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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Atom By Atom: Hrtem Insights Into Inorganic Nanotubes And Fullerene-like Structures
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Atom By Atom: Hrtem Insights Into Inorganic Nanotubes And Fullerene-like Structures

机译：Atom by Atom：Hrtem洞悉无机纳米管和富勒烯样结构

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摘要

The characterization of nanostructures down to the atomic scale is essential to understand some physical properties. Such a characterization is possible today using direct imaging methods such as aberration-corrected high-resolution transmission electron microscopy (HRTEM), when iteratively backed by advanced modeling produced by theoretical structure calculations and image calculations. Aberration-corrected HRTEM is therefore extremely useful for investigating low-dimensional structures, such as inorganic fullerene-like particles and inorganic nanotubes. The atomic arrangement in these nanostructures can lead to new insights into the growth mechanism or physical properties, where imminent commercial applications are unfolding. This article will focus on two structures that are symmetric and reproducible. The first structure that will be dealt with is the smallest stable symmetric closed-cage structure in the inorganic system, a MoS_2 nanoocta-hedron. It is investigated by means of aberration-corrected microscopy which allowed validating the suggested DFTB-MD model. It will be shown that structures diverging from the energetically most stable structures are present in the laser ablated soot and that the alignment of the different shells is parallel, unlike the bulk material where the alignment is antiparallel. These findings correspond well with the high-energy synthetic route and they provide more insight into the growth mechanism. The second structure studied is WS_2 nanotubes, which have already been shown to have a unique structure with very desirable mechanical properties. The joint HRTEM study combined with modeling reveals new information regarding the chirality of the different shells and provides a better understanding of their growth mechanism.
机译：直至原子尺度的纳米结构表征对于理解某些物理性质都是必不可少的。今天，当通过理论结构计算和图像计算产生的高级建模迭代支持时，可以使用直接成像方法（如像差校正的高分辨率透射电子显微镜（HRTEM））进行这种表征。因此，像差校正后的HRTEM对于研究低维结构（如类无机富勒烯颗粒和无机纳米管）非常有用。这些纳米结构中的原子排列可导致对增长机制或物理性质的新见解，而即将到来的商业应用正在不断发展。本文将重点介绍两个对称且可重现的结构。将要处理的第一个结构是无机系统中最小的稳定对称闭笼结构，即MoS_2纳米八面体。通过像差校正显微镜对其进行了研究，该方法可以验证建议的DFTB-MD模型。将显示出与能量最稳定的结构不同的结构存在于激光烧成的烟灰中，并且不同的壳的排列是平行的，这与散装材料的排列是反平行的不同。这些发现与高能合成途径非常吻合，它们为生长机理提供了更多见识。研究的第二种结构是WS_2纳米管，它已显示具有独特的结构，具有非常理想的机械性能。 HRTEM联合研究与建模相结合，揭示了有关不同壳的手性的新信息，并提供了对其生长机理的更好理解。

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