Wen Shuai, Zhang Ruipeng, Zhao Yahui, Xu Xinyue, Ji Shaobo
Institute of Functional Nano & Soft Materials (FUNSOM), College of Nano Science and Technology (CNST), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China.
Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
ACS Omega. 2025 Jan 16;10(3):3190-3198. doi: 10.1021/acsomega.4c10830. eCollection 2025 Jan 28.
Electrophysiological sensors (electrodes) are used to collect complex electrophysiological signals, providing extensive information about the body's condition. Reliable signal acquisition necessitates stable skin-electrode interfaces to prevent adverse effects arising from interface variations. Although the incorporation of conductive adhesive layers can improve the stability of these interfaces, in array electrodes, the layer may also cause short circuits and signal crosstalk. Here, we propose a general strategy for patterning the adhesive layer of array electrodes based on electrochemically grafted adhesive polymers (EGAPs). Utilizing the conductivity differences between the sensing sites and the substrate material of flexible electrodes, spatial selective loading of adhesive and ionically conductive polymers can be achieved through in situ electrochemical reactions, thus realizing spontaneous patterning. This EGAP-based method allows for a rapid and selective electrode surface modification in just two steps. Furthermore, array electrodes with EGAP acquired stable electrophysiological signals while improving the stability of the skin-electrode interface and the quality of signal collected and effectively avoided signal crosstalk between arrayed sensing sites.
电生理传感器（电极）用于收集复杂的电生理信号，提供有关身体状况的广泛信息。可靠的信号采集需要稳定的皮肤-电极界面，以防止因界面变化而产生的不利影响。尽管加入导电粘合剂层可以提高这些界面的稳定性，但在阵列电极中，该层也可能导致短路和信号串扰。在此，我们提出了一种基于电化学接枝粘合剂聚合物（EGAPs）对阵列电极粘合剂层进行图案化的通用策略。利用柔性电极传感部位与基底材料之间的电导率差异，通过原位电化学反应可实现粘合剂和离子导电聚合物的空间选择性负载，从而实现自发图案化。这种基于EGAP的方法只需两步就能实现快速且选择性的电极表面改性。此外，带有EGAP的阵列电极在提高皮肤-电极界面稳定性和采集信号质量的同时，获得了稳定的电生理信号，并有效避免了阵列传感部位之间的信号串扰。
