Department of Chemistry, Seoul National University, Seoul, 08826, Korea.
Nat Commun. 2021 May 10;12(1):2602. doi: 10.1038/s41467-021-22879-6.
Semi-conducting two-dimensional (2D) nanoobjects, prepared by self-assembly of conjugated polymers, are promising materials for optoelectronic applications. However, no examples of self-assembled semi-conducting 2D nanosheets whose lengths and aspect ratios are controlled at the same time have been reported. Herein, we successfully prepared uniform semi-conducting 2D sheets using a conjugated poly(cyclopentenylene vinylene) homopolymer and its block copolymer by blending and heating. Using these as 2D seeds, living crystallization-driven self-assembly (CDSA) was achieved by adding the homopolymer as a unimer. Interestingly, unlike typical 2D CDSA examples showing radial growth, this homopolymer assembled only in one direction. Owing to this uniaxial growth, the lengths of the 2D nanosheets could be precisely tuned from 1.5 to 8.8 μm with narrow dispersity according to the unimer-to-seed ratio. We also studied the growth kinetics of the living 2D CDSA and confirmed first-order kinetics. Subsequently, we prepared several 2D block comicelles (BCMs), including penta-BCMs in a one-shot method.
由共轭聚合物自组装制备的半导体二维（2D）纳米物体是光电应用有前途的材料。然而，尚未报道过同时控制长度和纵横比的自组装半导体 2D 纳米片的例子。在此，我们通过共混和加热成功地使用共轭聚环戊烯乙烯基均聚物及其嵌段共聚物制备了均匀的半导体 2D 片。使用这些作为 2D 种子，通过添加均聚物作为单体实现了活的结晶驱动自组装（CDSA）。有趣的是，与典型的显示径向生长的 2D CDSA 实例不同，该均聚物仅沿一个方向组装。由于这种单轴生长，可以根据单体与种子的比例精确地将 2D 纳米片的长度从 1.5μm 调至 8.8μm，分散性较窄。我们还研究了活的 2D CDSA 的生长动力学，并证实了一级动力学。随后，我们制备了几种 2D 嵌段共胶束（BCM），包括一次法制备的五嵌段共胶束。
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