Shape-Pure, Nearly Monodispersed CsPbBr3 Nanocubes Prepared Using Secondary Aliphatic Amines,Nano Letters

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Shape-Pure, Nearly Monodispersed CsPbBr3 Nanocubes Prepared Using Secondary Aliphatic Amines
Nano Letters ( IF 9.6 ) Pub Date : 2018-11-01 00:00:00 , DOI: 10.1021/acs.nanolett.8b03598
Muhammad Imran ₁ , Palvasha Ijaz ₁ , Dmitry Baranov , Luca Goldoni , Urko Petralanda , Quinten Akkerman ₁ , Ahmed L. Abdelhady , Mirko Prato , Paolo Bianchini , Ivan Infante ₂ , Liberato Manna

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Fully inorganic cesium lead halide perovskite (CsPbX₃) nanocrystals (NCs) have been extensively studied due to their excellent optical properties, especially their high photoluminescence quantum yield (PLQY) and the ease with which the PL can be tuned across the visible spectrum. So far, most strategies for synthesizing CsPbX₃ NCs are highly sensitive to the processing conditions and ligand combinations. For example, in the synthesis of nanocubes of different sizes, it is not uncommon to have samples that contain various other shapes, such as nanoplatelets and nanosheets. Here, we report a new colloidal synthesis method for preparing shape-pure and nearly monodispersed CsPbBr₃ nanocubes using secondary amines. Regardless of the length of the alkyl chains, the oleic acid concentration, and the reaction temperature, only cube-shaped NCs were obtained. The shape purity and narrow size distribution of the nanocubes are evident from their sharp excitonic features and their ease of self-assembly in superlattices, reaching lateral dimensions of up to 50 μm. We attribute this excellent shape and phase purity to the inability of secondary amines to find the right steric conditions at the surface of the NCs, which consequently limits the formation of low-dimensional structures. Furthermore, no contamination from other phases was observed, not even from Cs₄PbBr₆, presumably due to the poor ability of secondary aliphatic amines to coordinate to PbBr₂ and, hence, to provide a reaction environment that is depleted in Pb.

中文翻译：

使用仲脂肪族胺制备的纯形状，几乎单分散的CsPbBr ₃纳米立方体

完全无机卤化铯铅钙钛矿（CsPbX ₃）纳米晶体（NCs）由于其出色的光学性能，尤其是其高的光致发光量子产率（PLQY）以及可以在可见光谱范围内轻松调谐的特性，已经得到了广泛的研究。到目前为止，大多数合成CsPbX ₃ NC的策略对加工条件和配体组合高度敏感。例如，在合成不同大小的纳米立方体时，具有包含各种其他形状的样品（例如纳米片和纳米片）的情况并不少见。在这里，我们报告了一种新的胶体合成方法，用于制备形状纯净且几乎单分散的CsPbBr ₃使用仲胺的纳米立方体。不管烷基链的长度，油酸浓度和反应温度如何，都只能得到立方体形状的NC。纳米立方的形状纯度和狭窄的尺寸分布从其尖锐的激子特征以及在超晶格中易于自组装（达到最大50μm的横向尺寸）中可以明显看出。我们将这种优异的形状和相纯度归因于仲胺无法在NC的表面上找到正确的空间条件，从而限制了低维结构的形成。此外，未观察到其他相的污染，甚至没有观察到Cs ₄ PbBr _6的污染，这可能是由于仲脂族胺与PbBr ₂配位的能力较弱所致。因此，提供了一种贫铅的反应环境。

更新日期：2018-11-01

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