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Title: Nucleation of graphene layers on magnetic oxides: Co 3O 4(111) and Cr 2O 3(0001) from theory and experiment

We report directly grown strongly adherent graphene on Co 3O 4(111) by carbon molecular beam epitaxy (C MBE) at 850 K and density functional theory (DFT) findings that the first graphene layer is reconstructed to fit the Co 3O 4 surface, while subsequent layers retain normal graphene structure. This adherence to the Co 3O 4 structure results from partial bonding of half the carbons to top oxygens of the substrate. This structure is validated by X-ray photoelectron spectroscopy and low-energy electron diffraction studies, showing layer-by-layer graphene growth with ~0.08 electrons/carbon atom transferred to the oxide from the first graphene layer, in agreement with DFT. In contrast, for Cr 2O 3 DFT finds no strong bonding to the surface and C MBE on Cr 2O 3(0001) yields only graphite formation at 700 K, with C desorption above 800 K. As a result, strong graphene-to-oxide charge transfer aids nucleation of graphene on incommensurate oxide substrates and may have implications for spintronics.
Authors:
 [1] ; ORCiD logo [2] ;  [1] ;  [1] ; ORCiD logo [2] ;  [1]
  1. Univ. of North Texas, Denton, TX (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Grant/Contract Number:
SC0014607; ECCS-1508991; DMR-1436985
Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Research Org:
California Institute of Technology, Pasadena, CA (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1347748