Custom‐Built Graphene Acoustic‐Absorbing Aerogel for Audio Signal Recognition. Issue 16 (27th July 2021)

• Record Type: Journal Article
• Authors: Li, Zengling; Yang, Hongsheng; Lupi, Stefano; Li, Yuanyuan; Sun, Xiaotong; Liu, Xiaoting; Chen, Nan; Cheng, Huhu; Qu, Liangti
• Is Part Of: Advanced materials interfaces. Volume 8:Issue 16(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-27
• Subjects: acoustic‐absorbing materials -- audio signals recognition -- graphene aerogel; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202100227
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Porous acoustic‐absorbing materials currently used to solve noise pollution mainly include polyurethane composite materials and porous fibers which are dedicated to achieving good noise reduction effects in a wide frequency range. Nevertheless, traditional porous acoustic‐absorbing materials face irreparable defects as required by the multifunction and high energy efficiency. The reason is nothing more than the internal microstructure of conventional acoustic‐absorbing materials is difficult to be precisely controlled by macroscopic operations, resulting in poor mass transfer capability and low energy conversion efficiency. In this work, by customized design of controlled mechanical foaming and atmospheric drying technique, a custom‐built graphene aerogel (cGA) as acoustic‐absorbing material with an acoustic absorption coefficient approaching 100% is prepared, which can efficiently absorb noise at an assigned frequency (2000–6000 Hz range) according to individual needs. Through simple stacking, cGAs expand from single‐frequency absorption to multi‐frequency high‐efficiency absorption. What is more significant is that a single aerogel has electrical signal responses of different intensities to sounds of different frequencies, which allows to build the aerogel into an acoustic detector to convert noise signals into electrical signals and realize the goal of sound fingerprint detection. Abstract : Custom‐built graphene aerogel (cGA) can accurately absorb the specified sound frequencies in the range of 2000–6000 Hz, and then extend the single frequency absorption to multi‐frequency absorption by simple superposition combination. cGA is also found to be a new type of acoustic absorption material with audio signal recognition function.