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. 2019 Nov 8;10:5084. doi: 10.1038/s41467-019-13053-0

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Acoustic properties of wood films. a Schematic of the vibrational frequency response measurement system. Insets: photographs of the commercial polymer diaphragm and ultrathin wood film. b The vibrational frequency response characteristics of the ultrathin wood film (50 μm) and the commercial polymer (80 μm) diaphragms. c, d The (0, 1) mode shapes of the polymer (80 μm) and ultrathin wood film (50 μm) diaphragms, respectively. e Comparison of the corresponding displacement and first resonance frequency of the ultrathin wood film (50 μm) and polymer (80 μm) diaphragms. f The vibrational frequency response characteristics of the ultrathin wood film at different thicknesses. g The corresponding displacement and first resonance frequency as a function of the thickness for the wood films