3D Printing of Self-Wiring Conductive Ink with High Stretchability and Stackability for Customized Wearable Devices

In Seon Yoon, Youngsu Oh, Sun Hong Kim, Junhee Choi, Yooji Hwang, Cheol Hwee Park, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The progress in 3D printing research has led to significant developments ranging from customized printing to rapid prototyping. However, the 3D printing of electrodes, especially stretchable electrodes for the fabrication of 3D printable electronic devices, is challenging due to the inherent weakness with respect to the printing material. A novel preparation method is reported for a 3D printable conductive ink with a self-wiring effect during heat treatment, which pushes the silicone rubber outward and results in the accumulation of the conductors within the wire. This effect results in the formation of a polymer shell around the conductor, thus yielding conductors with larger stretchability and soft passivation characteristics. The conductive ink is prepared via the following steps: i) mixing of conductive filler, silicone rubbers, and solvent; followed by ii) soft heat treatment for soft curing and solvent evaporation. Furthermore, a capacitive sensor is fabricated using this dielectric polymer layer. As a demonstration, a mouse controller is fabricated using a capacitive sensor array prepared using the conductors developed in this study.

Original languageEnglish
Article number1900363
JournalAdvanced Materials Technologies
Volume4
Issue number9
DOIs
Publication statusPublished - 2019 Sept 1

Bibliographical note

Funding Information:
I.S.Y. and Y.O. contributed equally to this work. I.S.Y. and Y.O. developed the idea and designed the experiment. I.S.Y., Y.O., and S.H.K. conducted the experiments and investigated the obtained results. I.S.Y., J.C., Y.H., C.H.P., and B.-K.J. wrote the text of the paper. This work was partly supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (no. 2019R1A2B5B01070286), and the Brain Korea 21 Plus Project in 2019.

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • 3D printing
  • Ag flake
  • capacitive sensor
  • stretchable conductors
  • wiring

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering

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