The enantiomer-level isolation of single-walled carbon nanotubes (SWCNTs) in high concentration and with high purity for nanotubes greater than 1.1 nm in diameter is demonstrated using a two-stage aqueous two-phase extraction (ATPE) technique. In total, five different nanotube species of ∼1.41 nm diameter are isolated, including both metallics and semiconductors. We characterize these populations by absorbance spectroscopy, circular dichroism spectroscopy, resonance Raman spectroscopy, and photoluminescence mapping, revealing and substantiating mod-dependent optical dependencies. Using knowledge of the competitive adsorption of surfactants to the SWCNTs that controls partitioning within the ATPE separation, we describe an advanced acid addition methodology that enables the fine control of the separation of these select nanotubes. Furthermore, we show that endohedral filling is a previously unrecognized but important factor to ensure a homogeneous starting material and further enhance the separation yield, with the best results for alkane-filled SWCNTs, followed by empty SWCNTs, with the intrinsic inhomogeneity of water-filled SWCNTs causing them to be worse for separations. Lastly, we demonstrate the potential use of these nanotubes in field-effect transistors.

中文翻译：

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大直径条件下特定单对映体单壁碳纳米管的分离。

使用两步水两相萃取（ATPE）技术证明了直径大于1.1 nm的纳米管的高浓度高纯度单壁碳纳米管（SWCNT）的对映体级分离。总共分离出了5种不同的直径约为1.41 nm的纳米管，包括金属和半导体。我们通过吸光度光谱，圆二色性光谱，共振拉曼光谱和光致发光映射来表征这些种群，揭示和证实依赖于mod的光学依赖性。利用表面活性剂对SWCNT的竞争性吸附知识（可控制ATPE分离内的分配），我们描述了一种先进的酸添加方法，可对这些选择的纳米管的分离进行精细控制。此外，我们显示，内向填充是确保材料均一并进一步提高分离产率的一个先前未被认识到的重要因素，对于烷烃填充的SWCNT，其次是空的SWCNT，最好的结果是水填充的SWCNT的内在不均匀性对于分离，它们会更糟。最后，我们证明了这些纳米管在场效应晶体管中的潜在用途。