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. 2017 Mar 21;7:255. doi: 10.1038/s41598-017-00366-7

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© The Author(s) 2017

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XPS spectra of pure TiO₂, 17 nm-Ag₂S@TiO₂ and 17 nm-Ag₂S@TiO₂ + UV-O₃ samples. (a) Ti 2p, (b) O 1 s, (c) Ag 3d, and (d) S 2p.