查找使用阿拉丁产品的科研文献

A Smart Electrolyte-Replenishing Semi-Dry Electrode Based on Temperature-Responsive Hydrogel for Sustainable Electrophysiological Signal Acquisition

Yiming Cai,Fushuai Wang,Lang Yang,Lin Chen,Jialei Ying,Zhenzhong Liu,Guozheng Wang,Chunxin Ma,Jun Liu

Semi-dry electrodes combine the advantages of conventional wet and dry electrodes for wearable devices of electrophysiological signal monitoring, but still severely difficult provide sustainable signal acquisition with low impedance. Herein, this study has developed a new semi-dry electrode, which can achieve smart electrolyte-replenishment for long-time stable and highly comfortable electrophysiological signal acquisition. Through combining the Ag nanoparticle-loaded sponge (ANLS) with the Poly(N-isopropylacrylamide) (PNIPAM)/polyvinyl alcohol (PVA) hydrogel (PPH), the heterogenous interpenetrating network (H-IPN) conductive sensing layer (ANLS-PPH) can be obtained, which can be integrated with outer protective polydimethylsiloxane (PDMS) layer and Ag/AgCl connection central layer together to fabricate the as-prepared 3-layer semi-dry electrode. Most importantly, PPH enables smart electrolyte replenishment triggered by body temperature. This controlled, external force-free release of electrolytes ensures optimal user comfort while significantly lowering the scalp-electrode impedance to 8-18 kΩ. Secondly, owing to the outer PDMS layer, this semi-dry electrode can retain water without it evaporating into the air, thereby maintaining a low contact impedance for at least 6 hours. Last but not least, the H-IPN structure endows this semi-dry electrode with highly-enhanced mechanical performance (258.5 kPa of tensile strength) and provides stability of the electrode structure during signal acquisition. Thus, this semi-dry electrode can stably acquire electroencephalogram (EEG) and electrocardiogram (ECG) electrophysiological signals for a long time, exhibiting a high degree of consistency with conventional wet electrodes (97.9% of spectral correlation). This study provides a smart electrolyte-replenishing semi-dry electrode for sustainable electrophysiological signal acquisition, inspiring new strategies in wearable electrophysiological devices.