In Situ 3D Printing of Conformal Bioflexible Electronics via Annealing PEDOT:PSS/PVA Composite Bio-Ink

Area of Science:

• Bioelectronics
• Materials Science
• Biomanufacturing

Background:

• Flexible sensors are crucial for personalized health monitoring but face challenges in conformal integration, biomechanical compatibility, and biocompatibility.
• Existing devices struggle to achieve seamless integration with biological surfaces.

Purpose of the Study:

• To present an in situ 3D biomanufacturing strategy for fabricating functional bioelectronic interfaces directly onto human skin.
• To utilize a novel annealing PEDOT:PSS/PVA composite bio-ink for on-body sensor fabrication.

Main Methods:

• Development of a novel annealing PEDOT:PSS/PVA composite material.
• Specialized processing including freeze-drying and thermal annealing.
• Formulation into a Direct Ink Writing (DIW) ink with excellent printability.

Main Results:

• The composite material exhibits favorable electrical conductivity (6 S/m dry, 2 S/m swollen) and high mechanical stretchability (170% strain).
• The fabricated sensors demonstrated good adhesion to biological interfaces and high-fidelity printability.
• On-body devices showed strain-sensitive, repeatable responses during joint movement, transducing strain into electrical signals.

Conclusions:

• The study validates the feasibility of DIW biomanufacturing with the novel material for direct on-body sensor fabrication.
• This approach offers new material and manufacturing paradigms for customized, integrated bioelectronic devices.
• The technology holds promise for advanced personalized health monitoring and human-machine interaction.