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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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What Drives Metal-Surface Step Bunching in Graphene Chemical Vapor Deposition?

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Title
What Drives Metal-Surface Step Bunching in Graphene Chemical Vapor Deposition?
Author
Yi, DingLuo, DaWang, Zhu-JunDong, JichenZhang, XuWillinger, Marc-GeorgRuoff, Rodney S.Ding, Feng
Issue Date
201806
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.120, no.24, pp.246101 -
Abstract
Compressive strain relaxation of a chemical vapor deposition (CVD) grown graphene overlayer has been considered to be the main driving force behind metal surface step bunching (SB) in CVD graphene growth. Here, by combining theoretical studies with experimental observations, we prove that the SB can occur even in the absence of a compressive strain, is enabled by the rapid diffusion of metal adatoms beneath the graphene and is driven by the release of the bending energy of the graphene overlayer in the vicinity of steps. Based on this new understanding, we explain a number of experimental observations such as the temperature dependence of SB, and how SB depends on the thickness of the graphene film. This study also shows that SB is a general phenomenon that can occur in all substrates covered by films of two-dimensional (2D) materials.
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DOI
http://dx.doi.org/10.1103/PhysRevLett.120.246101
ISSN
0031-9007
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