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Author

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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Orientation-Dependent Strain Relaxation and Chemical Functionalization of Graphene on a Cu(111) Foil

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Title
Orientation-Dependent Strain Relaxation and Chemical Functionalization of Graphene on a Cu(111) Foil
Author
Li, Bao-WenLuo, DaZhu, LiyanZhang, XuJin, SunghwanHuang, MingDing, FengRuoff, Rodney S.
Keywords
chemical functionalization; Cu(111); wrinkle‐ free graphene
Issue Date
201803
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.30, no.10, pp.1706504 -
Abstract
Epitaxial graphene grown on single crystal Cu(111) foils by chemical vapor deposition is found to be free of wrinkles and under biaxial compressive strain. The compressive strain in the epitaxial regions (0.25-0.40%) is higher than regions where the graphene is not epitaxial with the underlying surface (0.20-0.25%). This orientation-dependent strain relaxation is through the loss of local adhesion and the generation of graphene wrinkles. Density functional theory calculations suggest a large frictional force between the epitaxial graphene and the Cu(111) substrate, and this is therefore an energy barrier to the formation of wrinkles in the graphene. Enhanced chemical reactivity is found in epitaxial graphene on Cu(111) foils as compared to graphene on polycrystalline Cu foils for certain chemical reactions. A higher compressive strain possibly favors lowering the formation energy and/or the energy gap between the initial and transition states, either of which can lead to an increase in chemical reactivity.
URI
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DOI
http://dx.doi.org/10.1002/adma.201706504
ISSN
0935-9648
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