Ultra-Soft Transducers with Organic Electronics for Skin-Sensor Systems

Extremely soft and lightweight electronic devices can acquire biological signals such as pressures [1,2], blood pressure [2], electrocardiogram [3] on the skin, cell sheets, and textiles with minimized uncomfortableness when attached and without sensory interference. Combining such ultra-soft sensory systems with an ultra-lightweight or wireless power supply makes it possible to realize self-powered transducers [5,6]. We will report recent progress of the ultra-flexible organic photonic system and the nanomesh based skin sensors. To realize the air-stable organic photonic system, we developed the ultra-flexible organic light emitting diode with inverted structure. The lifetime of the OLED is longer than 1 week. In addition, we realized the self-adhesive nano sheet which was reinforced by polymer nanofiber. We succeed to monitor the ECG signal for a one week by attaching the nano-sheet electrode. [1] S. Lee et al., Science, 370, 966-970, (2020). [2] J. Zhong et al., Adv. Mater. 34, 2107758 (2022). [3] T. Yokota et al., Adv. Mater. Technol. Doi: 10.1002/admt.202200454 [4] S. Lee et al., Nat. Nanotechnol. 14, 156-1160 (2019). [5] S. Park et al., Nature 561, 516-521 (2018).<br/>[6] H. Jinno et al., Nat. Commun. 12, 2234 (2021).