【摘要】 本文利用扫描隧道显微镜研究了铜原子掺杂对于三聚氰胺分子在Au(111)表面自组装结构的调控作用.蒸镀到表面的铜原子稳定吸附在三聚氰胺分子中的氨基下方,并诱导三聚氰胺分子之间的氢键构型发生变化.三聚氰胺的组装结构也随着表面铜原子数量的增加而逐步由高对称性的蜂窝状结构转变成铁轨状结构及三角形结构.铜原子与三聚氰胺分子的作用并不太强,故而在受热至100℃时即随着分子的脱附而从组装中释放出来.该结果有别于以往文献中报道的由强配位键组成的配位组装及物理吸附的金属原子.因而可能提供一种利用分子组装调控表面金属原子催化活性的新方法.更多还原

【Abstract】 The doping effect of Cu on the self-assembly film of melamine on an Au(111) surface has been investigated with scanning tunneling microscopy(STM). The evaporated Cu adatoms occupy the positions underneath the amino groups and change the hydrogen bonding pattern between the melamine molecules. Accordingly, the self-assembly structure has changed stepwise from a well-defined honeycomb into a track-like and then a triangular structure depending on the amount of Cu adatoms. The interaction between Cu adatom and melamine is moderate thus the Cu adatoms can be released upon mild heating to around 100 ℃. These findings axe different from previous observations of either the coordination assembly or the physically trapped metal adatoms.更多还原