Strong size selectivity in the self-assembly of rounded nanocubes into 3D mesocrystals.,Nanoscale Horizons

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Strong size selectivity in the self-assembly of rounded nanocubes into 3D mesocrystals.
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-06-15 , DOI: 10.1039/d0nh00117a
Elisabeth Josten ₁ , Manuel Angst , Artur Glavic , Paul Zakalek , Ulrich Rücker , Oliver H Seeck , András Kovács , Erik Wetterskog , Emmanuel Kentzinger , Rafal E Dunin-Borkowski , Lennart Bergström , Thomas Brückel

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The self-assembly of nanoparticles into highly ordered crystals is largely influenced by variations in the size and shape of the constituent particles, with crystallization generally not observed if their polydispersity is too large. Here, we report on size selectivity in the self-assembly of rounded cubic maghemite nanoparticles into three-dimensional mesocrystals. Different X-ray scattering techniques are used to study and compare a nanoparticle dispersion that is used later for self-assembly, an ensemble of mesocrystals grown on a substrate, as well as an individual mesocrystal. The individual μm-sized mesocrystal is isolated using a focused-ion-beam-based technique and investigated by the diffraction of a micro-focused X-ray beam. Structural analysis reveals that individual mesocrystals have a drastically smaller size dispersity of nanoparticles than that in the initial dispersion, implying very strong size selectivity during self-assembly. The small size dispersity of the nanoparticles within individual mesocrystals is accompanied by a very narrow lattice parameter distribution. In contrast, the lattice parameter distribution within all mesocrystals of an ensemble is about four times wider than that of individual mesocrystals, indicating significant size fractionalization between mesocrystals during self-assembly. The small size dispersity within each mesocrystal has important implications for their physical properties.

中文翻译：

在将圆形纳米立方体自组装为3D中观晶体时具有强大的尺寸选择性。

纳米粒子自组装成高度有序的晶体在很大程度上受组成粒子的尺寸和形状变化的影响，如果它们的多分散度太大，通常不会观察到结晶。在这里，我们报告圆形立方磁赤铁矿纳米粒子自组装成三维介晶的尺寸选择性。使用不同的X射线散射技术来研究和比较纳米粒子分散体，该分散体随后用于自组装，在衬底上生长的中间晶体的集合以及单个中间晶体。使用基于聚焦离子束的技术分离单个μm尺寸的介晶，并通过微聚焦X射线束的衍射进行研究。结构分析表明，单个介晶的纳米颗粒尺寸分散度比初始分散体要小得多，这意味着自组装过程中的尺寸选择性非常强。纳米粒子在单个介晶中的小尺寸分散性伴随着非常窄的晶格参数分布。相比之下，一个集合体的所有中观晶体中的晶格参数分布大约是单个中观晶体的四倍，这表明自组装过程中中观晶体之间存在明显的尺寸分级。每个介晶内的小尺寸分散度对其物理性质具有重要意义。纳米粒子在单个介晶中的小尺寸分散性伴随着非常窄的晶格参数分布。相比之下，一个集合体的所有中观晶体中的晶格参数分布大约是单个中观晶体的四倍，这表明自组装过程中中观晶体之间存在明显的尺寸分级。每个介晶内的小尺寸分散度对其物理性质具有重要意义。纳米粒子在各个介晶中的小尺寸分散性伴随着非常窄的晶格参数分布。相比之下，一个集合体的所有中观晶体中的晶格参数分布大约是单个中观晶体的四倍，这表明自组装过程中中观晶体之间存在明显的尺寸分级。每个介晶内的小尺寸分散度对其物理性质具有重要意义。

更新日期：2020-06-29

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