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Growth of ordered C-60 islands on TiO2(110)

机译:在TiO2(110)上生长有序C-60岛

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摘要

Non-contact atomic force microscopy is used to study C-60 molecules deposited on the rutile TiO2(110) surface in situ at room temperature. At submonolayer coverages, molecules adsorb preferentially at substrate step edges. Upon increasing coverage, ordered islands grow from the decorated step edges onto the lower terraces. Simultaneous imaging of bridging oxygen rows of the substrate and the C-60 island structure reveals that the C-60 molecules arrange themselves in a centered rectangular superstructure, with the molecules lying centered in the troughs formed by the bridging oxygen rows. Although the TiO2(110) surface exhibits a high density of surface defects, the observed C-60 islands are of high order. This indicates that the C-60 intermolecular interaction dominates over the molecule-substrate interactions that may cause structural perturbations on a defective surface. Slightly protruding C-60 strands on the islands are attributed to anti-phase boundaries due to stacking faults resulting from two islands growing together.
机译:非接触原子力显微镜用于研究室温下原位沉积在金红石型TiO2(110)表面的C-60分子。在亚单层覆盖范围内,分子优先吸附在基底台阶边缘。随着覆盖范围的增加,有序的岛屿将从装饰的台阶边缘生长到较低的露台上。衬底的桥接氧行和C-60岛结构的同时成像显示,C-60分子以中心矩形上部结构排列,分子居中位于桥接氧行形成的谷中。尽管TiO2(110)表面表现出高密度的表面缺陷,但观察到的C-60岛却是高阶的。这表明C-60的分子间相互作用在分子-底物相互作用上占主导地位,而分子-底物相互作用可能导致缺陷表面上的结构扰动。岛上略微突出的C-60链归因于两个边界一起生长导致的堆垛层错所致的反相边界。

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