제목: Bioinspired Electronics: Unconventional Bandpass filter for noise free bioelectronics

내용: Biophysiology detection from current advanced electronics is limited by external signal artifacts (e.g. walking and respiration).[1] Here, we present the viscoelastic gelatin/chitosan hydrogel damper inspired by the viscoelastic cuticular pad in a spider to remove dynamic mechanical noise artifacts selectively under 30 Hz. [2] The hydrogel exhibits frequency-dependent phase transition that results in a rubbery state that damps low-frequency noise and a glassy state that transmits the desired high-frequency signals. Instead of the conventional signal processing, the hydrogel damper served as unconventional pass filter that is able to be integrated with advanced bioelectronics for biophysiology detection even in noisy conditions. Also several methods for band pass filtering for human physiological signals will be discussed. [3, 4] It can dissolve chronic noise problems in the bioelectronics, and shows huge potential for uninterrupted monitoring of devices (i.e., gadgets, medical devices, or prostheses) for patients.

[1] Daeshik Kang et al. Nature 516, 222 (2014)

[2] Byeonghak Park et al. Science 376 (6593) 624-629 (2022)

[3] Chanho Jeong et al. Adv. Mater. 31, 1902689 (2019)

[4] Juwhan Shin et al. npj Flex. Electron. 6, 32 (2022)