Single Molecule Tribology: Force Microscopy Manipulation of a Porphyrin Derivative on a Copper Surface

Pawlak, Rémy and Ouyang, Wengen and Filippov, Alexander E. and Kalikhman-Razvozov, Lena and Kawai, Shigeki and Glatzel, Thilo and Gnecco, Enrico and Baratoff, Alexis and Zheng, Quan-Shui and Hod, Oded and Urbakh, Michael and Meyer, Ernst. (2015) Single Molecule Tribology: Force Microscopy Manipulation of a Porphyrin Derivative on a Copper Surface. ACS Nano, 10 (1). pp. 713-722.

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The low-temperature mechanical response of a single porphyrin molecule attached to the apex of an atomic force microscope (AFM) tip during vertical and lateral manipulations is studied. We find that approach-retraction cycles as well as surface scanning with the terminated tip result in atomic-scale friction patterns induced by the internal reorientations of the molecule. With a joint experimental and computational effort, we identify the dicyanophenyl side groups of the molecule interacting with the surface as the dominant factor determining the observed frictional behavior. To this end, we developed a generalized Prandtl-Tomlinson model parametrized using density functional theory calculations that includes the internal degrees of freedom of the side group with respect to the core and its interactions with the underlying surface. We demonstrate that the friction pattern results from the variations of the bond length and bond angles between the dicyanophenyl side group and the porphyrin backbone as well as those of the CN group facing the surface during the lateral and vertical motion of the AFM tip.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Glatzel, Thilo and Pawlak, Rémy and Kawai, Shigeki and Gnecco, Enrico and Baratoff, Alexis and Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:02
Deposited On:18 May 2016 11:26

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