MoS2 Hybrid Nanostructures: From Octahedral to Quasi-Spherical Shells within Individual Nanoparticles
MoS2 Hybrid Nanostructures: From Octahedral to Quasi-Spherical Shells within Individual Nanoparticles
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DOI：
10.1002/anie.201006719
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发表时间：
2011-01-01
影响因子：
16.6
通讯作者：
Gordon, Jeffrey M.
中科院分区：
文献类型：
--
作者：
Albu-Yaron, Ana;Levy, Moshe;Gordon, Jeffrey M.
MoS 2是一种具有摩擦学和催化应用的层状化合物，已知可形成一系列中空封闭纳米结构[1-5]和纳米颗粒，包括石墨烯样结构。[6]这些已经通过高温合成和脉冲激光烧蚀（PLA）实验证明，并在理论上与量子化学计算。最小允许的结构是3至8 nm尺寸的纳米八面体。与碳富勒烯类似，它们被称为“真正的无机富勒烯”，[4]它们在形态和预测的电子性质方面都不同于更大的多壁MoS 2富勒烯样纳米颗粒。较大的类富勒烯颗粒是准球形（多面体）或纳米管，通常直径为20至150 nm。[3]在尺寸超过几百nm时，这些纳米颗粒转变成2 H-MoS 2片晶。富勒烯类颗粒已被认为是具有许多商业应用的上级固体润滑剂[7]，并且MoS 2纳米八面体可具有催化应用。了解这两种形态的基本共性可能在新材料的开发中被证明是必不可少的。对最小尺寸（直径< 10 nm）的中空二硫化钼纳米结构的研究始于1993年，当时第一个独立的建议是形成六个菱形的二硫化钼[3，5]（和BN）[8]的纳米八面体。在1999年，它被证明[4]，两个到四个壁的二硫化钼纳米八面体，3-5纳米的大小和高达约。104个原子，可以通过PLA获得。随后在参考文献中报告了类似的结果。[1，2]如图1a所示。最近对高能量密度方法（如激光烧蚀和电弧放电）的研究[9-13]导致了只有有限数量原子的小结构：Mo-S簇或双壁纳米八面体。
MoS2, a layered compound with tribological and catalytic applications, is known to form a range of hollow closed nanostructures [1–5] and nanoparticles, including graphene-like structures.[6] These have been demonstrated experimentally through high-temperature synthesis and pulsed laser ablation (PLA), and theoretically with quantum chemical calculations. The smallest allowed structures are nanooctahedra of 3 to 8nm size. Nicknamed the “true inorganic fullerene” in analogy to carbon fullerenes,[4] they differ from larger multiwalled MoS2 fullerene-like nanoparticles both in their morphology and predicted electronic properties. The larger fullerene-like particles are quasi-spherical (polyhedral) or nanotubular, typically with diameters of 20 to 150nm.[3] Above a few hundred nm in size, these nanoparticles transform into 2H-MoS2 platelets. Fullerene-like particles have been recognized as superior solid lubricants [7] with numerous commercial applications, and MoS2 nanooctahedra may have catalytic applications. Understanding the fundamental commonality of these two morphologies might prove essential in the development of new materials.The research on hollow MoS2 nanostructures of minimal size (< 10 nm in diameter) was initiated in 1993 upon the first independent proposal of the formation of nanooctahedra of MoS2 [3, 5](and BN)[8] with six rhombi in their corners. In 1999, it was demonstrated [4] that two-to four-walled MoS2 nanooctahedra, 3–5 nm in size and up to ca. 104 atoms, could be obtained by PLA. Similar results were subsequently reported in Ref.[1, 2] as illustrated in Figure 1 a. Recent studies of high energy density methods such as laser ablation and arc–discharge [9–13] resulted in small structures with only a limited number of atoms: Mo–S clusters or double-walled nanooctahedra.