Cuddy Martin J, Arkill Kenton P, Wang Zhi Wei, Komsa Hannu-Pekka, Krasheninnikov Arkady V, Palmer Richard E
Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.
Nanoscale. 2014 Nov 7;6(21):12463-9. doi: 10.1039/c4nr04317k.
Well defined MoS2 nanoparticles having a layered structure and abundant edges would be of considerable interest for applications including photocatalysis. We report the atomic structure of MoS2 size-selected clusters with mass in a range all the way from 50 to ∼2000 MoS2 units. The clusters were prepared by magnetron sputtering and gas condensation prior to size selection and soft landing on carbon supports. Aberration-corrected scanning transmission electron microscopy (STEM) in high-angle annular dark-field (HAADF) mode reveals a layered structure and Mo-Mo spacing similar to the bulk material. The mean number of layers in these lamellar clusters increases from one to three with increasing mass, consistent with density functional theory calculations of the balance between edge energies and interlayer binding.
具有层状结构和大量边缘的结构明确的二硫化钼纳米颗粒在包括光催化在内的应用中具有相当大的吸引力。我们报告了质量范围从50到约2000个二硫化钼单元的尺寸选择的二硫化钼团簇的原子结构。这些团簇在尺寸选择和软着陆到碳载体之前通过磁控溅射和气体冷凝制备。在高角度环形暗场（HAADF）模式下的像差校正扫描透射电子显微镜（STEM）揭示了类似于块状材料的层状结构和钼-钼间距。随着质量增加，这些层状团簇中的平均层数从一层增加到三层，这与边缘能量和层间结合之间平衡的密度泛函理论计算结果一致。
