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. 2018 Jul 9;13:202. doi: 10.1186/s11671-018-2616-0

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© The Author(s). 2018

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. 7 — SEM images of ZnO nanoparticles obtained from 65% ZnCl₂ aqueous solution by reactivity with various hydroxides (a, NaOH; b, KOH; c, LiOH; d, NH₄OH)