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. 2019 Nov 6;9:16141. doi: 10.1038/s41598-019-52522-w

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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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(a) XPS spectra of TiO₂ indicating the two main peaks of Ti⁴⁺; Ti⁴⁺ 2p_3/2 (binding energy of 458.1 eV), Ti⁴⁺2p_1/2 (binding energy of 463.9 eV) and a shoulder peak at binding energy of 459.1 eV corresponding to Ti³⁺ 2p_1/2 in Ti₂O₃. (b) XPS data of 15 mg/mL added BSA protein (TiO₂ + BSA).