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A Simple and Scalable Fabrication Method for Organic Electronic Devices on Textiles

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Multifunctional Nanocomposite Yield-Stress Fluids for Printable and Stretchable Electronics.

Qianying Lu^1,2, Yuping Sun^1,2, Ming Wu³

¹College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructure, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210023, China.

|May 9, 2024

Summary

This study introduces novel yield-stress fluids for advanced stretchable electronics. These printable inks transition from solid to liquid states, enabling highly deformable and durable electronic devices like smart gloves.

Keywords:

liquid metal nanocomposites printable electronics stretchable electronics yield-stress fluids

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Area of Science:

Materials Science
Nanotechnology
Electronics Engineering

Background:

Stretchable electronics require compliant materials, but existing solids, gels, and liquids have limitations in deformability, durability, or device complexity.
Developing materials that balance mechanical robustness with extreme deformability is essential for next-generation wearable devices.

Purpose of the Study:

To present multifunctional yield-stress fluids as printable ink materials for constructing advanced stretchable electronic devices.
To demonstrate the potential of these inks in creating high-performance sensors and integrated systems.

Main Methods:

Synthesized ionic nanocomposite inks using silica nanoparticles and ion liquids.
Developed electrical nanocomposite inks incorporating gallium oxide nanoflakes from liquid metal oxidation.
Utilized printing techniques on elastomer substrates to fabricate electronic components.

Main Results:

The yield-stress fluids exhibit a solid state for easy handling and encapsulation, transitioning to a liquid state under stretching for ultrahigh deformability.
Ionic inks enabled the creation of highly stretchable strain sensors and sensitive temperature sensors (7% °C^-1).
Integrated sensors and printed interconnects formed smart gloves capable of bimodal temperature and gesture detection.

Conclusions:

Multifunctional yield-stress fluids offer a promising solution for stretchable electronics by combining solid-state processability with liquid-state deformability.
These materials pave the way for robust, highly stretchable, and complex electronic systems, including wearable devices.
The developed inks represent a significant advancement in printable materials for flexible and wearable electronic applications.