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Strain Relaxation of Graphene Layers by Cu Surface Roughening

Cited 36 time in Web of Science Cited 34 time in Scopus
Authors
Kang, Jin Hyoun; Moon, Joonhee; Kim, Dong Jin; Kim, Yooseok; Jo, Insu; Jeon, Cheolho; Lee, Jouhahn; Hong, Byung Hee
Issue Date
2016-10
Citation
Nano Letters, Vol.16 No.10, pp.5993-5998
Keywords
grapheneCu step bunchingRaman spectroscopyAFMstrain relaxation
Abstract
The surface morphology of copper (Cu) often changes after the synthesis of graphene by chemical vapor deposition (CVD) on a Cu foil, which affects the electrical properties of graphene, as the Cu step bunches induce the periodic ripples on graphene that significantly disturb electrical conduction. However, the origin of the Cu surface reconstruction has not been completely understood yet. Here, we show that the compressive strain on graphene induced by the mismatch of thermal expansion coefficient with Cu surface can be released by forming periodic Cu step bunching that depends on graphene layers. Atomic force microscopy (AFM) images and the Raman analysis show the noticeably longer and higher step bunching of Cu surface under multilayer graphene and the weaker biaxial compressive strain on multilayer graphene compared to monolayer. We found that the surface areas of Cu step bunches under multilayer and monolayer graphene are increased by similar to 1.41% and similar to 0.77% compared to a flat surface, respectively, indicating that the compressive strain on multilayer graphene can be more effectively released by forming the Cu step bunching with larger area and longer periodicity. We believe that our finding on the strain relaxation of graphene layers by Cu step bunching formation would provide a crucial idea to enhance the electrical performance of graphene electrodes by controlling the ripple density of graphene.
ISSN
1530-6984
URI
https://hdl.handle.net/10371/172216
DOI
https://doi.org/10.1021/acs.nanolett.6b01578
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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