Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains

0434717 - FZÚ 2020 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Čermák, Jan - Yamada, T. - Ganzerová, Kristína - Rezek, Bohuslav
Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains.
NANOCON 2014 Conference Proceedings. Ostrava: Tanger Ltd, 2015 - (Shrbená, J.). 1st Edition. ISBN 978-80-87294-53-6.
[International Conference NANOCON /6./. Brno (CZ), 05.11.2014-07.11.2014]
Grant CEP: GA ČR(CZ) GBP108/12/G108
Institucionální podpora: RVO:68378271
Klíčová slova: graphene * chemical vapor deposition * atomic force microscopy * Raman spectroscopy * electronic properties
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on all the grains. Yet intensity of Raman 2D band is grain-dependent: highest at the darkest grain and lowest at the brightest one. Contrary, conductive atomic force microscopy detects the highest conductivity at the brightest grain and the lowest current at the darkest grain. This is attributed to dominant electrical current path through graphene and underlying oxide thickness of which also depends on the type of copper grain. We correlate and discuss the results with view to better understanding of graphene growth and electronic properties on large area copper substrates.
Trvalý link: http://hdl.handle.net/11104/0238688