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Related Experiment Video

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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Thermally and electrically conductive multifunctional sensor based on epoxy/graphene composite.

Sensen Han1,2, Aron Chand1, Sherif Araby1,3,4

  • 1College of Aerospace Engineering, Shenyang Aerospace University, Shenyang 110136, People's Republic of China.

Nanotechnology
|October 23, 2019
PubMed
Summary

A novel flexible epoxy/graphene nanoplatelet (GnP) composite film exhibits exceptional mechanical strength and electrical conductivity. This advanced material demonstrates high sensitivity to mechanical loads and temperature, making it ideal for universal sensor applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Flexible electronics is a rapidly advancing field with significant future potential.
  • Development of robust and multifunctional materials is crucial for next-generation electronic devices.

Purpose of the Study:

  • To fabricate a mechanically strong and flexible epoxy/graphene nanoplatelet (GnP) composite film.
  • To investigate the electrical, thermal, mechanical, and sensing properties of the composite film.

Main Methods:

  • Fabrication of epoxy/GnP composite films.
  • Characterization of electrical conductivity, thermal conductivity, and mechanical properties (Young's modulus, tensile strength).
  • Evaluation of sensing performance under various mechanical loads (strain, bending, twisting, compression) and temperature variations.

Main Results:

  • Achieved a percolation threshold of electrical conductivity at 1.08 vol% GnPs.
  • High thermal conductivity of 1.07 W m-1 K-1 at 10 vol% GnPs.
  • Significant improvements in Young's modulus (1344%) and tensile strength (66.7%) at 10 vol% GnPs.
  • Demonstrated high sensitivity to mechanical loads with gauge factors up to 6 and reliable response to bending, twisting, and compression.
  • Exhibited stable temperature sensing capabilities between 30-75 °C with a sensitivity coefficient of 0.0063 °C-1.
  • Showcased excellent reliability over 5.5 × 103 cycles.

Conclusions:

  • The developed flexible epoxy/GnP composite film possesses remarkable mechanical, electrical, and thermal properties.
  • The film's high sensitivity and reliability make it a promising candidate for multifunctional sensor applications.
  • Potential applications span across aerospace, automotive, and civil engineering sectors.