Mihara Sho, Lee Hui-Lin, Takeoka Shinji
Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, 162-8480 Japan.
Waseda Research Institute for Science and Engineering, Waseda University, Tokyo, 169-8555 Japan.
MRS Commun. 2020;10(4):628-635. doi: 10.1557/mrc.2020.72. Epub 2020 Dec 24.
Waterproof bioelectrodes enable long-term biological monitoring and the assessment of performances of athletes in water. Existing gel electrodes change their electrical properties even when covered with a waterproof film. Here, the authors present the poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/poly(styrene-butadiene-styrene) (SBS) bi-layer nanosheet and waterproof film for a comfortable waterproof bioelectrode. PEDOT:PSS/SBS is fully foldable with a conductivity loss of only 5%. This foldable nanosheet electrode provides a reliable electrical connection between the skin and the wire. The waterproof film-covered bioelectrode enables continuous monitoring of electrocardiograms in water, showing a signal-to-noise ratio of 21.5 dB for the R wave and 17.5 dB for the T wave, comparable to atmospheric measurements, and sensing a change in heart rate from 79 to 131 bpm during bathing.
防水生物电极能够实现长期生物监测，并评估运动员在水中的表现。现有的凝胶电极即使覆盖有防水薄膜，其电学性质仍会发生变化。在此，作者展示了用于舒适型防水生物电极的聚（3,4-亚乙二氧基噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）/聚（苯乙烯-丁二烯-苯乙烯）（SBS）双层纳米片和防水薄膜。PEDOT:PSS/SBS完全可折叠，电导率损失仅为5%。这种可折叠的纳米片电极在皮肤与导线之间提供了可靠的电连接。覆盖有防水薄膜的生物电极能够在水中连续监测心电图，R波的信噪比为21.5 dB，T波的信噪比为17.5 dB，与大气环境下的测量结果相当，并且在洗澡过程中能够检测到心率从79次/分钟变化到131次/分钟。
