  Graphene adsorption on Au(111) surface was explored to identify their common
surface structures by means of van der Waals corrected density functional
theory calculations. The alignment of graphene in the form of certain
rotational angles on the gold surface has an important role on the lattice
matching which causes Moir\'{e} patterns, and on the electronic properties of
the resulting common cell structures. The dispersive weak interactions between
carbon and gold layers lead to a downward shift of Fermi energy of the
adsorption system with respect to the Dirac point of graphene showing a
$p$-type doping character. Moreover, the shift was shown to depend on the
rotational angle of graphene on Au(111).
