On-Surface Synthesis of Graphene Nanoribbons on Two-Dimensional Rare Earth–Gold Intermetallic Compounds
2020
Here,
we demonstrate two reliable routes for the fabrication of
armchair-edge graphene nanoribbons (GNRs) on TbAu2/Au(111),
belonging to a class of two-dimensional ferromagnetic rare earth–gold
intermetallic compounds. On-surface synthesis directly on TbAu2 leads to the formation of GNRs, which are short and interconnected
with each other. In contrast, the intercalation approachon-surface
synthesis of GNRs directly on Au(111) followed by rare earth intercalationyields
GNRs on TbAu2/Au(111), where both the ribbons and TbAu2 are of high quality comparable with those directly grown
on clean Au(111). Besides, the as-grown ribbons retain the same band
gap while changing from p-doping to weak n-doping mainly due to a
change in the work function of the substrate after the rare earth
intercalation. The intercalation approach might also be employed to
fabricate other types of GNRs on various rare earth intermetallic
compounds, providing platforms to tailor the electronic and magnetic
properties of GNRs on magnetic substrates.
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