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Actively tunable acoustic metamaterials have attracted ever increasing attention. However, their tunable frequency range is quite narrow (tens of Hz) even under ultrahigh applied voltage (about 1,000 V). Here, we report a superbroad-band actively tunable acoustic metamaterials with the bandwidth over 400 Hz under a low voltage. In the actively tunable acoustic metamaterials, the acoustic membrane is a laminated nanocomposite consisting of a poly (ethylene terephthalate) (PET) and super-aligned carbon nanotube (CNT) drawn from CNT forest array. The laminated nanocomposite membrane exhibits adjustable acoustic properties, whose modulus can be adjusted by applying external electric field. The maximum frequency bandwidth of PET/CNT nanocomposite membrane reaches 419 Hz when applying an external DC voltage of 60 V. Our actively tunable acoustic metamaterials with superbroad-band and lightweight show very promising foreground in noise reduction applications.

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Publication history
Copyright
Acknowledgements

Publication history

Received: 23 June 2020
Revised: 02 August 2020
Accepted: 10 August 2020
Published: 05 January 2021
Issue date: January 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (NSFC) (Nos. 52002201, 52008223 and 51772063), Open Fund of innovation institute for Sustainable Maritime Architecture Research and Technology, Qingdao University of Technology (Nu.2020-035), and Shenzhen Science and Technology Program (No. KQTD2016112814303055).

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