First principles study of the graphene/Ru(0001) interface

Jiang, Deen; Du, Mao-Hua; Dai, Sheng

doi:10.1063/1.3077295

First principles study of the graphene/Ru(0001) interface

Journal Article · Sat Jan 31 23:00:00 EST 2009 · The Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3077295· OSTI ID:962993

Jiang, Deen ^[1]; ^[1]; ^[1]

ORNL

Annealing the Ru metal that typically contains residual carbon impurities offers a facile way to grow graphene on Ru(0001) at the macroscopic scale. Two superstructures of the graphene/Ru(0001) interface with periodicities of 3.0 and 2.7 nm, respectively, were previously observed by scanning tunneling microscopy. Using first principles density functional theory, we optimized the observed superstructures and found interfacial C-Ru bonding of C atoms atop Ru atoms for both superstructures, which causes the graphene sheet to buckle and form periodic humps of {approx}1.7 {angstrom} in height within the graphene sheet. The flat region of the graphene sheet, which is 2.2-2.3 {angstrom} above the top Ru layer and has more C atoms occupying the atop sites, interacts more strongly with the substrate than does the hump region. We found that interfacial adhesion is much stronger for the 3.0 nm superstructure than for the 2.7 nm superstructure, suggesting that the former is the thermodynamically more stable phase. We explained the 3.0 nm superstructure's stability in terms of the interplay between C-Ru bonding and lattice matching.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 962993

Journal Information:: The Journal of Chemical Physics, Journal Name: The Journal of Chemical Physics Journal Issue: 7 Vol. 130; ISSN JCPSA6; ISSN 0021-9606

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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First principles study of the graphene/Ru(0001) interface

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