High-Efficiency and Low Distortion Photoacoustic Effect
in 3D Graphene Sponge
Giorgianni, F (Giorgianni, Flavio)[ 1,2 ] ; Vicario, C (Vicario, Carlo)[ 2 ] ; Shalaby, M (Shalaby, Mostafa)[ 2 ] ; Tenuzzo, LD (Tenuzzo, Lorenzo Donato)[ 1 ] ; Marcelli, A (Marcelli, Augusto)[ 3,4,5 ] ; Zhang, TF (Zhang, Tengfei)[ 6,7,8 ] ; Zhao, K (Zhao, Kai)[ 6,7,8 ] ; Chen, YS (Chen, Yongsheng)[ 6,7,8 ] ; Hauri, C (Hauri, Christoph)[ 2 ] ; Lupi, S (Lupi, Stefano)[ 1 ]
ADVANCED
FUNCTIONAL MATERIALS, 2018, 28(2): 文献号: 1702652
DOI: 10.1002/adfm.201702652
WOS:000419454000020
Abstract
The
conversion of light in sound plays a crucial role in spectroscopy, applied
physics, and technology. In this paper, light-sound conversion in 3D graphene
sponge through a photo-thermoacoustic mechanism is reported. It is shown that
the unique combination of mechanical, optical, and thermodynamic properties of
graphene assembled in a 3D sponge structure allows an unprecedented high
efficiency conversion independent of light wavelength from infrared to
ultraviolet. As a first application of this effect, a photothermal based
graphene sponge loudspeaker is demonstrated, providing a full digital operation
for frequencies from acoustic to ultrasound. The present results suggest a new
pathway for light generation and control of sound and ultrasound signals
potentially usable in a variety of new technological applications from
high-fidelity loudspeaker and radiation detectors to medical devices.
