Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.
Nanoscale. 2019 Feb 28;11(9):3804-3813. doi: 10.1039/c8nr08399a.
We demonstrate a highly durable and stretchable carbon nanotube (CNT)-polymer transparent conductive film by utilizing polyacrylic acid wrapping to simultaneously disperse and dope CNTs. This novel strategy not only enables an easy and industrially scalable process where neither removal of dispersant nor further doping is necessary, but also results in a boost in the conductivity and durability, and correspondingly it provides infinite versatility for various applications. A significant improvement in conductivity being comparable to acid doping is achieved through a hybrid structure in which a polyacrylic acid monolayer helically and partially wraps the CNT surface. The optimum films show sheet resistances of 150 and 60 Ω per square at 91% and 84% optical transmittances, respectively. Notably, the sheet resistances of hybrid films remain almost constant after aging tests under conditions of 85 °C and 85% relative humidity for more than 3000 h, and bending and stretching tests of more than 1 million cycles, suggesting outstanding long-term stability and record-high flexibility and stretchability. Therefore, the highly transparent conductive film, combined with excellent long-term and mechanical durability, and surprisingly easy processability, opens new routes for next-generation wearable electronics and bioelectronics.
我们通过利用聚丙烯酸（PAA）包裹来同时分散和掺杂 CNT，展示了一种具有高耐用性和拉伸性的碳纳米管（CNT）-聚合物透明导电薄膜。这种新颖的策略不仅实现了简单且具有工业可扩展性的工艺，既不需要去除分散剂也不需要进一步掺杂，而且还提高了导电性和耐用性，相应地为各种应用提供了无限的多功能性。通过聚丙烯酸单层螺旋和部分包裹 CNT 表面的混合结构，实现了与酸掺杂相当的显著导电性提升。优化后的薄膜在 91%和 84%的透光率下，方阻分别达到 150 和 60 Ω/平方。值得注意的是，在 85°C 和 85%相对湿度的老化测试条件下超过 3000 小时，以及超过 100 万次的弯曲和拉伸测试后，混合薄膜的方阻几乎保持不变，这表明其具有出色的长期稳定性和创纪录的高灵活性和拉伸性。因此，这种高透明导电薄膜结合了优异的长期和机械耐用性以及令人惊讶的易于加工性，为下一代可穿戴电子设备和生物电子学开辟了新的途径。
