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Highly conductive graphene/carbon black screen printing inks for flexible electronics
Lixin Liu1, Zhigang Shen2, Xiaojing Zhang2
1School of Materials Science and Engineering, Beihang University, Beijing 100191, China; Beijing Key Lab. for Powder Technology Research and Development, Beihang University, Beijing 100191, China.
Journal of Colloid and Interface Science
|August 20, 2020
Summary
Researchers developed a novel graphene-based conductive ink for flexible electronics. This ink, using jet-cavitated graphene and carbon black, achieves high conductivity and printability for large-scale Roll-to-Roll applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electrical Engineering
Background:
- Flexible electronics require advanced conductive nanomaterials for industrial-scale production.
- Graphene is a promising material for conductive inks, but challenges remain in achieving high concentration, conductivity, and stability from powders.
- Improving post-treatment processes for printed graphene patterns is essential for device performance.
Purpose of the Study:
- To develop a novel graphene-based screen printing conductive ink for flexible electronics.
- To enhance the conductivity, printability, and mechanical properties of graphene conductive inks.
- To enable large-scale, cost-effective production of printed flexible electronic devices.
Main Methods:
- Utilized liquid-exfoliated graphene powders produced by jet cavitation and carbon black as conductive fillers.
- Formulated inks with a specific graphene flake morphology and 15% carbon black content.
- Implemented a novel post-treatment process involving heating-compression rolling-heating.
Main Results:
- Achieved printability for lines as narrow as 90 μm.
- Obtained printed pattern electrical conductivity of 2.15 × 10^4 S/m at 7 μm thickness.
- Demonstrated outstanding mechanical properties and compatibility with various substrates for Roll-to-Roll processing.
Conclusions:
- The novel graphene-carbon black conductive ink offers a viable solution for high-efficiency, low-cost, large-scale production of printed flexible electronics.
- The developed ink and post-treatment process are suitable for industrial applications and Roll-to-Roll manufacturing.
- This work advances the development of advanced materials for the next generation of electronic devices.
