Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria.
J Am Chem Soc. 2011 Mar 9;133(9):3056-62. doi: 10.1021/ja109729e. Epub 2011 Feb 10.
During the last years, self-assembled organic nanostructures have been recognized as a proper fundament for several electrical and optical applications. In particular, phenylenes deposited on muscovite mica have turned out to be an outstanding material combination. They tend to align parallel to each other forming needlelike structures. In that way, they provide the key for macroscopic highly polarized emission, waveguiding, and lasing. The resulting anisotropy has been interpreted so far by an induced dipole originating from the muscovite mica substrate. Based on a combined experimental and theoretical approach, we present an alternative growth model being able to explain molecular adsorption on sheet silicates in terms of molecule-surface interactions only. By a comprehensive comparison between experiments and simulations, we demonstrate that geometrical changes in the substrate surface or molecule lead to different molecular adsorption geometries and needle directions which can be predicted by our growth model.
在过去的几年中，自组装有机纳米结构已被认为是多种电气和光学应用的合适基础。特别是，沉积在白云母上的苯并菲已成为一种出色的材料组合。它们倾向于彼此平行排列，形成针状结构。这样，它们为宏观的高度偏振发射、波导和激光提供了关键。到目前为止，这种各向异性是通过来自白云母基底的诱导偶极子来解释的。基于实验和理论相结合的方法，我们提出了一种替代的生长模型，该模型仅根据分子-表面相互作用来解释层状硅酸盐上的分子吸附。通过实验和模拟之间的全面比较，我们证明了基底表面或分子的几何变化会导致不同的分子吸附几何形状和针状方向，这些都可以通过我们的生长模型来预测。
