Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.313
Publication date: 7th February 2022
Recently emerged on-skin electronics with applications in human-machine interfaces and on-body healthy monitoring call for the development of high-performance skin-like electrodes and semiconducting polymers. The development of waterproof and breathable membranes that can provide a high level of protection for human skins and a comfortable contact between electronics and human skin are the pressing demands for on-skin electronics. However, major challenges remain, such as the limited mechanical durability and permeability of gas and liquid, hindering long-term stability and reusability. Therefore, it is highly desirable to develop a new type of skin-breathable and waterproof on-skin electronics. Herein, we report a fibrous electrolyte containing polymer matrix and ionic liquid by electrospinning method, which is highly robust, breathable, waterproof, and conformal with human skin, after bonding a parylene layer between fibers. The improvement of electrical conductivity of both electrodes and organic semiconducting polymer, and ionic conductivity of fibrous electrolyte were demonstrated. Serving as fibrous substrate and electrolyte of organic electrochemical transistors (OECTs), a high transconductance of ~0.8 mS, fast response time of 60 ms and stability over pulsing and time (~1000 cycles and 30 days) were achieved. The waterproof and breathable capabilities of fibrous OECTs enable comfortable contact after attaching to human skin, which can also reduce the interfacial impedance to achieve local amplification of the high-quality electrocardiography signals (SNR of 21.7 dB) even in skin squeezed state or after one week. These results indicated that our fibrous OECTs have huge potential for versatile on-skin electronics such as non-invasive medical monitoring, soft sensors, and textile electronics.
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