Flexible electronics are playing an increasingly important role in human health monitoring and healthcare diagnosis. Strong adhesion on human tissue would be ideal for reducing interface resistance and motion artifacts, but arising problems such as skin irritation, rubefaction, and pain upon device removal have hampered their utility. Here, inspired by the temperature reversibility of hydrogen bonding, a skin-friendly conductive hydrogel with multiple-hydrogen bonds was designed by using biocompatible poly(vinyl alcohol) (PVA), phytic acid (PA), and gelatin (Gel). The obtained PVA/PA/Gel (PPG) hydrogel with temperature-triggered tunable mechanic could reliably adhere to skin and detect electrophysiological signals under a hot compress while be readily removed under a cool compress. Furthermore, the additional advantages of transparency, breathability, and antimicrobial activity of the PPG hydrogel ensure its long-time wearable value on the skin. It is both environmentally friendly and cost saving for the waste PPG hydrogel during production can be recycled based on their reversible physical bonding. The PPG hydrogel sensor is expected to have good application prospects to record electrophysiological signals in human health monitoring.

柔性电子产品在人体健康监测和医疗保健诊断中发挥着越来越重要的作用。对人体组织的强附着力对于减少界面阻力和运动伪影是理想的，但出现的问题，如皮肤刺激、擦伤和设备移除时的疼痛已经阻碍了它们的实用性。在这里，受氢键温度可逆性的启发，使用生物相容性聚乙烯醇 (PVA)、植酸 (PA) 和明胶 (Gel) 设计了一种具有多重氢键的皮肤友好型导电水凝胶。所获得的具有温度触发可调力学的 PVA/PA/Gel (PPG) 水凝胶可以在热敷下可靠地粘附在皮肤上并检测电生理信号，同时在冷敷下很容易去除。此外，透明度的额外优势，PPG 水凝胶的透气性和抗菌活性确保了其在皮肤上的长期佩戴价值。生产过程中废弃的PPG水凝胶可以通过可逆的物理键合进行回收利用，既环保又节约成本。PPG水凝胶传感器有望在记录人体健康监测中的电生理信号方面具有良好的应用前景。