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. 2021 Feb 2;11:2808. doi: 10.1038/s41598-020-80529-1

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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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XPS spectra of gold nanoformulations, (a) overall survey spectra, (b–d) Survey spectrum of AuNPs and corresponding high resolution spectra as follows (c) Au4f_5/2 and Au4f_7/2, (d) C1s, (e) O1s, (f–j) high resolution spectra of PEG functionalized AuNPs (f) Au4f, (g) S2p, (h) C1s, (i) N1s and (j) O1s and (k–p) Survey spectrum of gold based nanoformulations and corresponding high resolution spectra (k) survey spectrum, (l) Au4f, (m) S2p, (n) C1s, (o) N1s and (p) O1s.