Wearable sweat sensors have garnered substantial attention owing to their actual significance in the noninvasive and real-time monitoring of health conditions. However, it remains significantly challenging to efficiently construct a high-sensitivity sweat sensor with stable long-term sensing capability. Herein, we report an effective methodology based on wet-spinning/acid-etching technology to construct a porous core–shell yarn-based wearable electrochemical sensor. This strategy increases the inductive surface area of the ion concentration and facilitates signal transmission. As a result, the sensor demonstrates high sensitivity for monitoring K⁺ and pH in sweat (54.89 mV/dec for K⁺ and 40.2 mV/pH for pH). Furthermore, the sensors exhibit outstanding sensing stability, good long-term stability (>16 h), and satisfactory bending resistance (>1000 cycles). More importantly, the sensing yarns could be prepared at speeds of up to 500 m/h with a continuous preparation strategy, which enabled mass fabrication of the electrochemical sensor. Electrochemical sensors could serve as sweat-sensing systems for real-time health monitoring and hold great potential for the commercialization of health-detection technology.

中文翻译：

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可穿戴电化学传感器中的多孔芯壳纱，用于实时汗液监测


可穿戴汗液传感器因其在无创和实时监测健康状况方面的实际意义而受到广泛关注。然而，要有效地构建具有稳定长期传感能力的高灵敏度汗液传感器仍然极具挑战性。在此，我们报道了一种基于湿法纺丝/酸蚀技术构建多孔芯壳纱基可穿戴电化学传感器的有效方法。这种策略增加了离子浓度的感应表面积并促进了信号传输。因此，该传感器在监测汗液中的 K⁺ 和 pH 值方面表现出高灵敏度（K⁺ 为 54.89 mV/dec，pH 值为 40.2 mV/pH）。此外，传感器表现出出色的传感稳定性、良好的长期稳定性 （>16 h） 和令人满意的抗弯曲性 （>1000 次循环）。更重要的是，通过连续制备策略，可以以高达 500 m/h 的速度制备传感纱线，从而能够大规模制造电化学传感器。电化学传感器可以用作实时健康监测的汗液传感系统，并在健康检测技术的商业化方面具有巨大潜力。