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. 2019 May 10;19(9):2170. doi: 10.3390/s19092170

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© 2019 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) Temperature change vs. time plot for the nanofiber membrane (NFM)-based nanogenerator, (b) the corresponding dT/dt plot, (c) the corresponding output current vs. time plot from the device, (d) measured output current of the nanogenerator when heated from different initial temperatures, (e) the output current from the nanogenerator when subjected to different mechanical stresses (varying the bending), and (f) the output current from the pyroelectric, piezoelectric, and simultaneous effects (hybrid) when subjected to temperature changes (heating and cooling for 3 s each) and mechanical stresses (f = 2.5 Hz), respectively (reproduced with permission) [37].