The rapid development of global big health and AI technology has made electrocardiogram (ECG) monitoring in all scenarios more important. While real-time ECG monitoring in the air is easy to realize, underwater ECG monitoring is still challenging for general hydrogels. Herein, we prepared a hydrogel with underwater viscosity, biocompatibility, and excellent mechanical properties by hydrophobic graft-modified of PVA (POV) hydrogel and used it to prepare electrodes for underwater ECG monitoring. The POV hydrogel is very flexible and co-deforms easily with the skin, with a Young's modulus as low as 0.03 MPa and underwater adhesion strength up to 11 KPa. The hydrophobic chain segments within the POV hydrogel give the hydrophobic gel excellent stability, adhesion, and ionic conductivity given by the free ionic groups within the POV hydrogel enable the POV hydrogel to detect and transmit physiological electrical signals. Compared to commercial gel electrodes, this POV electrode has better adhesion, conductivity and stability underwater. The POV gel electrodes can effectively collect real-time ECG signals in the air and underwater. Therefore, this study effectively broaden the application of POV hydrogels in ECG biosensors for underwater cardiac sensing.

中文翻译：

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迈克尔加成联合凝胶化策略的疏水接枝改性 PVA 水凝胶用于水下心脏传感


全球大健康和人工智能技术的快速发展，让全场景心电图监测变得更加重要。虽然空中实时心电监测很容易实现，但水下心电监测对于一般水凝胶来说仍然具有挑战性。在此，我们通过对PVA（POV）水凝胶进行疏水接枝改性，制备了一种具有水下粘度、生物相容性和优异机械性能的水凝胶，并用其制备了用于水下心电监测的电极。 POV水凝胶非常柔韧，很容易与皮肤共同变形，杨氏模量低至0.03 MPa，水下粘附强度高达11 KPa。 POV水凝胶内的疏水链段赋予疏水凝胶优异的稳定性、粘附性和由POV水凝胶内的自由离子基团赋予的离子电导率，使得POV水凝胶能够检测和传输生理电信号。与商业凝胶电极相比，这种POV电极在水下具有更好的附着力、导电性和稳定性。 POV凝胶电极可以有效地采集空气和水下的实时心电信号。因此，本研究有效拓宽了 POV 水凝胶在心电图生物传感器中水下心脏传感的应用。