Department of Chemical Engineering, Stanford University, California 94305, USA.
Nat Commun. 2011 Nov 15;2:541. doi: 10.1038/ncomms1545.
Conjugated polymers, such as polyfluorene and poly(phenylene vinylene), have been used to selectively disperse semiconducting single-walled carbon nanotubes (sc-SWNTs), but these polymers have limited applications in transistors and solar cells. Regioregular poly(3-alkylthiophene)s (rr-P3ATs) are the most widely used materials for organic electronics and have been observed to wrap around SWNTs. However, no sorting of sc-SWNTs has been achieved before. Here we report the application of rr-P3ATs to sort sc-SWNTs. Through rational selection of polymers, solvent and temperature, we achieved highly selective dispersion of sc-SWNTs. Our approach enables direct film preparation after a simple centrifugation step. Using the sorted sc-SWNTs, we fabricate high-performance SWNT network transistors with observed charge-carrier mobility as high as 12 cm(2) V(-1) s(-1) and on/off ratio of >10(6). Our method offers a facile and a scalable route for separating sc-SWNTs and fabrication of electronic devices.
共轭聚合物，如聚芴和聚对苯乙烯，已被用于选择性分散半导体单壁碳纳米管（sc-SWNTs），但这些聚合物在晶体管和太阳能电池中的应用有限。区域规整的聚（3-烷基噻吩）（rr-P3ATs）是用于有机电子的最广泛使用的材料，并且已经观察到它们可以缠绕在 SWNTs 周围。然而，在此之前，sc-SWNTs 的排序还没有实现。在这里，我们报告了 rr-P3ATs 在 sc-SWNTs 排序中的应用。通过合理选择聚合物、溶剂和温度，我们实现了 sc-SWNTs 的高度选择性分散。我们的方法可以在简单的离心步骤后直接制备薄膜。使用排序后的 sc-SWNTs，我们制备了高性能的 SWNT 网络晶体管，观察到的电荷载流子迁移率高达 12 cm(2) V(-1) s(-1)，开关比>10(6)。我们的方法为分离 sc-SWNTs 和制造电子器件提供了一种简单且可扩展的途径。
