完全有序的全同金属纳米点阵列的生长与研究

Spontaneous Fabrication of Periodic Arrays of Identical Metal Nano-clusters

        贾金锋(物理研究所表面物理国家重点实验室中国科学院国际量子结构中心)
        薛其坤(物理研究所表面物理国家重点实验室中国科学院国际量子结构中心)
        张绳百(美国再生能源国家实验室)

         纳米团簇;硅;扫描隧道显微镜;第一性原理计算

        利用“幻数稳定团簇+模板”方法在半导体Si(111)衬底上第一次成功地外延生长出了尺寸相同、空间分布均匀的金属纳米团簇阵列。这种方法适用于不同的金属,制备出的纳米团簇阵列热稳定性非常高。用扫描隧道显微镜(STM)原位分析结合第一性原理计算确定了纳米团簇的原子结构以及阵列的形成机理。

        Periodic two-dimensional arrays of identical metal clusters of nanometer size and spacing were successfully fabricated on Si(111) substrate by molecule beam epitaxy. The method we propose is based on surface mediated clustering on a periodic template. The versatility of the method is demonstrated for a broad range of metals on Si(111)-7×7 substrates and the nano-dot arrays are stable up to 200°C. In situ scanning tunneling microscopy analysis of In clusters, combined with first-principles total energy calculations, unveils unique initial-stage atomic structures of the surface-supported clusters and the vital steps that lead to the success of this method.