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. 2018 Aug 17;9(8):407. doi: 10.3390/mi9080407

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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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Effects of the output power of TENGs caused by embedded TiO_2−x NPs. (a) Output voltage and (b) current of the TiO_2−x NP embedded TENGs as a function of the TiO_2−x NPs embedded weight ratio (measured under a relative humidity of ~55%). Influence of external load resistance on the (c) output voltage/current and (d) power density of the TENG under a pushing force of 5 N and a pushing frequency of 5 Hz.