How Low Nucleation Density of Graphene on CuNi Alloy is Achieved

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dc.contributor.authorLiu, Yifan
dc.contributor.authorWu, Tianru
dc.contributor.authorYin, Yuling
dc.contributor.authorZhang, Xuefu
dc.contributor.authorYu, Qingkai
dc.contributor.authorSearles, Debra J.
dc.contributor.authorDing, Feng
dc.contributor.authorYuan, Qinghong
dc.contributor.authorXie, Xiaoming
dc.date.accessioned2019-10-18T17:53:43Z
dc.date.available2019-10-18T17:53:43Z
dc.date.issued2018-03
dc.description.abstractCuNi alloy foils are demonstrated to be one of the best substrates for synthesizing large area single-crystalline graphene because a very fast growth rate and low nucleation density can be simultaneously achieved. The fast growth rate is understood to be due the abundance of carbon precursor supply, as a result of the high catalytic activity of Ni atoms. However, a theoretical understanding of the low nucleation density remains controversial because it is known that a high carbon precursor concentration on the surface normally leads to a high nucleation density. Here, the graphene nucleation on the CuNi alloy surfaces is systematically explored and it is revealed that: i) carbon atom dissolution into the CuNi alloy passivates the alloy surface, thereby drastically increasing the graphene nucleation barrier; ii) carbon atom diffusion on the CuNi alloy surface is greatly suppressed by the inhomogeneous atomic structure of the surface; and iii) a prominent increase in the rate of carbon diffusion into the bulk occurs when the Ni composition is higher than the percolation threshold. This study reveals the key mechanism for graphene nucleation on CuNi alloy surfaces and provides a guideline for the catalyst design for the synthesis of graphene and other 2D materials.
dc.description.departmentEngineering
dc.formatText
dc.format.extent8 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationLiu, Y., Wu, T., Yin, Y., Zhang, X., Yu, Q., Searles, D. J., Ding, F., Yuan, Q., & Xie, X. (2018). How low nucleation density of graphene on CuNi alloy is achieved. Advanced Science, 5(6).
dc.identifier.doihttps://doi.org/10.1002/advs.201700961
dc.identifier.issn2198-3844
dc.identifier.urihttps://hdl.handle.net/10877/8717
dc.language.isoen
dc.publisherWiley
dc.rights.holder© 2018 The Authors.
dc.rights.licenseThis work is licensed under a Creative Commons Attribution 3.0 United States License.
dc.sourceAdvanced Science, 2018, Vol. 5, No. 6.
dc.subjectcarbon diffusion
dc.subjectgraphene nucleation
dc.subjectpercolation
dc.subjectCuNi alloys
dc.subjectIngram School of Engineering
dc.titleHow Low Nucleation Density of Graphene on CuNi Alloy is Achieved
dc.typeArticle

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