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首页> 外文期刊>Chemistry: A European journal >Self-Assembly of a Conjugated Polymer: From Molecular Rods to a Nanoribbon Architecture with Molecular Dimensions
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Self-Assembly of a Conjugated Polymer: From Molecular Rods to a Nanoribbon Architecture with Molecular Dimensions

机译：共轭聚合物的自组装：从分子棒到分子尺寸的纳米带结构。

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摘要

The growth from solution of novel end-functionalised poly(para-phenyleneethynylene)s (PPEs) on flat solid crystalline substrates was investigated. The macromolecular structure of PPE at the interface between the basal plane of graphite and an organic solution was visualised with molecular resolution by scanning tunneling microscopy. It revealed a two-dimensional nematic-like molecular order of the polydisperse polymer, while a corresponding shorter and monodisperse oligomer exhibited an epitaxial 2D crystl structure. In contrast, on the insulating substrate mica, PPE can self-assemble into micrometer-long nanoribbons. Their cross-section was determined quantitatively by scanning force microscopy in tapping mode; this revealed a typical thickness of two molecular layers and a width distribution that is well described by the distribution of molecular weights, according to the Schulz-Zimm distribution. This indicates that the polymers are fully extended in the ribbons and oriented with the conjugated backbone parallel to the substrate and perendicular to the long axis of the ribbons. Unlike previous studies carried out interfacing single moleucles ot metallic probes, we propose here functinalised ribbons as polymolecular architectures, which could be used to interconnect gold nanoelectrodes in a molecular-scale electronic device.
机译：研究了在平坦固体晶体基板上新型末端官能化聚对苯撑乙炔（PPE）溶液的​​生长。通过扫描隧道显微镜以分子分辨率观察在石墨的基面和有机溶液之间的界面上的PPE的大分子结构。它揭示了多分散聚合物的二维向列状分子序，而相应的较短和单分散的低聚物表现出外延二维Crystl结构。相反，在绝缘衬底云母上，PPE可以自组装成微米级的纳米带。通过扫描力显微镜在攻丝模式下定量测定其横截面。根据Schulz-Zimm分布，这揭示了两个分子层的典型厚度和宽度分布，分子量分布很好地描述了该分布。这表明聚合物在带中完全延伸，并与共轭骨架平行于基底并垂直于带的长轴取向。与先前进行的将单分子与金属探针连接的研究不同，我们在此提出将功能化的带状结构作为多分子体系结构，可将其用于在分子规模电子设备中互连金纳米电极。

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