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Strain Sensing Coatings for Large Composite Structures Based on 2D MXene Nanoparticles.

Gediminas Monastyreckis1, Anastasiia Stepura2, Yaryna Soyka2

  • 1Department of Mechanical Engineering, Kaunas University of Technology, Studentu St. 56, 51424 Kaunas, Lithuania.

Sensors (Basel, Switzerland)
|April 3, 2021
PubMed
Summary

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A novel strain-sensing coating using 2D MXene nanoparticles was developed for composite structures. This lightweight, processable coating shows potential for real-time strain monitoring in applications like wind turbine blades.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Composite Materials

Background:

  • Real-time strain monitoring of large composite structures, such as wind turbine blades, demands sensors that are scalable, processable, and lightweight.
  • Existing sensor technologies may not fully meet these requirements for demanding structural health monitoring applications.

Purpose of the Study:

  • To develop and characterize a novel strain-sensing coating based on 2D MXene nanoparticles for composite structures.
  • To evaluate the coating's performance under various conditions, including ambient variations, UV exposure, and mechanical loading.

Main Methods:

  • Synthesis of Ti3C2Tz MXene via hydrochloric acid and lithium fluoride etching of Ti3AlC2 MAX phase.
  • Spray-coating of MXene water solution onto epoxy and glass fiber-reinforced composites.
Keywords:
MXenescoatingscyclic loadingelectrical propertiesstrain sensors

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  • Characterization using optical microscopy, scanning electron microscopy, and electrical resistance measurements.
  • Evaluation of electromechanical response under tensile and cyclic loading.

    • Main Results:

    • The MXene coating exhibited stable electrical resistance across temperature variations but showed responsiveness to UV light (301-365 nm).
    • A gauge factor of 10.88 was achieved at 4% strain, demonstrating significant strain-sensing capability.
    • After 21,650 loading cycles, the coating showed a 16.25% increase in permanent resistance, with a more stable response to loading.

    Conclusions:

    • The developed MXene-based strain-sensing coating offers advantages in processability, scalability, lightweight nature, and adhesion for large composite structures.
    • The study provides novel insights into MXene coating sensitivity to surface roughness and electromechanical behavior under cyclic loading, crucial for future development.
    • This technology holds promise for advanced structural health monitoring in composite materials.