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Modulus-tunable multifunctional hydrogel ink with nanofillers for 3D-Printed soft electronics.

Minkyong Kang1, Jae Park1, Soo A Kim1

  • 1Department of Electrical and Electronic Engineering, Yonsei University, Seoul, 03722, Republic of Korea.

Biosensors & Bioelectronics
|April 4, 2024
PubMed
Summary

Researchers developed a 3D-printable, modulus-tunable hydrogel for soft electronics. This advanced hydrogel offers improved mechanical properties and electrical conductivity for seamless tissue integration and wearable sensors.

Keywords:
3D-printableConformal-interfacingFunctional-nanofillerHydrogelModulus-tunable

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Soft Robotics

Background:

  • Mechanical mismatch between soft electronics and biological tissues hinders conformal interfacing.
  • Existing soft hydrogels for bioelectronics have limitations in electrical and mechanical performance.

Purpose of the Study:

  • To develop a 3D-printable, modulus-tunable hydrogel with enhanced functionalities for bioelectronic applications.
  • To address the challenges of seamless integration and conformal contact of soft electronics with tissue surfaces.

Main Methods:

  • Development of a cross-linked double network hydrogel structure.
  • Incorporation of functional fillers like XLG or functionalized carbon nanotubes (fCNT) for tunable mechanics and conductivity.
  • 3D printing utilizing rheological properties for customized bioelectronic designs.

Main Results:

  • Achieved tunable mechanics (Young's modulus: 10-300 kPa) and electrical conductivity (~20 S/m).
  • Demonstrated superior properties including stretchability (~1000% strain), self-healing (within 5 min), high toughness (400-731 kJ/m³), viscoelasticity, tissue conformability, and biocompatibility.
  • Successfully fabricated ring-shaped strain sensors for wearable applications.

Conclusions:

  • The developed hydrogel overcomes limitations of existing materials for soft bioelectronics.
  • The tunable and printable nature of the hydrogel enables customized, high-performance wearable sensors.
  • This material facilitates seamless integration of electronics with biological tissues for advanced monitoring.