谢尔宾斯基三角分形结构的STM研究

发布时间：2018-07-03 12:31

本文选题：分形 + 谢尔宾斯基三角形　；参考：《物理化学学报》2016年01期

【摘要】：分形结构因其特殊的数学和美学意义受到科学家们长期以来的广泛关注。化学家更是试图利用共价键和配位键等来合成各类分子分形结构,但由于溶解性的限制,始终无法实现高级别、无缺陷的分子分形结构的构筑。最近我们采用超高真空表面制备方法,成功获得了基于卤键与配位键的谢尔宾斯基三角分形结构,并使用扫描隧道显微镜(STM)对其生长机制进行了研究。4,4′′′-二溴-1,1′:3′,1′′:4′′,1′′′-四联苯分子在Ag(111)表面通过自组装形成了一系列无缺陷卤键分形结构。由于卤键作用较弱,该结构只能稳定在液氮温度以下。在Au(111)表面共沉积4,4′′-二氰基-1,1′:3′,1′′-三联苯分子与铁原子可以制备出更稳定的配位分形结构。密度泛函理论计算揭示了分形结构的成像机制。蒙特卡洛计算表明,表面三节点的形成对谢尔宾斯基三角分形结构的生长具有重要意义。
[Abstract]:Because of its special mathematical and aesthetic significance, fractal structure has been widely concerned by scientists for a long time. Chemists try to use covalent bonds and coordination bonds to synthesize all kinds of molecular fractal structures. However, due to the solubility constraints, it is impossible to construct high-level, non-defective molecular fractal structures. Recently, we successfully obtained the Schelbinski triangular fractal structure based on the halogen bond and the coordination bond by using the ultra-high vacuum surface preparation method. The growth mechanism was studied by scanning tunneling microscope (STM). A series of non-defect halogen bond fractal structures were formed by self-assembly of the molecule of tetrabiphenyl on Ag (111) surface by means of scanning tunneling microscope (STM). The growth mechanism of the molecule was studied by means of scanning tunneling microscope (STM). The growth mechanism of the molecule was investigated by scanning tunneling microscope (STM). Because of the weak effect of halogen bond, the structure can only be stabilized below liquid nitrogen temperature. A more stable coordination fractal structure can be prepared by co-deposition of 4 ~ 4 ~ (4) -dicyano-1 ~ (- 1) -dicyano-1 ~ (-1)-1: 3 ~ (-1) -triphenyl molecule on au (111) surface with iron atoms, and a more stable coordination fractal structure can be obtained by the deposition of 4U (111). Density functional theory (DFT) calculation reveals the imaging mechanism of fractal structure. Monte Carlo calculations show that the formation of three nodes on the surface is of great significance to the growth of the Schelbinski triangular fractal structure.
【作者单位】：北京大学电子系纳米器件物理与化学教育部重点实验室;北京大学(天津滨海)新一代信息技术研究院;北京大学化学与分子工程学院北京分子科学国家实验室;
【基金】：国家自然科学基金(21522301,21373020,21403008,61321001,21433011,21133001,913000002) 国家重点基础研究发展规划项目(973)(2014CB239302,2013CB933404,2011CB808702) 高等学校博士学科点专项科研基金(20130001110029)资助~~
【分类号】：O641

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