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다차원 탄소재료 연구단
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How Low Nucleation Density of Graphene on CuNi Alloy is Achieved

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Title
How Low Nucleation Density of Graphene on CuNi Alloy is Achieved
Author(s)
Yifan Liu; Tianru Wu; Yuling Yin; Xuefu Zhang; Qingkai Yu; Debra J. Searles; Feng Ding; Qinghong Yuan; Xiaoming Xie
Publication Date
2018-06
Journal
ADVANCED SCIENCE, v.5, no.6, pp.1700961 -
Publisher
WILEY
Abstract
CuNi 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 © 2018 The Authors.
URI
https://pr.ibs.re.kr/handle/8788114/5564
ISSN
2198-3844
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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20. Liu_et_al-2018-Advanced_Science.pdfDownload

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