Broad Bandwidth, Self‐Powered Acoustic Sensor Created by Dynamic Near‐Field Electrospinning of Suspended, Transparent Piezoelectric Nanofiber Mesh
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Open access
Date
2020-07-16Type
- Journal Article
Abstract
Freely suspended nanofibers, such as spider silk, harnessing their small diameter (sub‐micrometer) and spanning fiber morphology, behave as a nonresonating acoustic sensor. The associated sensing characteristics, departing from conventional resonant acoustic sensors, could be of tremendous interest for the development of high sensitivity, broadband audible sensors for applications in environmental monitoring, biomedical diagnostics, and internet‐of‐things. Herein, a low packing density, freely suspended nanofiber mesh with a piezoelectric active polymer is fabricated, demonstrating a self‐powered acoustic sensing platform with broad sensitivity bandwidth covering 200–5000 Hz at hearing‐safe sound pressure levels. Dynamic near‐field electrospinning is developed to fabricate in situ poled poly(vinylidene fluoride‐co‐trifluoroethylene) (P(VDF‐TrFE)) nanofiber mesh (average fiber diameter ≈307 nm), exhibiting visible light transparency greater than 97%. With the ability to span the nanomesh across a suspension distance of 3 mm with minimized fiber stacking (≈18% fiber packing density), individual nanofibers can freely imitate the acoustic‐driven fluctuation of airflow in a collective manner, where piezoelectricity is harvested at two‐terminal electrodes for direct signal collection. Applications of the nanofiber mesh in music recording with good signal fidelity are demonstrated. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000420939Publication status
publishedExternal links
Journal / series
SmallVolume
Pages / Article No.
Publisher
WileySubject
bioinspired acoustics; energy harvesting; nanogenerators; nanosensors; P(VDF‐TrFE)More
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