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Continuous epitaxy of single-crystal graphite films by isothermal carbon diffusion through nickel

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Title
Continuous epitaxy of single-crystal graphite films by isothermal carbon diffusion through nickel
Author(s)
Zhang, Zhibin; Ding, Mingchao; Ting Cheng; Qiao, Ruixi; Zhao, Mengze; Luo, Mingyan; Wang, Enze; Sun, Yufei; Zhang, Shuai; Li, Xingguang; Zhang, Zhihong; Mao, Hancheng; Liu, Fang; Fu, Ying; Liu, Kehai; Zou, Dingxin; Liu, Can; Wu, Muhong; Fan, Chuanlin; Zhu, Qingshan; Wang, Xinqiang; Gao, Peng; Li, Qunyang; Liu, Kai; Zhang, Yuanbo; Bai, Xuedong; Yu, Dapeng; Feng Ding; Wang, Enge; Liu, Kaihui
Publication Date
2022-12
Journal
NATURE NANOTECHNOLOGY, v.17, no.12, pp.1258 - 1264
Publisher
NATURE PORTFOLIO
Abstract
Multilayer van der Waals (vdW) film materials have attracted extensive interest from the perspective of both fundamental research' and technology(4-7). However, the synthesis of large, thick, single-crystal vdW materials remains a great challenge because the lack of out-of-plane chemical bonds weakens the epitaxial relationship between neighbouring layers'. Here we report the continuous epitaxial growth of single-crystal graphite films with thickness up to 100,000 layers on high-index, single-crystal nickel (Ni) foils. Our epitaxial graphite films demonstrate high single crystallinity, including an ultra-flat surface, centimetre-size single-crystal domains and a perfect AB-stacking structure. The exfoliated graphene shows excellent physical properties, such as a high thermal conductivity of similar to 2,880 W m(-1) K-1, intrinsic Young's modulus of similar to 1.0 TPa and low doping density of similar to 2.2 x 10(10) cm(-2). The growth of each single-crystal graphene layer is realized by step edge-guided epitaxy on a high-index Ni surface, and continuous growth is enabled by the isothermal dissolution-diffusion-precipitation of carbon atoms driven by a chemical potential gradient between the two Ni surfaces. The isothermal growth enables the layers to grow at optimal conditions, without stacking disorders or stress gradients in the final graphite. Our findings provide a facile and scalable avenue for the synthesis of high-quality, thick vdW films for various applications.
URI
https://pr.ibs.re.kr/handle/8788114/12520
DOI
10.1038/s41565-022-01230-0
ISSN
1748-3387
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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