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Title: 100 m min⁻¹ industrial-scale flexographic printing of graphene-incorporated conductive ink
Authors: Macadam, Nasiruddin
Ng, Leonard W. T.
Hu, Guohua
Shi, H. Haotian
Wang, Wenyu
Zhu, Xiaoxi
Ogbeide, Osarenkhoe
Liu, Shouhu
Yang, Zongyin
Howe, Richard C. T.
Jones, Chris
Huang, Shery Yan Yan
Hasan, Tawfique
Keywords: Engineering::Materials
Issue Date: 2022
Source: Macadam, N., Ng, L. W. T., Hu, G., Shi, H. H., Wang, W., Zhu, X., Ogbeide, O., Liu, S., Yang, Z., Howe, R. C. T., Jones, C., Huang, S. Y. Y. & Hasan, T. (2022). 100 m min⁻¹ industrial-scale flexographic printing of graphene-incorporated conductive ink. Advanced Engineering Materials, 24(5), 2101217-.
Journal: Advanced Engineering Materials 
Abstract: Flexographic printing is promising for large-area electronics due to high print-speed and roll-to-roll capability. There have been recent attempts in using graphene as an active pigment in inks, most notably for slower techniques such as inkjet and screen printing. However, formulation of graphene-enhanced inks for high-speed printing and its effect on key metrics have never been investigated. Herein, graphene nanoplatelets (GPs) are incorporated to a conductive flexographic ink without compromising the rheological properties. An industrial scale at 100 m min−1 is printed on paper and polyethylene terephthalate (PET) substrates using a commercial flexographic press, and statistical performance variations are investigated across entire print runs. It is shown that GP-incorporation improves sheet-resistance (Rs) and uniformity, with up to 54% improvement in average Rs and 45% improvement in the standard-deviation on PET. The adhesion on both the substrates improves with GP-incorporation, as verified by tape/crosshatch tests. The durability of GP-enhanced samples is probed with a 1000 cyclic bend-test, with 0.31% average variation in resistance in the flat state on PET between the first and last 100 bends, exhibiting a robust print. The statistically scalable results show that GP-incorporation offers a cost-performance advantage for flexographic printing of large-area conductive patterns without modifications to traditional high-speed graphics printing presses.
ISSN: 1438-1656
DOI: 10.1002/adem.202101217
Schools: School of Materials Science and Engineering 
Rights: © 2021 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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