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Detecting Subtle Vibrations Using Graphene-Based Cellular Elastomers.

M Bulut Coskun1, Ling Qiu1, Md Shamsul Arefin1

  • 1Laboratory for Micro Systems, Department of Mechanical and Aerospace Engineering, §Department of Materials Science and Engineering, and ⊥Biomedical Integrated Circuits and Sensors Department of Electrical and Computer Engineering, Monash University , Melbourne, Victoria 3800, Australia.

ACS Applied Materials & Interfaces
|March 24, 2017
PubMed
Summary
This summary is machine-generated.

New graphene elastomer sensors detect vibrations as accelerometers (20-300 Hz) and microphones (300-20,000 Hz). These metal-free flexible sensors offer high acceleration sensitivity, outperforming some silicon-based microelectromechanical systems.

Keywords:
accelerometersflexible sensorsgraphene elastomermicrophonesvibration sensor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Flexible sensors are crucial for detecting subtle mechanical stimuli.
  • Graphene elastomers offer unique properties for advanced sensor applications.
  • Existing sensors often contain metal parts, limiting their stealth capabilities and performance.

Purpose of the Study:

  • To develop ultralight graphene elastomer-based flexible sensors for vibration detection.
  • To demonstrate the dual functionality of the sensor as both an accelerometer and a microphone.
  • To evaluate the sensor's performance, including acceleration sensitivity and frequency range.

Main Methods:

  • Fabrication of ultralight sensors using graphene elastomer composites.
  • Testing the sensor's performance as an accelerometer within a 20-300 Hz bandwidth.
  • Assessing the sensor's capability as a microphone for sound pressures from 300 to 20,000 Hz.
  • Characterization of the sensor's acceleration sensitivity and comparison with existing technologies.

Main Results:

  • The developed sensor effectively detects subtle vibrations across a broad frequency range.
  • The device functions as both an accelerometer with a sensitivity of 2.6 mV/g and a microphone.
  • The sensor operates across tested frequency bands of 20-300 Hz (accelerometer) and 300-20,000 Hz (microphone).
  • The metal-free design ensures undetectability by external sources.

Conclusions:

  • Ultralight graphene elastomer sensors offer a versatile and high-performance solution for vibration and sound detection.
  • The metal-free, flexible nature of these sensors provides advantages in stealth applications.
  • The demonstrated performance is comparable or superior to rigid silicon-based microelectromechanical systems (MEMS) accelerometers.