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나노 구조 물리 연구단
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Large local lattice expansion in graphene adlayers grown on copper

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Title
Large local lattice expansion in graphene adlayers grown on copper
Author(s)
Chaoyu Chen; José Avila; Hakim Arezki; Van Luan Nguyen; Jiahong Shen; Marcin Mucha-Kruczyński; Fei Yao; Mohamed Boutchich; Yue Chen; Young Hee Lee; Maria C. Asensio
Publication Date
2018-05
Journal
NATURE MATERIALS, v.17, no.5, pp.450 - 455
Publisher
NATURE PUBLISHING GROUP
Abstract
Variations of the lattice parameter can significantly change the properties of a material, and, in particular, its electronic behaviour. In the case of graphene, however, variations of the lattice constant with respect to graphite have been limited to less than 2.5% due to its well-established high in-plane stiffness. Here, through systematic electronic and lattice structure studies, we report regions where the lattice constant of graphene monolayers grown on copper by chemical vapour deposition increases up to similar to 7.5% of its relaxed value. Density functional theory calculations confirm that this expanded phase is energetically metastable and driven by the enhanced interaction between the substrate and the graphene adlayer. We also prove that this phase possesses distinctive chemical and electronic properties. The inherent phase complexity of graphene grown on copper foils revealed in this study may inspire the investigation of possible metastable phases in other seemingly simple heterostructure systems © 2018 Macmillan Publishers Limited, part of Springer Nature. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/4535
ISSN
1476-1122
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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