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. 2018 Sep 13;8:13721. doi: 10.1038/s41598-018-31903-7

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Graphene encapsulation on Cu NWs. (a) Atomic structure of Cu@graphene NW, where the graphene shell layer is encapsulated on the {100} sidewall of Cu NW. (b) SEM image, (c) TEM image, and (d) high resolution TEM image of Cu@graphene NW. The inset is the SAED image showing the growth direction and structure of Cu@graphene NW. (e) TEM image of free-standing graphene nanotube after the removal of Cu core. (f) Scanning TEM image of interlaced Cu@graphene NWs. The junction is firmly fused after nano-welding treatment. (g) and (h) Elemental mapping images of Cu and C, respectively.