Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 37: Poster II: Focused electron beam induced processing for the fabrication of nanostructures (focused session, jointly with O); Nanoengineered thin films; Layer properties: electrical, optical, and mechanical properties; Thin film characterization: structure analysis and composition (XRD, TEM, XPS, SIMS, RBS,..); Application of thin films
DS 37.37: Poster
Donnerstag, 29. März 2012, 15:00–17:00, Poster E
Novel high-temperature films consisting of mass selected carbon clusters — •Artur Böttcher, Seyithan Ulas, Patrick Weis, and Manfred Kappes — KIT, Institut für Physikalische Chemie, Karlsruhe
Cluster beam deposition has been established as a method for preparation of monodisperse films consisting of tailored building blocks. We fabricated thick films via aggregation of small fullerene cages, Cn (48 < n < 70). Such carbon cages are created by electron-impact inducend ionization/fragmentation of IPR cages: C70+ e→ C68+C2→ C66+C2→… Film growth is governed by the formation of -Cn-Cn- oligomers interlinked by covalent bonds constituted by nIPR-nIPR bridges. All Cn films created are semiconducting with electronic and vibronic properties depending on the size of the Cn building blocks (IP, HOMO-LUMO-gap, valence band, etc.). The thermal stability of the Cn films can be related to the mean number of non-IPR sites in Cn cage. Some Raman bands confirm the role of the covalently stabilized oligomers as the species responsible for unique mechanical and thermal properties. The Cn solids exhibit mechanical properties comparable to graphite. Annealing the Cn solids up to 1100 K results in stable chains of fused Cn cages (HT-Cn solids).