Conjugated polymer extraction (CPE) is a low-cost, scalable process that can enrich single-walled carbon nanotube (SWCNT) materials in organic media. For other separation methods in aqueous phases, redox chemistry and/or pH control dramatically affect the sorting process of the SWCNTs. We have previously determined that the CPE process can be fine-tuned by adjusting the pH on the tube surface. Here, we systematically studied the effect of redox chemistry on the CPE process by adding organic p-/n-dopants. At a very strong p-/n-doping level, static repulsions dominated the interactions between the tubes and the CPE lost selectivity. When the doping level changed from a medium p-doping to a neutral state, the yield of CPE increased and the selectivity was compromised. We also observed chiral selectivity when a weak p-dopant was used. A photoluminescence excitation mapping under different titration conditions provided more insight into the doping level of the tubes relative to their diameters, chiralities, and redox potentials. We proposed a mechanism for the CPE process. The semiconducting and metallic tubes are separated because of their different solubilities, which are determined by the bundling energy between the tubes and are related to their doping level in polymer solutions.

中文翻译：

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半导体单壁碳纳米管的掺杂剂调制共轭聚合物富集

共轭聚合物萃取 (CPE) 是一种低成本、可扩展的工艺，可以在有机介质中富集单壁碳纳米管 (SWCNT) 材料。对于水相中的其他分离方法，氧化还原化学和/或 pH 控制显着影响 SWCNT 的分选过程。我们之前已经确定，可以通过调节管表面的 pH 值来微调 CPE 过程。在这里，我们通过添加有机 p-/n-掺杂剂系统地研究了氧化还原化学对 CPE 过程的影响。在非常强的 p-/n 掺杂水平下，静态排斥力主导了管子之间的相互作用，CPE 失去了选择性。当掺杂水平从中等p型掺杂变为中性状态时，CPE的产率增加，但选择性受到损害。我们还观察到使用弱 p 掺杂剂时的手性选择性。不同滴定条件下的光致发光激发图可以更深入地了解管相对于其直径、手性和氧化还原电位的掺杂水平。我们提出了 CPE 流程的机制。半导体管和金属管由于溶解度不同而被分开，溶解度是由管之间的集束能决定的，并且与它们在聚合物溶液中的掺杂水平有关。