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. 2018 Jul 3;13:191. doi: 10.1186/s11671-018-2593-3

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 4 — Research result of the triboelectric voltage output signal and the vibration amplitude from a electrode #2, b electrode #5, and c electrode #8, which was measured by LDV system and oscilloscope in the frequency ranging from 20 to 3000 Hz, and a distribution of the vibration displacement and the triboelectric voltage output signal were closely overlapped all over the frequency bandwidth. d Experimental results of the relationship between the electrode number and the local resonance frequency of the PTFE membrane