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Development of environmentally friendly inkjet printable carbon nanotube‐based conductive ink for flexible sensors: effects of concentration and functionalization

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Abstract

The fabrication of environmentally friendly printed flexible sensors is still an emerging technology, but with vast potential applications. Among the available printing techniques, inkjet printing is considered as a promising technique for flexible electronics because it enables high volume and versatile manufacturing, at low environmental impact. This study demonstrates a simple and facile method of preparing an environmentally benign water-based conductive ink, by dispersing functionalized and non-functionalized multi-walled carbon nanotubes (MWCNTs) in aqueous solution with the help of a biopolymer surfactant. The concentration of CNTs in the ink formulation was varied from 0.25 to 0.75 wt%, and additives such as triton-x 100, polypropylene glycol, and defoamer were added to achieve desirable ink properties. Inkjet printable ink was produced, and it was observed that the conductivity of the printed pattern is dependent on the printing pass. In addition, it was found that as the number of printing layer increases, there is higher synergy between concentration and number of printing pass in F-MWCNTs printed ink to produce higher electrical conductivity, compared to MWCNTs printed ink. Generally, the findings of this study could potentially open opportunities for global economic growth through the applications of printed, low cost and environmentally friendly flexible sensors.

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Acknowledgements

The authors would like to thank the Universiti Sains Malaysia for their contribution to this project through Fundamental Research Grant (MRSA: Grant No.: 6071385).

Funding

The fund used for this study was provided by Universiti Sains Malaysia through Fundamental Research Grant (MRSA: Grant No.: 6071385).

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Authors and Affiliations

  1. School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300, Nibong Tebal, Pulau Pinang, Malaysia

    John O. Akindoyo, Nurul Hidayah Ismail & M. Mariatti

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  1. John O. Akindoyo
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  2. Nurul Hidayah Ismail
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  3. M. Mariatti
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Correspondence to M. Mariatti.

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Akindoyo, J.O., Ismail, N.H. & Mariatti, M. Development of environmentally friendly inkjet printable carbon nanotube‐based conductive ink for flexible sensors: effects of concentration and functionalization. J Mater Sci: Mater Electron 32, 12648–12660 (2021). https://doi.org/10.1007/s10854-021-05900-y

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  • DOI: https://doi.org/10.1007/s10854-021-05900-y

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