Conductive hydrogels are of significant interest because of their important applications in flexible electronics, energy storage, and human-computer interaction. However, the deficiencies of weak electrical conductivity and mechanical properties seriously hinder the applications of conductive hydrogels in these frontier areas. In this research, conductive hydrogels with high electrical conductivity, excellent self-recovery properties and outstanding photothermal effects are prepared by synergistic interaction of dopamine, silica nanoparticles, graphite nano-powder (Grn) and polyacrylamide chains. The effects of Grn and temperature on the conductivity of the hydrogels are investigated in detail. The hydrogels feature highest conductivity (7.2 mS/cm) and even 9.1 mS/cm at 60 °C due to the excellent thermal and electrical conductivity of Grn, which also endows the hydrogels with excellent photothermal effect and stable energy storage properties. Notably, the catechol group of dopamine (DA) leads to excellent self-adhesive properties of the conductive hydrogels. The use of silicon dioxide nanoparticles (SNs) allows the conductive hydrogels to obtain favorable toughness as well as self-recovery properties. This provides a broad prospect for the applications of conductive hydrogels in practice.

导电水凝胶因其在柔性电子、能量存储和人机交互方面的重要应用而引起人们的极大兴趣。然而，导电水凝胶弱的导电性和机械性能的缺陷严重阻碍了导电水凝胶在这些前沿领域的应用。本研究通过多巴胺、二氧化硅纳米颗粒、石墨纳米粉体（Grn）和聚丙烯酰胺链的协同相互作用，制备了具有高电导率、优异的自恢复性能和突出的光热效应的导电水凝胶。详细研究了 Grn 和温度对水凝胶电导率的影响。由于Grn优异的导热性和导电性，该水凝胶具有最高的电导率（7.2 mS/cm），在60 °C时甚至达到9.1 mS/cm，这也赋予了水凝胶优异的光热效应和稳定的储能性能。值得注意的是，多巴胺（DA）的儿茶酚基团使导电水凝胶具有优异的自粘性能。二氧化硅纳米粒子（SN）的使用使导电水凝胶获得良好的韧性和自恢复性能。这为导电水凝胶的实际应用提供了广阔的前景。