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首页> 外文期刊>Crystal growth & design >Heteroepitaxy of Organic Nanofibers: Example of Ternaphthalene on p?Hexaphenyl
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Heteroepitaxy of Organic Nanofibers: Example of Ternaphthalene on p?Hexaphenyl

机译：有机纳米纤维的异外延作用：对苯二酚上对苯的例子

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摘要

Nowadays heteroepitaxy is well understood and investigated for inorganic compounds. In contrast, the epitaxial growth of organic?organic multilayer structures is rarely reported. By a comprehensive comparison between experiments and simulations, we demonstrate that highly anisotropic, needle-shaped p-hexaphenyl (p-6P) crystallites can efficiently act as an organic template and that the epitaxial overgrowth by 2,2′:6′,2″-ternaphthalene (NNN) yields a high molecular order and optical anisotropy of the nucleated NNN crystallites. It is shown that surface corrugations formed by the p-6P template are responsible for a parallel molecular alignment and a geometrical adoption of the herringbone stacking sequence of NNN. On the basis of the obtained results, it can be concluded that, in contrast to inorganic heteroepitaxy, lattice matching plays a minor role, whereas a geometrical adoption of the molecular stacking is directly connected with an optimized adsorption energy. In that sense, polarization-dependent photoluminescence studies prove a significantly increased optical anisotropy of NNN crystallites, when a p-6P template layer is inserted between NNN and the muscovite mica substrate. The organic interlayer is also responsible for the formation of a different NNN contact plane and the suppression of islandshaped crystal morphologies which are a fingerprint for standing molecular configurations. Consequently, only highly anisotropic, lying molecular orientations are obtained, which is relevant for the design of future organic-based optoelectronic devices.
机译：如今，对于无机化合物而言，异位外加性已广为人知并进行了研究。相反，有机-有机多层结构的外延生长很少被报道。通过实验和模拟之间的全面比较，我们证明高度各向异性的针状对六苯基（p-6P）晶体可以有效地用作有机模板，并且外延过度生长2,2'：6'，2”萘（NNN）生成有核NNN晶体的高分子序和光学各向异性。结果表明，由p-6P模板形成的表面波纹负责NNN人字形堆叠序列的平行分子排列和几何结构采用。根据获得的结果，可以得出结论，与无机异质外延相反，晶格匹配起着较小的作用，而分子堆叠的几何采用与优化的吸附能直接相关。从这个意义上讲，当在NNN和白云母云母衬底之间插入p-6P模板层时，偏振相关的光致发光研究证明NNN晶体的光学各向异性显着增加。有机中间层还负责形成不同的NNN接触平面并抑制岛状晶体形态，这是站立分子构型的指纹。因此，仅获得高度各向异性的，平躺的分子取向，这与未来基于有机物的光电器件的设计有关。

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