Conjugated polymer extraction (CPE) has been shown to be a highly effective method to isolate high-purity semiconducting single-walled carbon nanotubes (sc-SWCNTs). In both literature reports and industrial manufacturing, this method has enabled enrichment of sc-SWCNTs with high purity (≥99.9%). High selectivity is typically obtained in nonpolar aromatic solvents, yet polar solvents may provide process improvements in terms of yield, purity and efficiency. Using an amphiphilic fluorene-alt-pyridine conjugated copolymer with hydrophilic side chains, we have investigated the enrichment of sc-SWCNTs in polar solvents. Various conditions such as polymer/SWCNT ratio, solvent polarity, solvent dielectric constant as well as polymer solubility and SWCNT dispersibility were explored in order to optimize the purity and yield of the enriched product. Herein, we provide insights on CPE by demonstrating that a conjugated polymer having a hydrophobic backbone and hydrophilic oligo(ethylene oxide) side chains provides near full recovery (95%) of sc-SWCNTs using a multiextraction protocol. High purity is also obtained, and differences in chiral selectivity compared to analogous hydrophobic systems were confirmed by optical absorption and Raman spectroscopy as well as photoluminescence excitation mapping. Taking into consideration the solvent dielectric constant, polarity index as well as polymer solubility and SWCNT dispersibility provides a better understanding of structure–property effects on sc-SWCNT enrichment. The resulting hydrophilic SWCNT dispersions demonstrate long-term colloidal stability, making them suitable for ink formulation and high-performance thin-film transistors fabrication.

中文翻译：

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两亲性共轭聚合物在极性溶剂中对半导体单壁碳纳米管的分类提供了富集的一般准则

共轭聚合物萃取（CPE）已被证明是一种分离高纯度半导体单壁碳纳米管（sc-SWCNTs）的高效方法。在文献报道和工业制造中，该方法都可以富集高纯度（≥99.9％）的sc-SWCNT。通常在非极性芳族溶剂中可获得高选择性，但是极性溶剂可以在产率，纯度和效率方面提供工艺上的改进。使用两亲芴ALT吡啶具有亲水性侧链的共轭共聚物，我们研究了sc-SWCNTs在极性溶剂中的富集。探索了各种条件，例如聚合物/ SWCNT比率，溶剂极性，溶剂介电常数以及聚合物溶解度和SWCNT分散性，以优化浓缩产品的纯度和收率。在本文中，我们通过证明具有疏水性主链和亲水性寡聚（环氧乙烷）侧链的共轭聚合物可通过多萃取方案将sc-SWCNT的回收率提高到近乎完全（95％），从而提供了有关CPE的见解。还获得了高纯度，并且通过光吸收和拉曼光谱以及光致发光激发图谱证实了与类似的疏水性体系相比，手性选择性的差异。考虑到溶剂的介电常数，极性指数以及聚合物的溶解度和SWCNT的分散性，可以更好地理解结构性质对sc-SWCNT富集的影响。所得的亲水性SWCNT分散体表现出长期的胶体稳定性，使其适用于油墨配方和高性能薄膜晶体管的制造。