High-temperature-deposited rotated graphene (Gr) on Ni(111) has been
investigated by in situ scanning tunneling microscopy and spectroscopy at room
temperature. The rotated Gr exhibits weak bonding to the Ni(111) surface,
which facilitates formation of Ni2C or a second Gr layer underneath via bulk
carbon segregation. Areas of rotated Gr present a bias voltage dependence of
the apparent amplitude of Gr superlattice corrugations. We find that Ni2C
underneath rotated Gr introduces additional electronic features that vary with
the gap resistance, which could be related to an orientation-dependent
interaction between Ni2C and Gr. Furthermore, the exposure to oxygen has a
significant influence on the local density of states of Gr/Ni2C, other than on
Ni(111) covered with nonrotated Gr
