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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...

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Related Experiment Video

Updated: Jun 1, 2026

Development of a 3D Graphene Electrode Dielectrophoretic Device
11:15

Development of a 3D Graphene Electrode Dielectrophoretic Device

Published on: June 22, 2014

Graphene-on-paper sound source devices.

He Tian1, Tian-Ling Ren, Dan Xie

  • 1Institute of Microelectronics, Tsinghua University, Beijing 100084, China.

ACS Nano
|May 20, 2011
PubMed
Summary
This summary is machine-generated.

Graphene can now emit sound, expanding its use in acoustics. Thinner graphene sheets produce higher sound pressure levels (SPL) via a thermoacoustic effect, enabling new applications.

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Area of Science:

  • Acoustics
  • Materials Science
  • Nanotechnology

Background:

  • Graphene's unique properties are being explored for novel applications.
  • The acoustic potential of graphene has not been extensively studied.

Purpose of the Study:

  • To investigate sound emission from graphene.
  • To develop graphene-based sound source devices.
  • To analyze the factors influencing graphene's acoustic performance.

Main Methods:

  • Fabrication of graphene-on-paper sound source devices with varying graphene thickness (100, 60, 20 nm).
  • Measurement of sound emission characteristics (SPL, frequency response, efficiency) in the far-field.
  • Development of a theoretical model for a multilayer air/graphene/paper/PCB structure.
  • Analysis using infrared thermal imaging to confirm the thermoacoustic effect.

Main Results:

  • Graphene successfully emits sound, demonstrating a flat frequency response from 20-50 kHz.
  • Thinner graphene sheets yield higher sound pressure levels (SPL) due to lower heat capacity per unit area (HCPUA).
  • Theoretical model predictions align well with measured sound pressure level (SPL) and efficiency.
  • The thermoacoustic effect is identified as the primary working principle.

Conclusions:

  • Graphene-on-paper devices are a viable and high-performance sound source.
  • Sound performance is dependent on the conductor's HCPUA and substrate's thermal properties.
  • These devices offer reliability, flexibility, and simple structure for diverse applications in electronics and medicine.