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. 2019 Nov 21;9:17268. doi: 10.1038/s41598-019-53873-0

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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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TEM images of (a) ZnO nanowires having in the inset a SAED pattern proving the ZnO wurtzite phase and of (b-d) ZnO-Cu_xO core-shell nanowires with different shell thicknesses (with (b) ZnO-Cu_xO_1, (c) ZnO-Cu_xO_2 and (d) ZnO-Cu_xO_3), (e–h) Elemental maps of the same ZnO-Cu_xO_3 nanowires region, indicating spatially-resolved elemental distribution of Zn (green), Cu (red) O (blue), and their superposition, (i) STEM image, (j) EDS line profile analysis by STEM mode and (k) HRTEM image of area 1 of a ZnO-Cu_xO core-shell nanowire.