全同周期排列的纳米团簇阵列的自发生长

我们提出了利用分子束外延的自组织生长过程大面积制备二维周期性纳米金属团簇阵列的一种方法.该方法的普适性通过研究 Si(111)-7×7衬底上生长的Ⅲ族元素、贵金属、磁性金属以及它们的合金团簇得到证实.通过对In团族点阵的原位扫描隧道显微镜分析和第一性原理总能量计算,我们确定了这些团簇独特的原子结构,阐明了这些结构的形成机理.我们发现团簇和表面之间的强相互作用是获得团簇的特定尺寸和其有序排列的关键所在.

Spontaneous fabrication of periodic identical nanocluster arrays by magic clustering process on nanostructured template

We propose a method by which periodic two dimensional arrays of identical metal clusters of nanometer size and spacing could be spontaneously obtainedby using standard molecular beam epitaxy. The versatility of this method is demonstrated for a broad range of metals such as group III (In and Ga), noble metal (Ag), magnetic metal (Mn and Co), and their alloys on silicon (111)-7×7 substrate. In situ scanning tunneling microscopy analysis of In clusters, combined with first principles total energy theoretical calculations, unveils unique initial stage atomic structures of the semiconductor surface supported clusters and the vital steps that lead to the success of this method. A strong interaction between the clusters and the surface holds the key to the observed cluster sizes, aswell as to the lattice type of the arrays.