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. 2014 Mar 11;7(3):2044–2061. doi: 10.3390/ma7032044

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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 9. — (a) SEM images of p-type ZnO:P nanorods on a glass substrate; (b) the piezoelectric output potential measured from sound-driven piezoelectric nanogenerators (SPNGs) consisting of ITO-coated flexible polyethylene terephthalate (PET) as a top electrode and ZnO nanorods before and after P-doping; (c) a polymer-dispersed LC (PDLC) device (4 cm × 5 cm) switched on (left) by an SPNG and (right) before being switched on using an SPNG, respectively. Reprinted with permission from [27]. Copyright 2014, Royal Society of Chemistry.