Donostia International Physics Center, Paseo Manuel Lardizabal 4, 20018 San Sebastián, Spain.
Phys Chem Chem Phys. 2009 Oct 21;11(39):8741-4. doi: 10.1039/b903116b. Epub 2009 Jul 24.
The structure of monolayer films of diindenoperylene (DIP) on Cu(111) single crystals has been studied by means of scanning tunneling microscopy (STM). Pronounced film confinement effects are observed, resulting in distinctly different film structures depending upon the substrate terrace width. On wide terraces (exceeding approximately 15 nm in width) a short range ordered structure forms with the DIP molecules aligned along three discrete directions related by 60 degrees rotations. On the contrary, on narrow terraces (<15 nm), the confinement enhances the role of the step edges and leads to the formation of a long range ordered structure with co-directionally oriented molecules, tentatively ascribed to an energy minimization by optimization of the surface coverage.
采用扫描隧道显微镜（STM）研究了二茚并对苯并菲（DIP）在 Cu(111)单晶表面单层膜的结构。实验观察到明显的膜受限效应，导致膜结构明显依赖于基底平台的宽度。在较宽的平台上（超过约 15nm），DIP 分子沿三个离散方向排列，这些方向通过 60 度旋转相关，形成短程有序结构。相反，在较窄的平台上（<15nm），受限增强了台阶边缘的作用，导致形成具有共取向分子的长程有序结构，该结构可以归因于通过优化表面覆盖率来实现能量最小化。
