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. 2017 Dec 11;7:17290. doi: 10.1038/s41598-017-17791-3

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The waveforms of the detected voltages from the stretched G/PVDF/G generator under 1.2 MPa stress were investigated, depending on different acoustic environments. (a) No acoustic excitation was applied intentionally, and a small noise signal (20 mV_pp) with 60 Hz was detected. (b) When the acoustic excitation (86.7 dB) was applied at 100 Hz, the device generated 95 mV_pp. (c) When the acoustic wave (83.7 dB) at resonance frequency (220 Hz) was applied, 1.12 V_pp was detected. After that, the input voltage was increased to 5 V, and the peak-to-peak output voltage spectra were measured under tensile stresses by different weights: (d) 70 g, (e) 170 g, (f) 370 g, (g) 570 g, (h) 870 g, and (i) 1070 g.