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Kwon, Soon-Yong
Frontier, Innovative Nanomaterials & Devices (FIND) Lab
Research Interests
  • Semiconductor Epitaxy, thin film technology & surface/ interface Science

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Unraveling the Water Impermeability Discrepancy in CVD-Grown Graphene

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Title
Unraveling the Water Impermeability Discrepancy in CVD-Grown Graphene
Author
Kwak, JinsungKim, Se-YangJo, YongsuKim, Na YeonKim, Sung YoubLee, ZonghoonKwon, Soon-Yong
Issue Date
2018-07
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.30, no.30, pp.1800022
Abstract
Graphene has recently attracted particular interest as a flexible barrier film preventing permeation of gases and moistures. However, it has been proved to be exceptionally challenging to develop large-scale graphene films with little oxygen and moisture permeation suitable for industrial uses, mainly due to the presence of nanometer-sized defects of obscure origins. Here, the origins of water permeable routes on graphene-coated Cu foils are investigated by observing the micrometer-sized rusts in the underlying Cu substrates, and a site-selective passivation method of the nanometer-sized routes is devised. It is revealed that nanometer-sized holes or cracks are primarily concentrated on graphene wrinkles rather than on other structural imperfections, resulting in severe degradation of its water impermeability. They are found to be predominantly induced by the delamination of graphene bound to Cu as a release of thermal stress during the cooling stage after graphene growth, especially at the intersection of the Cu step edges and wrinkles owing to their higher adhesion energy. Furthermore, the investigated routes are site-selectively passivated by an electron-beam-induced amorphous carbon layer, thus a substantial improvement in water impermeability is achieved. This approach is likely to be extended for offering novel barrier properties in flexible films based on graphene and on other atomic crystals.
URI
https://scholarworks.unist.ac.kr/handle/201301/24139
URL
https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.201800022
DOI
10.1002/adma.201800022
ISSN
0935-9648
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