title: Static behavior of a graphene-based sound-emitting device.
abstract: Due to the extremely high thermal conductivity and low heat capacity per unit area of graphene, it is possible to fabricate an efficient sound-emitting device based on the thermoacoustic effect with no mechanical vibration. In this paper, the fundamental performance of this new graphene sound-emitting device (G-SED) is investigated in terms of its static behavior. The sound amplitude mapping shows that the G-SED has good sound performance under 0.01 W. The sound frequency spectra measured at different distances and angles show that the G-SED has good sound directivity. It is possible to realize sound wave manipulation by using an array of G-SEDs. The relationship between the temperature of graphene and the sound frequency was investigated by a thermal imaging instrument. The fast transient sound response in real time was recorded by applying 60 μs short time multi-pulses and single-pulse. The stable sound emission at a constant sound pressure amplitude with low noise was observed for continuous operation under a fixed frequency over several hours. Such significant performances in this G-SED indicate broad applications, and shed light on the use of graphene in the field of acoustics.
authors.affiliation: Institute of Microelectronics, Tsinghua University, Beijing 100084, China.
authors.forename: He
authors.initials: H
authors.lastname: Tian
authors.forename: Dan
authors.initials: D
authors.lastname: Xie
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.forename: Tian-Ling
authors.initials: TL
authors.lastname: Ren
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Wang
authors.forename: Chang-Jian
authors.initials: CJ
authors.lastname: Zhou
authors.forename: Ping-Gang
authors.initials: PG
authors.lastname: Peng
authors.forename: Li-Gang
authors.initials: LG
authors.lastname: Wang
authors.forename: Li-Tian
authors.initials: LT
authors.lastname: Liu