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. 2016 Feb 24;11:104. doi: 10.1186/s11671-016-1309-9

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© Cai et al. 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. 3 — a XRD patterns and b Raman scattering spectra of bare TiO₂ NTs (1), 10-cycle ZnO/TiO₂ NTs (2), and 25-cycle (3) ZnO/TiO₂ NTs. The XRD patterns and Raman scattering spectra are moved vertically for clarity