Single-digit-micrometer thickness wood speaker

Wentao Gan, Chaoji Chen, Hyun-Tae Kim, Zhiwei Lin, Jiaqi Dai, Zhihua Dong, Zhan Zhou, Weiwei Ping, Shuaiming He, Shaoliang Xiao, Miao Yu () and Liangbing Hu ()
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Wentao Gan: University of Maryland
Chaoji Chen: University of Maryland
Hyun-Tae Kim: University of Maryland
Zhiwei Lin: University of Maryland
Jiaqi Dai: University of Maryland
Zhihua Dong: University of Maryland
Zhan Zhou: University of Maryland
Weiwei Ping: University of Maryland
Shuaiming He: University of Maryland
Shaoliang Xiao: University of Maryland
Miao Yu: University of Maryland
Liangbing Hu: University of Maryland

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Thin films of several microns in thickness are ubiquitously used in packaging, electronics, and acoustic sensors. Here we demonstrate that natural wood can be directly converted into an ultrathin film with a record-small thickness of less than 10 μm through partial delignification followed by densification. Benefiting from this aligned and laminated structure, the ultrathin wood film exhibits excellent mechanical properties with a high tensile strength of 342 MPa and a Young’s modulus of 43.6 GPa, respectively. The material’s ultrathin thickness and exceptional mechanical strength enable excellent acoustic properties with a 1.83-times higher resonance frequency and a 1.25-times greater displacement amplitude than a commercial polypropylene diaphragm found in an audio speaker. As a proof-of-concept, we directly use the ultrathin wood film as a diaphragm in a real speaker that can output music. The ultrathin wood film with excellent mechanical property and acoustic performance is a promising candidate for next-generation acoustic speakers.

Date: 2019
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DOI: 10.1038/s41467-019-13053-0

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