10.1021/jp406415h.s001
R. Cortés
R.
Cortés
D. P. Acharya
D. P.
Acharya
C. V. Ciobanu
C. V.
Ciobanu
E. Sutter
E.
Sutter
P. Sutter
P.
Sutter
Graphene on Ru(0001) Moiré Corrugation Studied
by Scanning Tunneling Microscopy on Au/Graphene/Ru(0001) Heterostructures
American Chemical Society
2016
corrugation
Scanning Tunneling Microscopy
graphene
theory calculations
STM
elasticity theory equations
gold film
scanning tunneling microscopy
monolayer
2016-02-18 16:32:03
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Graphene_on_Ru_0001_Moire_Corrugation_Studied_by_Scanning_Tunneling_Microscopy_on_Au_Graphene_Ru_0001_Heterostructures/2367400
Two-dimensional
Au islands of different thicknesses grown on graphene/Ru(0001)
were used to study the corrugation of the moiré structure of
graphene/Ru(0001) and discriminate between its mainly structural or
electronic character. A comparison of the apparent corrugation measured
by scanning tunneling microscopy (STM) for different Au thicknesses
with results of elasticity theory equations applied to a gold film
over a corrugated substrate shows that the corrugation observed for
the graphene/Ru(0001) moiré is of structural nature rather
than electronic. STM showed a large value for the corrugation of the
first Au monolayer on graphene/Ru(0001), 1.7 Å; using density
functional theory calculations, we explain this large corrugation
of the Au monolayer as the result of a strong (weak) binding of the
Au layer at the valley (hill) regions of the graphene/Ru(0001) moiré
structure and infer an actual corrugation of the graphene/Ru(0001)
moiré structure of ∼1.2 Å from the measured corrugation
of the Au monolayer.