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. 2021 Nov 9;11:21996. doi: 10.1038/s41598-021-01538-2

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© The Author(s) 2021

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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X-ray photoelectron spectra (XPS) of Fe₃O₄-K01 extracts. Survey scan XPS spectrum (A), Fe 2p (B) O1s (C), C1s (D) and N1s (E) spectra of the K01 extracts based synthesis of Fe₃O₄ nanoparticles. The black lines (little noisy) denote experimental raw data, the overlaid red line is the deconvoluted form of raw data (sum of all fitting data), the baseline is presented by blue color and other color lines are the fitting data.