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 37.14: Poster
Donnerstag, 29. März 2012, 15:00–17:00, Poster E
Thermal transformations in CsxC58 fullerides — •Seyithan Ulas1, Daniel Löffler2, Patrick Weis1, Artur Böttcher1, and Manfred Kappes1 — 1KIT, Institut für Physikalische Chemie, Karlsruhe, Germany — 2BASF, Intermediates Research, Ludwigshafen, Germany
Monodisperse cluster films consisting of C58 fullerene cages have been fabricated by soft-landing of mass-selected C58 cations created by electron-impact induced fragmentation/ionization of C60 cages [1]. The doping of the C58 films by alkali metals leads to the formation of fullerides, CsxC58 [2]. The temperature resolved mass spectra taken during the sublimation of CsxC58 phase reveal three well distinguishable components, C56, C58 and C60. The new components, C56 and C58, indicate the transfer of a C2 unit from a C58 cage to an adjacent one, -[C58]-[C58]→C56+C60 to be a process which competes with the breakage of the intercage bonds constituted by non-IPR sites (e.g. 2AP-2AP). The Cs doping raises the C58 → C60 conversion ratio from 0.04 for pristine C58 films up to 3.9 for a saturated CsxC58 phase. Consequently, sublimation of the saturated CsxC58 fullerides proceeds predominantly via C60 emission. The CsxC58 films survive the annealing procedure (up to 1100K) as a new conducting carbon phase constituted by chains of fused cages which exhibit interesting vibronic and mechanic properties.
[1] A. Böttcher, et al., PCCP 7, 2816 (2005).
[2] D. Löffler, et al. Phys. Rev. B 77,155405 (2008).