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Long-range energy transport in single supramolecular nanofibres at room temperature

机译：室温下单分子超纳米纤维的远距离能量传输

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摘要

Efficient transport of excitation energy over long distances is a key process in light-harvesting systems, as well as in molecular electronics(1-3). However, in synthetic disordered organic materials, the exciton diffusion length is typically only around 10 nanometres (refs 4, 5), or about 50 nanometres in exceptional cases(6,7), a distance that is largely determined by the probability laws of incoherent exciton hopping. Only for highly ordered organic systems has the transport of excitation energy over macroscopic distances been reported-for example, for triplet excitons in anthracene single crystals at room temperature(8), as well as along single polydiacetylene chains embedded in their monomer crystalline matrix at cryogenic temperatures (at 10 kelvin, or -263 degrees Celsius)(9). For supramolecular nanostructures, uniaxial long-range transport has not been demonstrated at room temperature. Here we show that individual self-assembled nanofibres with molecular-scale diameter efficiently transport singlet excitons at ambient conditions over more than four micrometres, a distance that is limited only by the fibre length. Our data suggest that this remarkable long-range transport is predominantly coherent. Such coherent long-range transport is achieved by one-dimensional self-assembly of supramolecular building blocks, based on carbonyl-bridged triarylamines10, into well defined H-type aggregates (in which individual monomers are aligned cofacially) with substantial electronic interactions. These findings may facilitate the development of organic nanophotonic devices and quantum information technology.
机译：激发能量在长距离上的有效传输是光收集系统以及分子电子学中的关键过程（1-3）。然而，在合成无序有机材料中，激子扩散长度通常仅为10纳米左右（参考文献4、5），在特殊情况下约为6纳米（6,7），该距离很大程度上取决于非相干的概率定律。激子跳跃。仅在高度有序的有机体系中才报道了在宏观距离上激发能的传输-例如，室温下蒽单晶中的三重态激子（8），以及低温时沿着嵌入其单体晶体基质中的单聚二乙炔链温度（10开尔文或-263摄氏度）（9）。对于超分子纳米结构，尚未在室温下证明单轴长距离传输。在这里，我们显示具有分子尺度直径的单个自组装纳米纤维在环境条件下能有效地运输单重态激子超过四微米，该距离仅受纤维长度的限制。我们的数据表明，这种非凡的远距离传输主要是连贯的。这种相干的远距离传输是通过基于羰基桥联的三芳基胺10的超分子结构单元的一维自组装，通过具有充分的电子相互作用的，定义明确的H型聚集体（其中各个单体进行界面排列）实现的。这些发现可能促进有机纳米光子器件和量子信息技术的发展。

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  • 来源
    《Nature》 |2015年第7559期|196-199|共4页
  • 作者

    Haedler Andreas T.; Kreger Klaus; Issac Abey; Wittmann Bernd; Kivala Milan; Hammer Natalie; Koehler Juergen; Schmidt Hans-Werner; Hildner Richard;

  • 作者单位

    Univ Bayreuth, Macromol Chem 1, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Ctr Colloids & Interfaces, D-95440 Bayreuth, Germany;

    Univ Bayreuth, Macromol Chem 1, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Ctr Colloids & Interfaces, D-95440 Bayreuth, Germany;

    Univ Bayreuth, Expt Phys 4, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany;

    Univ Bayreuth, Expt Phys 4, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany;

    Univ Erlangen Nurnberg, Dept Chem & Pharm, Chair Organ Chem 1, D-91054 Erlangen, Germany;

    Univ Erlangen Nurnberg, Dept Chem & Pharm, Chair Organ Chem 1, D-91054 Erlangen, Germany;

    Univ Bayreuth, Expt Phys 4, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany;

    Univ Bayreuth, Macromol Chem 1, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Ctr Colloids & Interfaces, D-95440 Bayreuth, Germany;

    Univ Bayreuth, Expt Phys 4, D-95440 Bayreuth, Germany|Univ Bayreuth, Bayreuth Inst Macromol Res, D-95440 Bayreuth, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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