Kim, Seungwan Kang, Joohyuk Lee, Injun Jang, Jinhyeong Park, Chan Beum Lee, Wonryung Bae, Byeong-soo 2024-01-19T09:04:03Z 2024-01-19T09:04:03Z 2023-08-17 2023-07 2397-4621 https://pubs.kist.re.kr/handle/201004/113500 Ecoflex is widely used in bioelectronics due to its outstanding properties of low modulus and large stretchability. For its use as an encapsulation layer in multi-channel wearable devices, a patterning procedure is essential. However, conventional patterning strategies for Ecoflex, such as soft lithography, punching, and laser ablation, lack sufficient quality and process compatibility. To address this, we propose a process-compatible method of patterning Ecoflex by developing Photo-patternable Ecoflex (PPE). The PPE layer, used as an encapsulation layer, effectively dissipates strain energy at homogeneous interfaces, resulting in a 50% increase in electrical conductance under 250% strain. Using PPE, we fabricated intrinsically stretchable multi-sensors that monitor bio-signals like glucose, lactate, pH, and humidity in sweat. These sensors maintain durable sensitivity under strain up to 50% and for 1000 cycles at 20% strain. Finally, we mounted these stretchable multi-chemical sensors on an arm to monitor glucose and lactate levels in sweat. English Nature Publishing Group An intrinsically stretchable multi-biochemical sensor for sweat analysis using photo-patternable ecoflex Article 10.1038/s41528-023-00268-x 1 npj Flexible Electronics, v.7, no.1 npj Flexible Electronics 7 1 Y scie scopus 001034763200001 2-s2.0-85165595430 Engineering, Electrical & Electronic Materials Science, Multidisciplinary Engineering Materials Science Article SKIN ELECTRONICS MECHANICS