A versatile PDMS submicrobead/graphene oxide nanocomposite ink for the direct ink writing of wearable micron-scale tactile sensors

Shi, Ge and Lowe, Sean E. and Teo, Adrian J.T. and Dinh, Toan K. ORCID: https://orcid.org/0000-0002-7489-9640 and Tan, Say Hwa and Qin, Jiadong and Zhang, Yubai and Zhong, Yu Lin and Zhao, Huijun (2019) A versatile PDMS submicrobead/graphene oxide nanocomposite ink for the direct ink writing of wearable micron-scale tactile sensors. Applied Materials Today, 16. pp. 482-492. ISSN 2352-9407


Abstract

Although direct ink writing (DIW) is a versatile 3D printing technique, progress in DIW has been con-strained by the stringent rheological requirements for printable conductive nanocomposites, particularlyat smaller length scales. In this work, we overcome these challenges using an aqueous nanocompositeink with polydimethylsiloxane (PDMS) submicrobeads and an electrochemically derived graphene oxide(EGO) nanofiller. This nanocomposite ink possesses a thixotropic, self-supporting viscoelasticity. It can beeasily extruded through very small nozzle openings (as small as 50 �m) allowing for the highest resolutionPDMS DIW reported to date. With a mild thermal annealing, the DIW-printed device exhibits low resis-tivity (1660 �·cm) at a low percolation threshold of EGO (0.83 vol.%) owing to the unique nanocompositestructure of graphene-wrapped elastomeric beads. The nanocomposite ink was used to print wearable,macro-scale strain sensing patches, as well as remarkably small, micron-scale pressure sensors. Thelarge-scale strain sensors have excellent performance over a large working range (up to 40% strain), withhigh gauge factor (20.3) and fast responsivity (83 ms), while the micron-scale pressure sensors demon-strated high pressure sensitivity (0.31 kPa−1) and operating range (0.248–500 kPa). Ultrahigh resolution,multi-material layer-by-layer deposition allows the engineering of microscale features into the devices,features which can be used to tune the piezoresistive mechanism and degree of piezoresistivity


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Date Deposited: 17 Jul 2020 00:27
Last Modified: 20 Jul 2020 03:27
Uncontrolled Keywords: PDMS; Graphene oxide; Nanocomposite; Direct ink writing; Tactile sensor
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.1016/j.apmt.2019.06.016
URI: http://eprints.usq.edu.au/id/eprint/38148

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