Sensitivity of graphene edge states to surface adatom interactions.
Electron beam irradiation at 60 kV is used to open holes in graphene and expose fresh clean edges for further examination by electron energy loss spectroscopy (EELS) at the single atom level combined with scanning transmission electron microscopy (STEM). We show that light element surface adatoms attached on top of the edges of graphene influence the carbon K-edge EELS. A single nitrogen adatom on graphene was imaged by STEM and chemically identified by EELS. We also extend this study to smal...Expand abstract
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