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<p>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-<i>n</i>-hexylfluorene) core by means of seeded growth methods. The rectangular core is constructed by the <i>π</i>–<i>π</i> 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 <i>π</i>–<i>π</i> stacking, with a diffusion coefficient of up to 2.56 ± 0.52 cm<sup>2</sup> s<sup>−1</sup> and diffusion lengths of &gt;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.</p>

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Uniform conjugated polymer rectangular platelets exhibiting long-range exciton diffusion

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Jiandong Cai,
  • Xian Wei Chua,
  • Chen Li,
  • Jeannine Grüne,
  • Pratyush Ghosh,
  • Yuanfei Ding,
  • Harvey K. MacKenzie,
  • Huibin Qiu,
  • Neil C. Greenham,
  • Akshay Rao,
  • Ian Manners

摘要

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 cm2 s−1 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.