Institute of Experimental Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria.
Phys Chem Chem Phys. 2010 Apr 7;12(13):3141-4. doi: 10.1039/b922285e. Epub 2010 Feb 10.
The thickness dependent optical and electronic structure of para-sexiphenyl thin films grown on TiO(2)(110) at around 400 K reveals that the substrate is first wet by one monolayer of molecules lying with their long axis parallel to the [001] direction of the substrate, while the molecules in subsequent layers are almost standing upright. Whilst ultraviolet photoemission spectroscopy (UPS) is sensitive to the molecules in the outermost layer, reflection difference spectroscopy (RDS) shows that the molecules at the buried interface do not dewet and maintain the orientation of the original wetting monolayer.
在约 400 K 下于 TiO(2)(110) 上生长的 para-sexiphenyl 薄膜的厚度依赖性光学和电子结构表明，衬底首先被一层与其长轴平行于[001]方向的分子单层润湿，而后续层中的分子几乎垂直站立。虽然紫外光电子能谱（UPS）对最外层的分子敏感，但反射差光谱（RDS）表明埋入界面处的分子不会去湿并保持原始润湿单层的取向。
