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. 2016 Apr 22;6:24870. doi: 10.1038/srep24870

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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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SEM images of ZNRs grown with preheating method for (a) 5 mins preheating, (b) 10 mins preheating, (c) 15 mins preheating, (d) Schematics of the erosion and deposition of Zn²⁺ in the 15 mins preheating method, and (e) Schematics of the ZNRs formation and deposition phenomena in the preheating process.