Low-Temperature Scanning Tunneling Microscopy Investigation of Bis(phthalocyaninato)yttrium Growth on Au(111): From Individual Molecules to Two-Dimensional Domains
Low-Temperature Scanning Tunneling Microscopy Investigation of Bis(phthalocyaninato)yttrium Growth on Au(111): From Individual Molecules to Two-Dimensional Domains
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DOI：
10.1021/jp902410q
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发表时间：
2009-05
影响因子：
3.7
通讯作者：
Yanfeng Zhang;H. Isshiki;K. Katoh;Y. Yoshida;M. Yamashita;H. Miyasaka;B. Breedlove;T. Kajiwara
中科院分区：
文献类型：
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作者：
Yanfeng Zhang;H. Isshiki;K. Katoh;Y. Yoshida;M. Yamashita;H. Miyasaka;B. Breedlove;T. Kajiwara
我们展示了在金（111）基底上双层双（酞菁）钇（YPc₂；Pc = 酞菁）分子吸附的4.8 K扫描隧道显微镜（STM）观测结果。无论是在孤立状态还是在分子膜中，单个分子的亚分子STM对比都呈现出八瓣结构的图像。这一特征源于顶部的酞菁基团，其中四个苯环的两侧都被突显出来。作为孤立分子，其吸附取向由底部的酞菁决定，其对角轴平行于金（111）的密排方向排列。在二维膜中，出现了一个近方形的分子晶格，其单元约为1.47×1.38 nm²，并且其中一个晶格矢量从密排方向旋转了约15°。我们提供了一个初步模型来说明分子排列情况，其中相邻分子相互旋转了约30°。通过这种方式，底部的酞菁应该交替地沿着[101]和[211]方向（或其等效方向）排列。所有这些事实都说明了该分子……
We show a 4.8 K STM observation of a double-decker bis(phthalocyaninato)yttrium (YPc2; Pc = phthalocyanine) molecule adsorption on Au(111) substrate. An eight-lobed structure was imaged as the submolecule STM contrast of a single molecule both in an isolated state and in a molecule film. This feature arises from the top Pc group, where both sides of the four phenyl rings are highlighted. As an isolated molecule, the adsorption orientation is determined by the lower Pc, the diagonal axis of which aligns parallel to the close-packed direction of Au(111). In a 2D film, a near-square molecule lattice appears with a unit of ∼1.47 × 1.38 nm2, and one of the lattice vectors is rotated by ∼15° from the close-packed direction. A tentative model is provided to illustrate the molecule array where neighboring molecules are rotated by ∼30° from each other. In this way, the lower Pcs should align along the [101] and [211] directions (or their equivalent directions) alternately. All these facts illustrate the molecule...