Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Surface Chemical Reactions and Heterogeneous Catalysis I
O 8.8: Vortrag
Montag, 11. März 2013, 12:15–12:30, H33
Surface activated dedeuteration of deuterofullerenes — Seyithan Ulas, Patrick Weis, •Artur Böttcher, and Manfred Kappes — Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany
Deuterofullerenes have been created by exposing C60 films grown on Au(111) to atomic deuterium. The composition of the films created is dominated by C60D18 and C60D36. The thermally induced decomposition of the deuterofullerenes proceeds via emission of D2, C60 and C60Dx<46. The C60Dx/Au(111) interface has been found to be responsible for the D2 emission observed. The catalytic role of the Au(111) surface resembles the activated dedeuteration of deuterofullerenes as induced by alkali metal doping /1/. A lower limit to the D2/D conversion yield (integrated D2 emission/D exposure) as induced by C60 on Au(111) has been estimated to be higher than 10−4. D2 emission competes with cage fragmentation which leads to gradual graphitization of the Au(111) surface. The latter process corresponds to poisoning of the catalyst.
/1/ D. Löffler et al. J. Phys. Chem. C, 112 (2008) 13796