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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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Crystal structure analysis and morphological observation of copper NPs. (a) XRD patterns of the copper NPs obtained with different molar ratios of [NTA H 2Na]/[Cu(OH)₂]: (i) Cu1: 0; (ii) Cu2: 1.69; (iii) Cu3: 2.0; and (iv) Cu4: 2.4. All reactions were carried out at 25 °C for 1 h. (b) SEM images of the copper NPs formed by the changing the molar ratio of [NTA H 2Na]/[Cu(OH)₂]: (i) Cu1: 0; (ii) Cu2: 1.69; (iii) Cu3: 2.0; and (iv) Cu4: 2.4. The scale bar shown in (iv) is the same for (i)–(iii). Insets in (iii) and (iv) are the 2-fold magnified images.