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. 2019 Jan 29;9:899. doi: 10.1038/s41598-018-38422-5

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© The Author(s) 2019

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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Characterization of the surface and internal structures of Cu3. HR-TEM and HAADF-STEM images of Cu3. (a) An HR-TEM image of Cu3; (b) A close-up image of Cu3 shown in (a,c) A HAADF scanning image of the EDS analysis area. (d) copper K_α1; (e) carbon K_α1; (f) oxygen K_α1.