Broad Bandwidth, Self-Powered Acoustic Sensor Created by Dynamic Near-Field Electrospinning of Suspended, Transparent Piezoelectric Nanofiber Mesh.

Autor: Wang W; The Nanoscience Center, Department of Engineering, University of Cambridge, Cambridge, CB3 0FF, UK., Stipp PN; The Nanoscience Center, Department of Engineering, University of Cambridge, Cambridge, CB3 0FF, UK.; Institute of Robotics and Intelligent Systems, Swiss Federal Institute of Technology Zurich (ETH), Rämistrasse 101, Zürich, 8092, Switzerland., Ouaras K; The Nanoscience Center, Department of Engineering, University of Cambridge, Cambridge, CB3 0FF, UK., Fathi S; The Nanoscience Center, Department of Engineering, University of Cambridge, Cambridge, CB3 0FF, UK., Huang YYS; The Nanoscience Center, Department of Engineering, University of Cambridge, Cambridge, CB3 0FF, UK.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2020 Jul; Vol. 16 (28), pp. e2000581. Date of Electronic Publication: 2020 Jun 08.
DOI: 10.1002/smll.202000581
Abstrakt: 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.
(© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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