Super-Resolution Microscopy Reveals Shape and Distribution of Dislocations in Single-Crystal Nanocomposites
Super-Resolution Microscopy Reveals Shape and Distribution of Dislocations in Single-Crystal Nanocomposites
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超分辨率显微镜揭示单晶纳米复合材料中位错的形状和分布
DOI：
10.1002/ange.201905293
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发表时间：
2019
影响因子：
--
通讯作者：
Ihli J
中科院分区：
文献类型：
--
作者：
Ihli J
含有纳米颗粒的单晶具有提供新性能的潜力，提供了一类有吸引力的纳米复合材料。然而，为了充分利用这些，我们必须能够识别它们的3D结构，识别单个纳米颗粒的位置以及宿主晶体中存在的缺陷。使用含有量子点的方解石晶体作为模型系统，我们在这里使用3D随机光学重建显微镜（STORM）来定位宿主晶体内的纳米颗粒的位置。纳米粒子被证明优先与位错的方式以前公认的原子杂质，使这些缺陷可见的风暴。我们的图像还表明，在晶体/衬底界面处形成的位错的类型根据成核面而变化，并且观察到与经典失配位错具有完全不同的几何形状的位错环。这种方法提供了一种快速，易于访问和非破坏性的方法，用于可视化晶体内存在的位错，并深入了解添加剂在晶体内堵塞的机制。
With their potential to offer new properties, single crystals containing nanoparticles provide an attractive class of nanocomposite materials. However, to fully profit from these, it is essential that we can characterise their 3D structures, identifying the locations of individual nanoparticles, and the defects present within the host crystals. Using calcite crystals containing quantum dots as a model system, we here use 3D stochastic optical reconstruction microscopy (STORM) to locate the positions of the nanoparticles within the host crystal. The nanoparticles are shown to preferentially associate with dislocations in a manner previously recognised for atomic impurities, rendering these defects visible by STORM. Our images also demonstrate that the types of dislocations formed at the crystal/substrate interface vary according to the nucleation face, and dislocation loops are observed that have entirely different geometries to classic misfit dislocations. This approach offers a rapid, easily accessed, and non‐destructive method for visualising the dislocations present within crystals, and gives insight into the mechanisms by which additives become occluded within crystals.