Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 64: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures IV

O 64.9: Vortrag

Mittwoch, 14. März 2018, 17:15–17:30, MA 004

Mechanical response while pulling a single poly-pyrene chain on gold — •Rémy Pawlak¹, Philipp D'Astolfo¹, Guilherme Vilenha², Tobias Meier¹, Thilo Glatzel¹, Shi-Xia Liu³, Silvio Decurtin³, Ruben Perez², and Ernst Meyer¹ — ¹Physics Department,University of Basel, Switzerland — ²Departamento de Fisica Teorica de la Materia Condensada, Universidad Autonoma de Madrid, Spain — ³Department of Chemistry and Biochemistry, University of Berne, Switzerland

The intamolecular mechanics of a molecule govern its diffusion while sliding over a surface. Quantifying such aspect at the molecule level is however challenging and poorly observed so far [1-3]. Here, we synthesized long polypyrene chains linked by C-C bonds on Au(111) and proceed to their vertical and lateral manipulations with the apex of an atomic force microscope. Combined force measurements and numerical calculations show that periodic modulations in the force response arise from the detachment of single pyrene units from the surface as well as their sliding over the surface lattice potential. These periodicities show that the remaining pyrene on the surface "snake" during manipulations to adapt its commensurability with the surface lattice as well as reduce the mechanical stress induced by the lifted units. [1] Kawai et al. Proc. Natl. Acad. Sci. USA 2014, 111, 3968-3972. [2] Kawai et al. Science 2016, 351, 957-961. [3] Pawlak et al. ACS Nano 2016 10, 713-722