导电水凝胶在生物医学和健康监测领域受到广泛关注。然而,它们的实际应用严重阻碍了漫长和能源密集的聚合过程和弱的机械性能。这里,设计了一种聚丙烯酸/明胶双网络有机水凝胶的快速聚合方法,方法是将单宁酸(TA)和Ag纳米颗粒在导电MXene纳米片上作为催化剂,在水和甘油的二元溶剂中,不需要外部能量输入。TA和AgNP的协同作用维持了系统内苯酚和醌的动态氧化还原活性,提高过硫酸铵产生自由基的效率,导致聚合在10分钟内。此外,三元复合MXene@TA-Ag可以作为导电剂,增强填料,粘合促进剂,和有机水凝胶的抗菌剂,赋予他们出色的多功能。有机水凝胶表现出优异的拉伸性(1740%)和高拉伸强度(184kPa)。基于有机水凝胶的应变传感器表现出超高灵敏度(GF=3.86),低检测限(0.1%),和出色的稳定性(>1000次循环,>7天)。这些传感器可以监测人体肢体的运动,呼吸和声带振动,以及各种级别的动脉。因此,这种有机水凝胶具有在人类健康监测和语音识别等领域的应用潜力。
Conductive hydrogels have attracted widespread attention in the fields of biomedicine and health monitoring. However, their practical application is severely hindered by the lengthy and energy-intensive polymerization process and weak mechanical properties. Here, a rapid polymerization method of polyacrylic acid/gelatin double-network organohydrogel is designed by integrating tannic acid (TA) and Ag nanoparticles on conductive MXene nanosheets as catalyst in a binary solvent of water and glycerol, requiring no external energy input. The synergistic effect of TA and Ag NPs maintains the dynamic redox activity of phenol and quinone within the system, enhancing the efficiency of ammonium persulfate to generate radicals, leading to polymerization within 10 min. Also, ternary composite MXene@TA-Ag can act as conductive agents, enhanced fillers, adhesion promoters, and antibacterial agents of organohydrogels, granting them excellent multi-functionality. The organohydrogels exhibit excellent stretchability (1740%) and high tensile strength (184 kPa). The strain sensors based on the organohydrogels exhibit ultrahigh sensitivity (GF = 3.86), low detection limit (0.1%), and excellent stability (>1000 cycles, >7 days). These sensors can monitor the human limb movements, respiratory and vocal cord vibration, as well as various levels of arteries. Therefore, this organohydrogel holds potential for applications in fields such as human health monitoring and speech recognition.