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Title: Kinetics of monolayer graphene growth by segregation on Pd(111)

Using in situ low-energy electron microscopy and density functional theory calculations, we follow the growth of monolayer graphene on Pd(111) via surface segregation of bulk-dissolved carbon. Upon lowering the substrate temperature, nucleation of graphene begins on graphene-free Pd surface and continues to occur during graphene growth. Measurements of graphene growth rates and Pd surface work functions 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.
Authors:
; ;  [1] ; ;  [2] ; ;  [3]
  1. Department of Materials Science and Engineering, University of California Los Angeles, Los Angeles, California 90095 (United States)
  2. Department of Mechanical Engineering and Materials Science Program, Colorado School of Mines, Golden, Colorado 80401 (United States)
  3. Sandia National Laboratories, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22257744
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTAL GROWTH; DENSITY FUNCTIONAL METHOD; ELECTRON MICROSCOPY; GRAPHENE; GRAPHITE; PALLADIUM 111; SEGREGATION; SURFACES; WORK FUNCTIONS