Cai Jiandong, Chua Xian Wei, Li Chen, Grüne Jeannine, Ghosh Pratyush, Ding Yuanfei, MacKenzie Harvey K, Qiu Huibin, Greenham Neil C, Rao Akshay, Manners Ian
Department of Chemistry, Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, Victoria, British Columbia, Canada.
Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, UK.
Nat Mater. 2025 Aug 22. doi: 10.1038/s41563-025-02336-1.
The creation of discrete organic semiconducting two-dimensional nanomaterials with high crystalline order, controlled dimensions and enhanced energy transport capability represents a major challenge. We describe the preparation of uniform rectangular platelet micelles comprising a highly ordered, crystalline semiconducting poly(di-n-hexylfluorene) core by means of seeded growth methods. The rectangular core is constructed by the π-π stacking of tilted fluorene units and the solvophobic stacking of alkyl side chains. The core structure enables long-range anisotropic exciton diffusion, particularly in the direction of interchain π-π stacking, with a diffusion coefficient of up to 2.56 ± 0.52 cm s and diffusion lengths of >500 nm. The segmented platelet comicelles, with concentric patches comprising distinct coronas, exhibit efficient energy transfer over hundreds of nanometres from the central higher-energy core to the peripheral lower-energy polythiophene corona. Our results open emerging avenues for the design of two-dimensional organic-semiconductor-based nanostructures, which could find applications in optoelectronics, sensing and photocatalysis.
制备具有高结晶度、可控尺寸和增强能量传输能力的离散有机半导体二维纳米材料是一项重大挑战。我们描述了通过种子生长法制备由高度有序的结晶半导体聚（二正己基芴）核组成的均匀矩形片状胶束。矩形核由倾斜芴单元的π-π堆积和烷基侧链的疏溶剂堆积构成。核结构实现了长程各向异性激子扩散，特别是在链间π-π堆积方向上，扩散系数高达2.56±0.52 cm s，扩散长度大于500 nm。具有由不同冠层组成的同心斑块的分段片状胶束，表现出从中心较高能量的核到外围较低能量的聚噻吩冠层在数百纳米范围内的高效能量转移。我们的结果为基于二维有机半导体的纳米结构设计开辟了新途径，这些结构可用于光电子学、传感和光催化领域。
