Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 74: Graphene: Electronic Properties, Structure and Substrate Interaction II (joint session DY, DS, HL, MA, O, TT, organized by O)
TT 74.1: Talk
Thursday, March 23, 2017, 15:00–15:15, TRE Ma
Microscopic investigations of graphene grown on copper foil — •Philip Schädlich1, Florian Speck1, Julia Krone1, Patrick Herlinger2, Pranoti Kshirsagar2, Martina Wanke1, Jurgen Smet2, and Thomas Seyller1 — 1Professur für Technische Physik, TU Chemnitz, Reichenhainer Straße 70, D-09126 Chemnitz, Germany — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
Graphene grown by CVD on polycrystalline copper foil is investigated by PEEM, LEEM, LEED and STM. LEED indicates that the flakes consist of rotated domains as well as twisted bilayer areas. The twist between two graphene layers grown on top of each other leads to the formation of periodic Moiré superstructures, which were observed by STM. In addition, the formation of surface facets on the copper foil gives rise to a stripe pattern in PEEM and LEEM, and a displaced LEED pattern, which can be attributed to the inclined terraces of the faceted surface by dark field LEEM. Inclination angles between facets have been determined by energy dependent LEED and are comparable with literature reports [1, 2]. AFM and STM confirm the results of the faceted surface obtained by LEEM.
[1] S. Nie, et al., New J. Phys. 14, 093028 (2012).
[2] J. Kraus, et al., Carbon 64, 377 (2013).