Abstract
Electronic devices with stretchability can apply to various areas because stretchability enables bending and stretching while in use. However, the conventional electrodes made of hard materials are not suitable for bending and stretching. Therefore, electronic devices consisting of stretchable electrodes enclosed in elastomer have been developed. We fabricated stretchable electrodes using Ga-In-Sn alloy (low melting point eutectic alloy consisting of 68.5 % Gallium, 21.5 % Indium, and 10 % Tin) enclosed in PDMS sheets. Purposes of this study is researching electrical characteristics of Ga-In-Sn alloy stretchable electrodes under stretching to demonstrate efficiency of Ga-In-Sn alloy stretchable electrodes. In this paper, we conducted the single tensile tests and the cyclic tests with Ga-In-Sn alloy stretchable electrodes and derived theoretical equation with contact resistance. In the tensile tests, it was found that Ga-In-Sn alloy stretchable electrodes fail at 50〜60 % strain due to leaking Ga-In-Sn alloy. In the cyclic tests, hysteresis was not observed and electrical resistance change responded to strain without delay. We found experimental value and theoretical value are closer, by deriving theoretical equation with contact resistance.
