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.
Bibliographical noteFunding 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.
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- 3D printing
- Ag flake
- capacitive sensor
- stretchable conductors
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Industrial and Manufacturing Engineering