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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Highly Sensitive Piezoresistive Graphene-Based Stretchable Composites for Sensing Applications.

P Costa1,2, S Gonçalves1,3,4, H Mora1,5

  • 1Center of Physics , University of Minho , 4710-057 Braga , Portugal.

ACS Applied Materials & Interfaces
|November 15, 2019
PubMed
Summary

Graphene-based polymer composites show promise for smart sensors. Styrene-ethylene-butylene-styrene (SEBS) composites with graphene oxide (GO) and reduced graphene oxide (rGO) exhibit excellent piezoresistive properties for strain sensing applications.

Keywords:
graphene-based materialsmultifunctional materialsnanocompositespiezoresistivesmart materialsthermoplastic elastomers

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Advanced polymer composites require tailored filler properties for enhanced functionality.
  • Graphene derivatives offer tunable electrical conductivity for smart material development.
  • Styrene-ethylene-butylene-styrene (SEBS) is a versatile thermoplastic elastomer for composite applications.

Purpose of the Study:

  • To investigate the development of high-performance polymer-based smart composite materials using graphene fillers.
  • To tailor the electrical conductivity and piezoresistive properties of SEBS nanocomposites.
  • To evaluate the potential of these composites for strain sensor applications.

Main Methods:

  • Synthesis of SEBS nanocomposites incorporating graphene oxide (GO), reduced graphene oxide (rGO), and graphene nanoplatelets (G-NPLs).
  • Characterization of electrical conductivity and determination of percolation thresholds for different graphene fillers.
  • Evaluation of piezoresistive behavior and gauge factors under varying strain levels.

Main Results:

  • Electrical conductivity percolation thresholds were observed around 2 wt% for GO and rGO in SEBS.
  • G-NPLs showed minimal change in conductivity up to 6 wt% filler content.
  • GO/SEBS and rGO/SEBS composites demonstrated high piezoresistivity with gauge factors up to 120 at 10% strain.

Conclusions:

  • GO/SEBS and rGO/SEBS composites exhibit significant potential as a new generation of materials for strain sensor applications.
  • The tunable electrical and piezoresistive properties make these composites suitable for advanced sensing technologies.
  • Demonstrated implementation in a hand glove prototype highlights practical applicability in wearable electronics and motion monitoring.