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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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Adlayer-Free Large-Area Single Crystal Graphene Grown on a Cu(111) Foil

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Title
Adlayer-Free Large-Area Single Crystal Graphene Grown on a Cu(111) Foil
Author
Luo, DaWang, MeihuiLi, YunqingKim, ChangsikYu, Ka ManKim, YohanHan, HuijunBiswal, MandakiniHuang, MingKwon, YoungwooGoo, MinCamacho-Mojica, Dulce C.Shi, HaofeiYoo, Won JongAltman, Michael S.Shin, Hyung-JoonRuoff, Rodney S.
Issue Date
2019-08
Publisher
Wiley-VCH Verlag
Citation
ADVANCED MATERIALS, v.31, no.35, pp.1903615
Abstract
To date, thousands of publications have reported chemical vapor deposition growth of “single layer” graphene, but none of them has described truly single layer graphene over large area because a fraction of the area has adlayers. It is found that the amount of subsurface carbon (leading to additional nuclei) in Cu foils directly correlates with the extent of adlayer growth. Annealing in hydrogen gas atmosphere depletes the subsurface carbon in the Cu foil. Adlayer-free single crystal and polycrystalline single layer graphene films are grown on Cu(111) and polycrystalline Cu foils containing no subsurface carbon, respectively. This single crystal graphene contains parallel, centimeter-long ≈100 nm wide “folds,” separated by 20 to 50 µm, while folds (and wrinkles) are distributed quasi-randomly in the polycrystalline graphene film. High-performance field-effect transistors are readily fabricated in the large regions between adjacent parallel folds in the adlayer-free single crystal graphene film. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://scholarworks.unist.ac.kr/handle/201301/27338
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201903615
DOI
10.1002/adma.201903615
ISSN
0935-9648
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