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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(1 1 1 ) - 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
We propose a method of fabricating a two-dimensional periodic array of nano-metal clusters using a self-organized growth process using molecular beam epitaxy. The universality of this method is demonstrated by studying the group III elements, noble metals, magnetic metals and their alloy clusters grown on Si (1 1 1) - 7 × 7 substrates. Through the in-situ scanning tunneling microscope analysis and the first-principle total energy calculation of the In group lattice, we determined the unique atomic structures of these clusters and elucidated the formation mechanism of these structures. We find that the strong interaction between clusters and surfaces is the key to obtaining the specific size of clusters and their orderly arrangement