Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 93: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses I
O 93.3: Vortrag
Donnerstag, 15. März 2018, 11:30–11:45, HE 101
Ultrafast nanotectonics with nanocrystalline graphene — Silvio Morgenstern, •Arne Senftleben, Marlene Adrian, Christian Gerbig, and Thomas Baumert — Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel
Nanocrystalline graphene consists of nanometer-sized plates with a perfect graphene structure, which are coupled to each other via lattice defects containing sp3 hybridized carbon atoms. When heated, the plates expand and the sp3 hybrids act as a hinge. The result is a nano-scale movement that recalls the formation of wrinkled mountains. Here we report on expansion time scales in the 100 fs regime followed by out of plane dynamics on the sub ps time scale on a free standing nanocrystalline graphene sheets with the help of our high resolution ultrafast electron diffraction apparatus.