Structural Properties of Self-Organized Organo-Silicon Macromolecular Films Investigated by Scanning Tunneling Microscopy and X-ray Diffraction
Structural Properties of Self-Organized Organo-Silicon Macromolecular Films Investigated by Scanning Tunneling Microscopy and X-ray Diffraction
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通过扫描隧道显微镜和 X 射线衍射研究自组织有机硅高分子薄膜的结构特性
DOI：
10.1021/jp993167r
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发表时间：
2000
影响因子：
3.3
通讯作者：
K. Harris
中科院分区：
文献类型：
--
作者：
P. Miao;A. W. Robinson;R. Palmer;B. M. K. and;K. Harris
用扫描隧道显微镜(STM)和扫描隧道谱(STS)研究了含硅大分子二氯化硅(SiPcCl2)从溶液中沉积在氢钝化的Si(111)表面上的薄膜。在高覆盖率薄膜中，观察到尺寸约为5.5 nm×4.5 nm的团簇。这些星团被认为部分堆叠在一起，这表明表面层的生长机制是倾斜的。在低覆盖率的薄膜中，发现了有序的单分子膜，其结构与SiPcCl2的体晶体结构非常相似。在这项工作中，用蒙特卡罗方法直接从粉末X射线衍射数据确定了SiPcCl2的大块晶体结构。扫描隧道显微镜分析和在Si(111)表面观察到有序的SiPcCl2层的结果表明，SiPcCl2分子与衬底之间的相互作用弱于SiPcCl2分子之间的相互作用。STS测量显示，Beha正在纠正。
Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) have been applied to investigate thin films of a model silicon-containing macromolecule, silicon phthalocyanine dichloride (SiPcCl2), deposited from solution on to the H-passivated Si(111) surface. In a high coverage film, clusters of about 5.5 nm × 4.5 nm in size are observed. These clusters are believed to partially stack on each other, suggesting a tilted growth mechanism of the layers on the surface. In a low coverage film, well-ordered monolayers are found, with a close structural similarity to the bulk crystal structure of SiPcCl2. In this work, the bulk crystal structure of SiPcCl2 was determined directly from powder X-ray diffraction data using the Monte Carlo method. The results of STM manipulation and the observation of well-ordered SiPcCl2 layers on the Si(111) surface indicate a weaker interaction between the SiPcCl2 molecules and the substrate than between the SiPcCl2 molecules. STS measurements show rectifying beha...