Yamauchi Mitsuaki, Nakatsukasa Kanako, Kubo Naoki, Yamada Hiroko, Masuo Sadahiro
Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan.
Department of Applied Chemistry for Environment, Kwansei Gakuin University, 1 Gakuen, Uegahara, Sanda, Hyogo, 669-1330, Japan.
Angew Chem Int Ed Engl. 2024 Jan 2;63(1):e202314329. doi: 10.1002/anie.202314329. Epub 2023 Nov 29.
Colloidal quantum dots (QDs) exhibit important photophysical properties, such as long-range energy diffusion, miniband formation, and collective photoluminescence, when aggregated into well-defined superstructures, such as three-dimensional (3D) and two-dimensional (2D) superlattices. However, the construction of one-dimensional (1D) QD superstructures, which have a simpler arrangement, is challenging; therefore, the photophysical properties of 1D-arranged QDs have not been studied previously. Herein, we report a versatile strategy to obtain 1D-arranged QDs using a supramolecular polymer (SP) template. The SP is composed of self-assembling cholesterol derivatives containing two amide groups for hydrogen bonding and a carboxyl group as an adhesion moiety on the QDs. Upon mixing the SP and dispersed QDs in low-polarity solvents, the QDs self-adhered to the SP and self-arranged into 1D superstructures through van der Waals interactions between the surface organic ligands of the QDs, as confirmed by transmission electron microscopy. Furthermore, we revealed efficient photoinduced fluorescence resonance energy transfer between the 1D-arranged QDs by an in-depth analysis of the emission spectra and decay curves.
当聚集形成明确的超结构，如三维（3D）和二维（2D）超晶格时，胶体量子点（QDs）表现出重要的光物理性质，如长程能量扩散、微带形成和集体光致发光。然而，具有更简单排列的一维（1D）量子点超结构的构建具有挑战性；因此，此前尚未研究过一维排列量子点的光物理性质。在此，我们报告了一种使用超分子聚合物（SP）模板获得一维排列量子点的通用策略。该超分子聚合物由自组装的胆固醇衍生物组成，其含有两个用于氢键作用的酰胺基团和一个作为量子点上粘附部分的羧基。在低极性溶剂中将超分子聚合物和分散的量子点混合后，量子点通过量子点表面有机配体之间的范德华相互作用自粘附到超分子聚合物上并自组装成一维超结构，这一点通过透射电子显微镜得到证实。此外，通过对发射光谱和衰减曲线的深入分析，我们揭示了一维排列量子点之间高效的光致荧光共振能量转移。
