Revealing Grain Boundaries and Defect Formation in Nanocrystal Superlattices by Nanodiffraction.
Revealing Grain Boundaries and Defect Formation in Nanocrystal Superlattices by Nanodiffraction.
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DOI：
10.1002/smll.201904954
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发表时间：
2019-04
期刊：
影响因子：
13.3
通讯作者：
N. Mukharamova;D. Lapkin;I. Zaluzhnyy;Alexander André;S. Lazarev;Young Yong Kim;M. Sprung;R. Kurta;F. Schreiber;I. Vartanyants;Marcus Scheele
中科院分区：
文献类型：
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作者：
N. Mukharamova;D. Lapkin;I. Zaluzhnyy;Alexander André;S. Lazarev;Young Yong Kim;M. Sprung;R. Kurta;F. Schreiber;I. Vartanyants;Marcus Scheele
利用X射线纳米衍射技术研究了面心立方结构PbS纳米晶介晶超晶格中畴界的形成及其相关性。超晶格的每个域可以用具有不同取向顺序的两种介晶多晶型物中的一种来描述。接近晶界，晶格常数减小，超晶格经历面外旋转，而纳米晶体相对于超晶格的取向保持不变。这些发现解释与特定的纳米晶-衬底相互作用的费用上的应力释放。发现相邻纳米晶体之间的相关性在大多数晶界处的结构变化中幸存下来的事实意味着具有宏观畴尺寸的超晶格的关键是与衬底的相互作用的加强。
X-ray nanodiffraction is applied to study the formation and correlation of domain boundaries in mesocrystalline superlattices of PbS nanocrystals with face-centered cubic structure. Each domain of the superlattice can be described with one of two mesocrystalline polymorphs with different orientational orders. Close to a grain boundary, the lattice constant decreases and the superlattice undergoes an out-of-plane rotation, while the orientation of the nanocrystals with respect to the superlattice remains unchanged. These findings are explained with the release of stress on the expense of specific nanocrystal-substrate interactions. The fact that correlations between adjacent nanocrystals are found to survive the structural changes at most grain boundaries implies that the key to nanocrystal superlattices with macroscopic domain sizes are strengthened interactions with the substrate.