Direct Patterning of Highly Conductive PEDOT:PSS/Ionic Liquid Hydrogel via Microreactive Inkjet Printing.

Mei Ying Teo, Narrendar RaviChandran, Nara Kim, Seyoung Kee, Logan Stuart, Kean C Aw, Jonathan Stringer

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


The gelation of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has gained popularity for its potential applications in three dimensions, while possessing tissue-like mechanical properties, high conductivity, and biocompatibility. However, the fabrication of arbitrary structures, especially via inkjet printing, is challenging because of the inherent gel formation. Here, microreactive inkjet printing (MRIJP) is utilized to pattern various 2D and 3D structures of PEDOT:PSS/IL hydrogel by in-air coalescence of PEDOT:PSS and ionic liquid (IL). By controlling the in-air position and Marangoni-driven encapsulation, single droplets of the PEDOT:PSS/IL hydrogel as small as a diameter of ≈260 μm are fabricated within ≈600 μs. Notably, this MRIJP-based PEDOT:PSS/IL has potential for freeform patterning while maintaining identical performance to those fabricated by the conventional spin-coating method. Through controlled deposition achieved via MRIJP, PEDOT:PSS/IL can be transformed into different 3D structures without the need for molding, potentially leading to substantial progress in next-generation bioelectronics devices.
Original languageEnglish (US)
Pages (from-to)37069-37076
Number of pages8
JournalACS Applied Materials & Interfaces
Issue number40
StatePublished - Sep 27 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thank the Microfabrication Laboratory, Polymer Electronics Research Centre (PERC), and Centre for Advanced Composite Materials (CACM) at the University of Auckland for their assistance with the measurements. The authors also acknowledge the help from Dr. Pooja Yadav for the help with ESR measurements


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