of single functional molecules on surfaces — •Leonhard Grill — University of Graz, Department of Physical Chemistry, Graz, Austria

Functional molecules on surfaces and their assembly into pre-defined architectures are key challenges in nanotechnology and of interest in various fields from molecular electronics over novel materials to molecular machines. Various examples of functional molecules, studied by scanning tunneling microscopy under ultrahigh vacuum conditions will be discussed. Specifically designed molecular building blocks are connected to two-dimensional networks or one-dimensional chains [1,2], which can act as molecular wires [3,4]. On the other hand, chemical processes within individual molecular can be controlled via their environment. This was observed for molecular switches, where the atomic-scale surroundings cause drastic changes in their switching probability [5]. Recently, we could show that the rate of an intramolecular hydrogen transfer reaction can be tuned up and down by single atoms in the vicinity of the molecule [6]. Finally, a combination of the two approaches will be discussed, potentially leading to heterogeneous molecular nanostructures that contain functional molecules.

[1] L. Grill et al., Nature Nanotech. 2, 687 (2007); [2] L. Lafferentz et al., Nature Chem. 4, 215 (2012); [3] L. Lafferentz et al., Science 323, 1193 (2009); [4] M. Koch et al., Nature Nanotech. 7, 712 (2012); [5] C. Dri et al., Nature Nanotech. 3, 649 (2008); [6] T. Kumagai et al., Nature Chem., doi: 10.1038/nchem.1804.