Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Nanostructures at Surfaces: Graphene and Other Aspects

O 82.1: Vortrag

Mittwoch, 22. März 2017, 16:00–16:15, REC/PHY C213

Sublimation of non-IPR fullerene dimers — •Jürgen Weippert¹, Lea Hohmann¹, Artur Böttcher¹, and Manfred M. Kappes^1,2 — ¹Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany — ²Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Non-IPR fullerenes were generated in vacuum by electron impact ionization and fragmentation of IPR fullerenes (C60, C70). The corresponding solids were formed by low energy ion beam deposition of the mass-selected Cn cages onto HOPG. The materials grow via formation of a network of covalently interlinked oligomers. This morphology is responsible for the unique properties of these novel materials such as an (n-dependent) band gap, high thermal stability, hardness and Young*s modulus.... Recently we found, that the sublimation of some non-IPR solids proceeds via a second channel: in addition to the dominant emission of monomers we also observe the emission of dimers. These show a significantly higher sublimation enthalpy than found for related monomers. Furthermore, we can relate the monomer geometries to the emission intensity in competition with thermal hardening of the network.