Automatic Sorting of Single-Chirality Single-Wall Carbon Nanotubes Using Hydrophobic Cholates: Implications for Multicolor Near-Infrared Optical Technologies
Automatic Sorting of Single-Chirality Single-Wall Carbon Nanotubes Using Hydrophobic Cholates: Implications for Multicolor Near-Infrared Optical Technologies
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DOI：
10.1021/acsanm.0c02389
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Yohei Yomogida;Takeshi Tanaka;Mayumi Tsuzuki;Xiaojun Wei;H. Kataura
中科院分区：
文献类型：
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作者：
Yohei Yomogida;Takeshi Tanaka;Mayumi Tsuzuki;Xiaojun Wei;H. Kataura
单壁碳纳米管（SWCNTs）的单手性分离对于利用SWCNTs固有的高性能是重要的。含有胆酸盐衍生物的混合表面活性剂体系通常用于单手性分离，但手性选择分辨率仍然很低。本文系统地研究了胆酸盐衍生物在吸附色谱中对手性选择的影响，以提高分离度。7种胆酸盐衍生物的对比实验表明，衍生物的疏水性对分离结果有很大的影响，其中疏水性强的胆酸盐具有最高的分离选择性。所有的分离结果都可以用疏水相互作用来解释。最后，这些发现被用来最大限度地提高单手性分离分辨率。结果，20个特定的手性富集的纳米管，包括11个高纯度的单手性物种，可以从一瓶纳米管溶液中自动分选。所获得的（n，m）物种表现出各种各样的激发和发射波长，是有用的近红外光学技术的光学过渡波长的选择是有限的。特别地，（7，5）和（7，6）[或（9，4）、（8，6）和（8，7）] SWCNT可用作近红外磷光体用于生物成像。
Single-chirality separation of single-wall carbon nanotubes (SWCNTs) is important for taking advantage of the inherent high performance of SWCNTs. Mixed surfactant systems containing cholate derivatives have commonly been used for single-chirality separation, but the chirality selection resolution remains low. This study systematically investigates the effect of cholate derivatives on chirality selection in adsorption chromatography to improve the resolution. Comparative experiments using seven cholate derivatives reveal that the separation results highly depend on the hydrophobicity of the derivative, and the highly hydrophobic cholates can achieve the highest-resolution selectivity. All separation results can be explained by hydrophobic interactions. Finally, these findings are used to maximize the single-chirality separation resolution. As a result, 20 specific chirality-enriched nanotubes, including 11 high-purity single-chirality species, can be automatically sorted from one bottle of nanotube solution. The obtained (n,m) species exhibit a variety of excitation and emission wavelengths and are useful for near-infrared optical technologies where the choice of optical transition wavelengths is limited. In particular, (7,5) and (7,6) [or (9,4), (8,6), and (8,7)] SWCNTs are useful as near-infrared phosphors for multicolor bioimaging.