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. 2020 Oct 7;10:16680. doi: 10.1038/s41598-020-73497-z

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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UV–Vis spectra of Cu₂O NPs synthesised in the presence of lipopeptide microbial surfactant (a, black series) and in the absence of lipopeptide microbial surfactant (a, red series). Representative XRD patterns of the surfactant stabilized Cu₂O NPs (b, red line) compared to the bare Cu₂O NPs (b, black line), reflecting smaller size of the surfactant stabilized Cu₂O NPs.