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. 2017 Sep 8;8:488. doi: 10.1038/s41467-017-00620-6

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© The Author(s) 2017

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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Fig. 1 — Structural characterizations. The scale bars of a–c and (g1–i1) correspond to 1000 nm, that of (g2–i2) correspond to 500 nm, and that of (g3–h3) correspond to 2 nm. Representative SEM images of a Cu₂O cubes, b Cu₂O octahedral, and c Cu₂O rhombic dodecahedra. d XRD patterns, e Cu LMM AES spectra measured without exposure to air, and f in situ DRIFTS spectra of CO adsorption at 123 K of Cu₂O cubes (a1), octahedra (b1), rhombic dodecahedra (c1) and Cu cubes (a2), octahedra (b2) and rhombic dodecahedra (c2). Representative SEM, TEM and HRTEM images of (g1–g3) Cu cubes, (h1–h3) Cu octahedra and (i1–i3) Cu rhombic dodecahedra. The insets in the HRTEM images show the ED patterns of corresponding Cu nanocrystals. The lattice fringes of 1.80 and 2.08 Å, respectively, correspond to the spacing of Cu{200} and {111} crystal planes (JCPDS card NO. 89-2838)