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. 2016 Nov 21;9(2):15. doi: 10.1007/s40820-016-0116-2

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Characterization of TiO₂ nanowires. a Top view SEM image (inset, statistical summary of diameters of ~ 100 nanowires); b HRTEM image, yellow arrows indicate the crystalline defects (inset, TEM image of TiO₂ nanowires); c Raman spectrum; d XRD results; e Ti 2p XPS spectrum; and f O 1s XPS spectrum