Size-dependent structure of MoS2 nanocrystals
Size-dependent structure of MoS2 nanocrystals
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DOI：
10.1038/nnano.2006.171
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发表时间：
2007-01-01
影响因子：
38.3
通讯作者：
Besenbacher, Flemming
中科院分区：
文献类型：
--
作者：
Lauritsen, Jeppe V.;Kibsgaard, Jakob;Besenbacher, Flemming
二硫化钼的纳米结构是感兴趣的各种各样的纳米技术的应用，从潜在的使用无机纳米管在纳米电子学的纳米粒子在多相催化的积极使用。在这里，我们使用原子分辨扫描隧道显微镜系统地映射和分类的三角形二硫化钼纳米晶体的原子尺度结构的大小的函数。而不是一个平滑的变化，预期从块状结构的二硫化钼，我们观察到一个非常强的尺寸依赖性的簇形态和电子结构的趋势，以优化硫过剩存在于簇边缘。通过分析原子尺度的结构的集群，我们确定的起源发生在独特的集群大小的结构转变。新的发现表明，在二硫化钼纳米结构的合成过程中，良好的尺寸控制可用于生产具有上级性能的化学或光学活性的二硫化钼纳米材料。
Molybdenum disulphide nanostructures are of interest for a wide variety of nanotechnological applications ranging from the potential use of inorganic nanotubes in nanoelectronics to the active use of nanoparticles in heterogeneous catalysis. Here, we use atom-resolved scanning tunnelling microscopy to systematically map and classify the atomic-scale structure of triangular MoS2 nanocrystals as a function of size. Instead of a smooth variation as expected from the bulk structure of MoS2, we observe a very strong size dependence for the cluster morphology and electronic structure driven by the tendency to optimize the sulphur excess present at the cluster edges. By analysing of the atomic-scale structure of clusters, we identify the origin of the structural transitions occurring at unique cluster sizes. The novel findings suggest that good size control during the synthesis of MoS2 nanostructures may be used for the production of chemically or optically active MoS2 nanomaterials with superior performance.