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Wireless Sensor System Based on Organohydrogel Ionic Skin for Physiological Activity Monitoring.

Congcong Yang1, Chenchen Ji1, Fengjiao Guo1

  • 1State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, P. R. China.

ACS Applied Materials & Interfaces
|May 3, 2024
PubMed
Summary

This study developed a new poly(vinyl alcohol)-based conductive organohydrogel (PCEL5.0%) for advanced ionic skin (i-skin) applications. The enhanced material offers superior conductivity, mechanical strength, and stability for physiological monitoring and human-computer interaction.

Keywords:
frost resistanceinterfacial adherenceorganohydrogel i-skinphysiological activity detectionwireless sensor system

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Flexible Electronics

Background:

  • Supermolecular hydrogel ionic skin (i-skin) is promising for physiological detection but limited by poor conductivity, mechanical properties, adhesion, and freeze resistance.
  • Existing hydrogels struggle to meet the demands of complex environments and reliable flexible electronic applications.

Purpose of the Study:

  • To develop a novel multifunctional poly(vinyl alcohol)-based conductive organohydrogel (PCEL5.0%) with improved properties for flexible electronics.
  • To enhance ionic conductivity, mechanical performance, interfacial adhesion, and environmental stability of hydrogel-based i-skins.
  • To demonstrate the potential of the developed organohydrogel i-skin in physiological activity detection and human-computer interaction.

Main Methods:

  • A poly(vinyl alcohol)-based conductive organohydrogel (PCEL5.0%) was synthesized using sodium carboxymethyl cellulose (CMC-Na), ethylene glycol, and lithium chloride.
  • The organohydrogel's properties, including ionic conductivity, mechanical strength, interfacial adhesion, frost resistance, and water retention, were characterized.
  • A wireless sensor system utilizing the PCEL5.0%-based i-skin was constructed for physiological activity and sign language detection, transmitting data to a smartphone via Bluetooth.

Main Results:

  • The PCEL5.0% organohydrogel exhibited excellent ionic conductivity (1.61 S m⁻¹), mechanical properties (70.38 kPa tensile strength, 537.84% elongation), and interfacial adhesion (1.06 kPa to pig skin).
  • The material demonstrated remarkable frost resistance (-50.4 °C), good water retention (67.1% at 22% RH), and remoldability.
  • The PCEL5.0%-based i-skin showed high sensitivity (GF = 1.38), fast response (348 ms), and precision at low temperatures (-25 °C).
  • A wireless sensor system successfully transmitted physiological data and sign language movements to a smartphone.

Conclusions:

  • The developed PCEL5.0% organohydrogel overcomes limitations of traditional hydrogels, offering superior performance for flexible electronics.
  • The organohydrogel i-skin demonstrates significant potential for applications in physiological activity detection, human-computer interaction, and rehabilitation medicine.
  • This work paves the way for more robust and versatile wearable electronic devices.