The design and fabrication of conductive hydrogels with high stretchability, compressibility, self-healing properties and good adhesion remains a significant challenge. We have fabricated composite hydrogels by random polymerization of acrylic acid (AA) and dopamine (DA) in the presence of multi-walled carbon nanotubes (MWCNTs). The π-π interaction between DA and MWCNTs makes MWCNTs stably and homogenously dispersed in water. The fabricated PAA-PDA/CNT composite hydrogels possess relatively high mechanical strength (maximum Young’s modulus: 800 kPa) and can be stretched to 1280% strain and compressed to 80% strain. The multiple hydrogen bonding formed between functional groups of PAA-PDA and MWCNTs can effectively dissipate energy and quickly achieve self-healing. The composite hydrogels also show good adhesion and can easily adhere to various inorganic or organic surfaces. In addition, the hydrogel reveals stable strain sensitivity and can be used as skin sensors.

具有高拉伸性，可压缩性，自修复性能和良好粘合性的导电水凝胶的设计和制造仍然是一项重大挑战。我们通过在多壁碳纳米管（MWCNT）存在下通过丙烯酸（AA）和多巴胺（DA）的无规聚合反应制备了复合水凝胶。该π-πDA和MWCNT之间的相互作用使MWCNT稳定且均匀地分散在水中。制备的PAA-PDA / CNT复合水凝胶具有相对较高的机械强度（最大杨氏模量：800 kPa），可以拉伸至1280％应变，压缩至80％应变。PAA-PDA和MWCNTs的官能团之间形成的多个氢键可以有效地耗散能量并快速实现自我修复。复合水凝胶还显示出良好的粘附性，并且可以轻松粘附至各种无机或有机表面。此外，水凝胶显示出稳定的应变敏感性，可用作皮肤传感器。