Dresden 2017 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 82: Nanostructures at Surfaces: Graphene and Other Aspects
O 82.1: Talk
Wednesday, March 22, 2017, 16:00–16:15, REC/PHY C213
Sublimation of non-IPR fullerene dimers — •Jürgen Weippert1, Lea Hohmann1, Artur Böttcher1, and Manfred M. Kappes1,2 — 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.