| AVS 61st International Symposium & Exhibition | |
| 2D Materials Focus Topic | Monday Sessions |
| Session 2D+EM+NS+PS+SS+TF-MoM |
| Session: | 2D Materials Growth and Processing |
| Presenter: | Abbas Ebnonnasir, University of California at Los Angeles |
| Authors: | A. Ebnonnasir, University of California at Los Angeles H.S. Mok, University of California at Los Angeles Y. Murata, University of California at Los Angeles S. Nie, Sandia National Laboratories K.F. McCarty, Sandia National Laboratories C.V. Ciobanu, Colorado School of Mines S. Kodambaka, University of California at Los Angeles |
| Correspondent: | Click to Email |
In this research, using in situ low-energy electron microscopy and density functional theory calculations, we elucidate the growth kinetics of monolayer graphene on single-crystalline Pd(111). In our experiments, carbon saturated Pd(111) samples were cooled down from 900 oC to segregate carbon on the surface in the form of graphene. Upon cooling the substrate, graphene nucleation begins on bare Pd surface and continues to occur during graphene growth. Measurements of graphene growth rates and Pd surface work functions along with DFT calculations establish that this continued nucleation is due to increasing C adatom concentration on the Pd surface with time. We attribute this anomalous phenomenon to a large barrier for attachment of C adatoms to graphene coupled with a strong binding of the non-graphitic C to the Pd surface.