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. 2018 Jun 21;10(7):692. doi: 10.3390/polym10070692

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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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The performance of sensing sound. The ISSE is clamped on a loudspeaker to test the sound-sensing capability as illustrated in (a) optical photo. (b) The relative voltage output detected by four ISSE (blue dotted rectangle) and one ISSE (blue dotted rectangle). (c) The relative voltage output as a function of the PVDF solution concentration from 8% to 32%. The x-y stage speed is fixed at 60 mm/s. (d) The relative voltage output as a function of the x-y stage speed from 20 to 100 mm/s. The PVDF solution concentration is fixed at 16%. The occurrence of voltage peak coincides with the NFES parameters of 16% PVDF solution and at 60 mm/s motion speed, which is the defect-free morphology and higher quality. The recorded (e) relative voltage output and (f) current output. Both electrical signals increase with the increase of the sound loudness of the loudspeaker.