Skin-like electronics on human skin can be operated in real-time and in a non-invasive manner for ECG biosensors. Conductive hydrogels possessing high electrical conductivity, soft and moisturizing properties, have great potential in this field. Herein, we propose to use polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) as the skeleton of the hydrogel, the polyethylene-3,4-dioxythiophene:sodium polystyrene sulfonate (PEDOT:PSS) mixture is evenly dispersed among it to form a continuous and interconnected conductive pathway. The prepared conductive hydrogels have an electrical conductivity of 75 S m⁻¹ with high water content (above 80 %) and mechanical properties, leading to sufficiently soft and moisturizing, and can take place of traditionally high-cost Ag/AgCl electrodes. Importantly, these conductive hydrogels are similar to human tissues and can form a naturally seamless interface between the human body and the ECG biosensor device, promoting the high response of obtained electronic signals with low impedance. Therefore, these functionalized conductive hydrogels show excellent application prospects in ECG biosensors.

人体皮肤上的类皮肤电子设备可以实时和非侵入性地操作 ECG 生物传感器。导电水凝胶具有高导电性、柔软性和保湿性，在该领域具有巨大潜力。在此，我们建议使用聚乙烯醇（PVA）和羧甲基纤维素（CMC）作为水凝胶的骨架，将聚乙烯-3,4-二氧噻吩：聚苯乙烯磺酸钠（PEDOT：PSS）混合物均匀分散在其中形成连续和互连的导电通路。制备的导电水凝胶的电导率为 75 S m ^-1具有高含水量（高于 80%）和机械性能，导致足够柔软和保湿，并且可以替代传统的高成本 Ag/AgCl 电极。重要的是，这些导电水凝胶类似于人体组织，可以在人体和心电生物传感器装置之间形成自然无缝的界面，促进获得的低阻抗电子信号的高响应。因此，这些功能化的导电水凝胶在心电生物传感器中显示出良好的应用前景。