The helicity sorting and optical resolution of single-walled carbon nanotube (SWNT) derivatives were investigated to elucidate their fundamental properties and to fully understand their application scope. Herein, the helicity sorting and optical resolution of functionalized SWNTs (SWNTs-xylyl), which were prepared by reductive alkylation using 1,2-bis(bromomethyl)benzene, were achieved for the first time via gel chromatography using an agarose gel as the stationary phase. By applying a stepwise elution, three surfactant types (6,4) SWNTs-xylyl, (11,–5) SWNTs-xylyl, and (6,5) SWNTs-xylyl were successfully separated and characterized. The circular dichroism spectra of (11,–5) SWNTs-xylyl and (6,5) SWNTs-xylyl were mirror images of each other along the abscissa, confirming the successful enantiomeric separation of these functionalized SWNTs. Both of the SWNTs-xylyl enantiomers showed red-shifted near-infrared (NIR) photoluminescence (PL) peaks, which were assigned to quantum defects formed by the chemical modification process. The intensity of the red-shifted PL peak of SWNTs-xylyl significantly increased after the separation. Compared to the sample before the separation, the purified (6,5) SWNTs-xylyl exhibited a considerable red-shifted PL with reduced concentration quenching effects. Owing to these properties, the helicity sorting and optical resolution of functionalized SWNTs may have practical applications as efficient NIR optical materials.

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功能化单壁碳纳米管的螺旋排序和光学分辨率及其光学性质

研究了单壁碳纳米管（SWNT）衍生物的螺旋排序和光学拆分，以阐明其基本性质并充分了解其应用范围。本文中，首次使用琼脂糖凝胶作为固定剂，通过凝胶色谱法，通过使用1,2-双（溴甲基）苯进行还原烷基化制备的功能化SWNT（SWNTs-二甲苯基）的螺旋度分选和光学拆分相。通过逐步洗脱，成功分离并表征了三种表面活性剂类型（6,4）SWNTs-二甲苯基，（11，-5）SWNTs-二甲苯基和（6,5）SWNTs-二甲苯基。（11，–5）SWNTs-二甲苯基和（6,5）SWNTs-二甲苯基的圆二色光谱沿横坐标彼此互为镜像，从而证实了这些功能化SWNT的成功对映异构体分离。两个SWNTs-二甲苯基对映异构体均显示红移的近红外（NIR）光致发光（PL）峰，这些峰被分配给由化学修饰过程形成的量子缺陷。分离后SWNTs-二甲苯基的红移PL峰的强度显着增加。与分离前的样品相比，纯化的（6,5）SWNTs-二甲苯基表现出相当大的红移PL，具有降低的浓度猝灭效果。由于这些特性，功能化SWNT的螺旋分选和光学分辨率可能作为有效的NIR光学材料具有实际应用。分离后，SWNTs-二甲苯基的红移PL峰的强度显着增加。与分离前的样品相比，纯化的（6,5）SWNTs-二甲苯基表现出相当大的红移PL，具有降低的浓度猝灭效果。由于这些特性，功能化SWNT的螺旋分选和光学分辨率可能作为有效的NIR光学材料具有实际应用。分离后SWNTs-二甲苯基的红移PL峰的强度显着增加。与分离前的样品相比，纯化的（6,5）SWNTs-二甲苯基表现出相当大的红移PL，具有降低的浓度猝灭效果。由于这些特性，功能化SWNT的螺旋分选和光学分辨率可能作为有效的NIR光学材料具有实际应用。