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Multi-functional 3D printed hydrogel electrodes for brain-computer interfaces and wearable sensing.

Xinyu Wu1, Haorui Ge1, Wei Zhao2

  • 1School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.

Journal of Colloid and Interface Science
|November 11, 2025
PubMed
Summary
This summary is machine-generated.

A new 3D printed hydrogel composite of polyvinyl alcohol (PVA)/κ-carrageenan (κ-CA)/carbon nanotubes (CNTs) shows promise for flexible electrodes. This material offers excellent mechanical and sensing capabilities for brain-computer interfaces (BCIs) and wearable strain sensors.

Keywords:
3D printingBrain-computer interfacesConductive hydrogelFlexible strain sensor

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Neuroscience

Background:

  • Flexible electrodes are crucial for advanced bioelectronic devices like brain-computer interfaces (BCIs) and wearable sensors.
  • Existing electrode materials often face limitations in mechanical flexibility, biocompatibility, or signal transduction.
  • There is a need for novel materials that can integrate high performance with user comfort and adaptability.

Purpose of the Study:

  • To develop a 3D printable hydrogel composite for flexible electrodes.
  • To evaluate the mechanical, electrical, and sensing properties of the developed hydrogel.
  • To assess the performance of the hydrogel in brain-computer interface (BCI) applications and as a wearable strain sensor.

Main Methods:

  • Fabrication of a polyvinyl alcohol (PVA)/κ-carrageenan (κ-CA)/carbon nanotubes (CNTs) hydrogel composite using 3D printing.
  • Characterization of mechanical properties including tensile strength, elastic modulus, and maximum tensile strain.
  • Evaluation of BCI performance through scalp contact impedance and signal quality measurements.
  • Assessment of strain sensing capabilities, including gauge factor and self-recovery.
  • Testing of decoding accuracy and information transfer rate (ITR) for BCI applications.

Main Results:

  • The PVA/κ-CA/CNTs (PCC) hydrogel composite demonstrated excellent mechanical properties (tensile strength: 633 kPa, elastic modulus: 243 kPa, tensile strain: 283%).
  • PCC hydrogel electrodes achieved low scalp contact impedance (76.08 kΩ) and high signal quality comparable to wet electrodes.
  • BCI tests showed high decoding accuracy (78.2%) and information transfer rate (71.3 bits/min).
  • The hydrogel exhibited superior strain sensing performance (gauge factor: 2.7) and fast self-recovery.

Conclusions:

  • The 3D printed PCC hydrogel composite is a highly promising material for flexible electrodes in BCIs and wearable sensors.
  • The material's combination of mechanical robustness, electrical conductivity, and sensing capabilities offers a significant advancement.
  • This work presents a novel approach for developing next-generation flexible bioelectronic devices through material and structural design.