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. 2014 Nov 24;9(11):e113477. doi: 10.1371/journal.pone.0113477

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© 2014 Seo et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A, B) Ti2p spectra, (C, D) O1s spectra and (E, F) C1s spectra. (G) Atomic percentage of each element on the surface of TiO₂ nanotubes before and after nitrogen- or air-based NTAPPJ treatment. NP0 and AP0: untreated TiO₂ nanotubes with no treatment (control group); NP2: TiO₂ nanotubes with 2-min nitrogen-based NTAPPJ; NP10: TiO₂ nanotubes with 10-min nitrogen-based NTAPPJ; AP2: TiO₂ nanotubes with 2-min air-based NTAPPJ; AP10: TiO₂ nanotubes with 10-min air-based NTAPPJ.