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. 2018 Mar 23;8(4):188. doi: 10.3390/nano8040188

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© 2018 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) The piezoelectric coefficient of GaN and ZnO NWs as a function of their diameter. Reproduced with permission from [94]. American Chemical Society, 2011; (b) The output electrical potential vs. aspect ratio of ZnO NWs controlled at constant diameter of 50 nm and changing the NW length from 600 to 6000 nm. Reproduced with permission from [95]. John Wiley and Sons, 2011; (c) The GF of InAs NWs with different diameters. Reproduced with permission from [24]. John Wiley and Sons, 2015; (d) The size-dependent piezoelectric coefficient of BaTiO₃ NW. Reproduced with permission from [96]. IOP Publishing Ltd., 2010.