Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/79194
Title: How low nucleation density of graphene on CuNi alloy is achieved
Authors: Liu, YF
Wu, TR
Yin, YL
Zhang, XF
Yu, QK
Searles, DJ
Ding, F 
Yuan, QH 
Xie, XM
Issue Date: 2018
Source: Advanced science, June 2018, v. 5, no. 6, 1700961, p. 1-8
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.
Keywords: Carbon diffusion
CuNi alloys
Graphene nucleation
Percolation
Publisher: Wiley-VCH
Journal: Advanced science 
ISSN: 2198-3844
DOI: 10.1002/advs.201700961
Rights: © 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
The following publication Liu, Y., Wu, T., Yin, Y., Zhang, X., Yu, Q., Searles, D. J., ... & Xie, X. (2018). How Low Nucleation Density of Graphene on CuNi Alloy is Achieved. Advanced Science, 5(6) 1700961, 1-8 is available at https://doi.org/10.1002/advs.201700961
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