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Issue 5, 2019
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Highly efficient thermophones based on freestanding single-walled carbon nanotube films

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Abstract

We present the state-of-the-art performance of air-coupled thermophones made of thin, freestanding films of randomly oriented single-walled carbon nanotubes (SWCNTs). The work demonstrates both experimentally and theoretically that extremely low heat capacity per unit area of SWCNT films allows centimeter-sized thermophones to achieve record sound pressures (normalized to the input power and geometry) in the frequency range of 1–100 kHz. Our SWCNT films have an aerogel structure. We systematically investigated their thermoacoustic performance as a function of the film thickness and purity. On the theoretical side, we obtained an analytic formula for the sound pressure in the ultrasound region and confirmed it by experiments and numerical simulations.

Graphical abstract: Highly efficient thermophones based on freestanding single-walled carbon nanotube films

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Supplementary files

Article information


Submitted
12 Mar 2019
Accepted
07 May 2019
First published
07 May 2019

Nanoscale Horiz., 2019,4, 1158-1163
Article type
Communication
Author version available

Highly efficient thermophones based on freestanding single-walled carbon nanotube films

S. A. Romanov, A. E. Aliev, B. V. Fine, A. S. Anisimov and A. G. Nasibulin, Nanoscale Horiz., 2019, 4, 1158
DOI: 10.1039/C9NH00164F

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