Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Poster Wednesday: 2D Materials

O 66.12: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B2

The surface of high-temperature non-IPR fullerides — Jürgen Weippert¹, Seyithan Ulas¹, Eugen Wald¹, Bastian Kern¹, Dmitry Strelnikov¹, Mateo Amatti², Luca Gregoratti², Maya Kiskinova², and •Artur Böttcher² — ¹Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany — ²Elettra, Sincrotrone Trieste, ScPA Area Science Park, 34149 Basovizza-Trieste, Italy

Alkali metal doped non-IPR fullerene materials C_n, (n = 60−2k and n = 70−2k, k=1,..5) represent a new class of fullerides.[1] We created Cs_xC₅₈ and Cs_xC₆₈ materials making use of the low energy cluster beam deposition (LECBD [2]). The non-IPR fullerene cages C₅₈ and C₆₈ form a covalently stabilized scaffold which gets doped by Cs atoms already during the growth. By heating the resulting material up to 1100K monodispersed high-temperature carbon solids, HT-Cs_xC_n, can be created. The resulting materials exhibit high stability and considerably depleted Cs contents. The carbon scaffolds are stabilized by multifold covalent intercage bonds.[3] The surface morphology is driven by on-top segregation in the two-component system. In both HT materials the surface topography is dominated by islands standing out by their elevated Cs/C_n ratio r.[1] Whereas the islands seen in Cs_xC₅₈ exhibit r values not larger than 2 the bright surface areas in the Cs_xC₆₈ solids surprise with extremely high r values (up to 70 Cs atoms per cage). [1] S. Ulas, et al. Phys. Status Solidi B 2018, 1800453 (1-13).[2] S. Ulas, et al. Carbon 2014, 68, 125-137.[3] S. Ulas, et al. J. Chem. Phys. 2012, 136, 114708.