Performance Research of Liquid Metal Flexible Circuits Based on 3D Printing
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
| Abstract: | To achieve rapid and efficient manufacturing of reliable flexible circuits, this paper analyzes the wettability of Galinstan liquid metal with traditional electronic component pins and proposes a flexible circuit fabrication scheme based on a direct molding method using 3D printing with DLP technology. Stretch resistors and analog switch circuits fabricated by this method were tested under stretching and twisting conditions. The results show that for liquid metals exposed to air and wrapped with an oxide film, it is difficult to wet the pins of electronic components. By using a NaOH solution to encapsulate Galinstan, the rapid wettability of the pins of electronic components can be achieved, which can be completed in 2 seconds; The contact angle after infiltration has been increased from 131.5° to 19.7° and can be repeatedly wetted, confirming that Galinstan is a flexible circuit conductor material compatible with traditional electronic components. Additionally, the stretching curve of the flexible circuits made using the method proposed in this paper can be with a first-order function; It still has a stable resistance value, after 1000 stretching release cycles; The analog switch circuit can still working under 50% tension and 180 ° torsion. This indicates that the circuits good linearity, stability, and repeatability, effectively enabling the fabrication of flexible sensing elements and circuits, and providing a new approach for small-scale production of personalized electronic circuits. |
| Keywords: | Liquid Metal, Flexible Circuits, 3D Printing, Wettability, Flexible Resin |
| DOI: | 10.57237/j.mater.2023.02.001 |
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Received: 28 April 2023
Accepted: 20 June 2023
Published Online: 29 June 2023
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