Thermoacoustic and photoacoustic characterizations of few-layer graphene by pulsed excitations

We characterized the thermoacoustic and photoacoustic properties of large-area, few-layer graphene by pulsed microwave and optical excitations. Due to its high electric conductivity and low heat capacity per unit area, graphene lends itself to excellent microwave and optical energy absorption and ac...

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Bibliographic Details
Published in:Applied physics letters 2016-04, Vol.108 (14)
Main Authors: Witte, Russell S., Xin, Hao
Format: Article
Language:English
Subjects:
Acoustic absorption
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
ELECTRIC CONDUCTIVITY
Electrical resistivity
ENERGY ABSORPTION
EXCITATION
GRAPHENE
LASERS
LAYERS
Mathematical models
MICROWAVE RADIATION
Optical properties
Optical radiation
PULSES
SIGNALS
SIMULATION
SPECIFIC HEAT
Thermoacoustics
TWO-DIMENSIONAL SYSTEMS
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Summary:We characterized the thermoacoustic and photoacoustic properties of large-area, few-layer graphene by pulsed microwave and optical excitations. Due to its high electric conductivity and low heat capacity per unit area, graphene lends itself to excellent microwave and optical energy absorption and acoustic signal emanation due to the thermoacoustic effect. When exposed to pulsed microwave or optical radiation, distinct thermoacoustic and photoacoustic signals generated by the few-layer graphene are obtained due to microwave and laser absorption of the graphene, respectively. Clear thermoacoustic and photoacoustic images of large-area graphene sample are achieved. A numerical model is developed and the simulated results are in good accordance with the measured ones. This characterization work may find applications in ultrasound generator and detectors for microwave and optical radiation. It may also become an alternative characterization approach for graphene and other types of two-dimensional materials.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4945661