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Dual-Network Conductive Eutectogels with Enhanced Stretchability and Stability for Flexible Sensing.

Dongshu Chen1,2, Bai Wang2,3, Yue Liu1,2

  • 1Center for Molecular Science and Engineering, College of Science, Northeastern University, Shenyang 110819, P. R. China.

ACS Applied Materials & Interfaces
|August 27, 2025
PubMed
Summary

Researchers developed a novel composite gel using polyacrylamide, polysaccharides, and deep eutectic solvents for advanced flexible strain sensors. This material offers high stretchability and durability for wearable electronics and human motion monitoring.

Keywords:
environmental stabilityeutectogelflexible sensorsliquid metalpolysaccharide polyelectrolyte

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Flexible strain sensors are crucial for wearable electronics and human-machine interfaces.
  • Existing sensors often face limitations in stretchability, durability, and environmental stability.
  • Developing advanced materials is essential to overcome these challenges.

Purpose of the Study:

  • To synthesize and characterize a novel dual-network composite gel for high-performance flexible strain sensors.
  • To investigate the effect of deep eutectic solvents (DES) on gel properties and stability.
  • To evaluate the potential of the developed gel in real-world applications.

Main Methods:

  • A dual-network composite gel was synthesized using polyacrylamide (PAM), polysaccharides (sodium alginate/xanthan gum), and deep eutectic solvents (DES).
  • Gallium-indium alloy (EGaIn) was incorporated as a conductive filler.
  • A solvent substitution strategy was employed, replacing water with DES.
  • The gel's mechanical, electrical, and stability properties were systematically evaluated.

Main Results:

  • The composite gel achieved an elongation at break of 790% and a tensile strength of 25 MPa.
  • A gauge factor (GF) of 3.62 at 150% strain demonstrated excellent strain sensitivity.
  • The gel exhibited remarkable environmental stability, resistance to freezing, and minimal swelling.
  • Over 500 cycles, the sensor showed rapid response/recovery times and excellent cyclic stability.

Conclusions:

  • The developed eutectogel composite demonstrates superior performance for flexible strain sensing applications.
  • Its high stretchability, mechanical toughness, and environmental stability make it ideal for wearable sensors.
  • The gel's successful application in human motion monitoring and human-computer interaction validates its potential for next-generation technologies.