서강대학교

초록 (요약문)

Forming a flexible electrode is useful in the field of wearable electronics. One of the most effective ways to form flexible electrode is wrinkling patterns on the elastomeric substrate to minimize the effect of mechanical strain. However, most of wrinkled electrodes need pre-stretching or thermal expansion which are complex to fabricate. These methods also make wrinkles on the whole substrate, not the desired part. Here, we report new method to fabricate wrinkled electrode on the local part, direct printing. It made wrinkles on the elastomer surface by solventinduced spontaneous swelling. We discovered that triethyleneglycol monoethyl ether (TGME) plays an important role to last wrinkles permanently on the PDMS surface. Direct printing used TGME-based ink and PDMS as substrate to make wrinkled electrode. Wrinkled electrodes showed higher resistance to the tensile bending compared to the non-wrinkled electrodes. The durability came from enlarged surface of aligned wrinkles. In addition, we applied this wrinkle system to the electrochemical sensor (ECS). ECS detects physiological parameters to monitor body condition. It is useful when it can detect glucose or lactate attached right on the body to monitor without sample collection. We designed and printed wrinkle-based ECS and showed its printability and repeatability via cyclic voltammetry (CV). It maintained stable CV curve under mechanical bending which means it has possibility for flexible wearable sensor. With this simplified method, direct printing, we opened a new way to fabricate flexible electrode easily. The wrinkled electrodes are expected to be used as variety of application such as wearable sensor or flexible electronics.