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. 2014 Apr 9;7(4):2833–2881. doi: 10.3390/ma7042833

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 1. — Examples of zinc oxide structure: flower (a); rods (b); wires (c,d) (created based on [17,27,29] with permission from Elsevier Publisher and [11] AIP Publishing LLC).