基于碳纳米管/聚乙烯醇的自愈合柔性电极

对多壁碳纳米管 (MWCNT) 进行回流酸处理，增加其表面活性获得羧基化多壁碳纳米管(CMWCNT)，结合聚乙烯醇 (PVA) 形成多功能导电水凝胶。借助CMWCNT表面羧基活性基团，与多重络合、纠缠的PVA链形成广泛氢键，构建CMWCNT-PVA水凝胶分层网络。通过丝网印刷工艺，制备CMWCNT-PVA自愈合柔性电极，该电极具有高电导率(35.1 S/m) 、高机械强度 (2000次循环弯曲) 和约10秒的自愈合特性，愈合后电路中，在大变形下也保持优异导电性和稳定性，且由柔性电路设计制备的发光二极管阵列，能够呈现HF发光图案。该自愈合柔性电极为柔性电路发展提供一种新的策略，对拓展电子皮肤、软体机器人和可穿戴设备等在人机交互中的应用具有重要科学意义。

Self-Healing Flexible Electrodes Based on Carbon Nanotubes/Polyvinyl Alcohol

Carboxylated multi-walled carbon nanotubes (CMWCNT) were obtained by subjecting multi-walled carbon nanotube (MWCNT) to reflux acid treatment. Then, CMWCNT were combined with polyvinyl alcohol (PVA) to form multifunctional conductive hydrogels. The multi-complexed and entangled PVA chains, and the presence of active groups (carboxyl groups, etc.) on the CMWCNT surface after treatment enable it to form extensive hydrogen bonds with PVA, completing the preparation of the hierarchical network of CMWCNT-PVA hydrogels. Finally, the preparation of CMWCNT-PVA self-healing flexible electrodes was completed by screen printing. CMWCNT-PVA has low resistivity (35.1S/m), high mechanical strength (2000 cycles of bending), and self-healing properties of about 10 seconds. In the circuit after healing, it can maintain excellent conductivity and stability even under large deformation. Through the design of flexible circuit, the preparation of light-emitting diode array is completed, showing HF light-emitting pattern. The self-healing flexible electrode provides a new strategy for the development of flexible circuits, which is of great scientific significance for expanding the application of electronic skin, soft robots and wearable devices in human-computer interaction.