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Planar and Three-Dimensional Printing of Conductive Inks
Published on: December 9, 2011
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All 3D Printed Soft Integrated Conductors.
Peiru Liu1, Ligang Yao1, Wei Liu1
1School of Mechanical Engineering and Automation, Fuzhou University, Minhou County, Fuzhou, Fujian 350108, China.
ACS Applied Materials & Interfaces
|December 2, 2025
Summary
Researchers developed a novel conductive hydrogel ink using PEDOT:PSS and PAAm for 3D printing. This soft, skin-like material enables high-resolution circuits with excellent conductivity and flexibility for advanced human-machine interfaces.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomedical Engineering
Background:
- Soft integrated circuits mimic skin properties, offering potential for human-machine interfaces and biomedical devices.
- Current manufacturing methods for flexible circuits are complex, limiting their widespread application and innovation.
Purpose of the Study:
- To develop a novel composite ink for high-resolution 3D printing of soft integrated circuits.
- To create a conductive hydrogel with excellent mechanical properties, conductivity, and stability for advanced electronic applications.
Main Methods:
- A composite ink was formulated using PEDOT:PSS (3,4-ethylenedioxythiophene/styrenesulfonate) and PAAm (polyacrylamide).
- The ink was processed using high-resolution direct ink writing (DIW) 3D printing.
- A cross-linking process transformed the ink into a conductive hydrogel, followed by post-treatment.
Main Results:
- The 3D-printed hydrogel achieved conductivity of 62 S/m (gel state) and 311 S/m (dry gel state).
- The material demonstrated a significant strain capacity of 210% and maintained high stability in water.
- Wireless transmission of electrical signals was achieved through printed miniature 3D circuits.
Conclusions:
- The developed conductive hydrogel ink offers a promising platform for fabricating high-performance soft integrated circuits via 3D printing.
- Its biocompatibility and robust properties suggest significant potential for implantable electronic engineering and advanced sensing applications.
