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Benzoyl Versus Phenacyl Bromide: The Strategic Differences in Halide Perovskite Nanocrystals Design
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-04-03 , DOI: 10.1021/acsmaterialslett.3c00072 Suman Bera 1 , Rakesh Kumar Behera 1 , Sumit Kumar Dutta 1 , Narayan Pradhan 1
ACS Materials Letters ( IF 9.6 ) Pub Date : 2023-04-03 , DOI: 10.1021/acsmaterialslett.3c00072 Suman Bera 1 , Rakesh Kumar Behera 1 , Sumit Kumar Dutta 1 , Narayan Pradhan 1
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Facet engineering in nanocrystals is typically controlled by the surface atoms of the crystal and the interaction of interface binding ligands. This has been extensively studied for covalent chalcogenide nanocrystals, but little progress has been made for ionic halide perovskite nanocrystals. Stabilizing the different surface facets, mostly, determines the nature of the polyhedral shapes and also helps in understanding the formation of their anisotropic structures. Recent progresses of different polyhedral halide perovskite nanocrystals suggest that their formations are mostly reagent specific. Two halide reagents, benzoyl bromide and phenacyl bromide, which are only different in one −CH2– group, showed drastic difference in the shapes of resulting CsPbBr3 nanocrystals. While former resulted in the cube shape, the later triggered the formation of dodecahedron-shaped nanocrystals. Keeping this in mind, the chemical activities of these reagents for the shape evolution of binary and ternary metal halides and their conversion to halide perovskites with B-site ions introduction are investigated in detail and reported in this perspective. In addition, the cross exchanges in these two reagents and other possible pathways are also proposed for possible dimension tunable halide perovskite nanocrystals.
中文翻译：
苯甲酰与苯甲酰溴：卤化物钙钛矿纳米晶体设计的战略差异
纳米晶体中的刻面工程通常由晶体的表面原子和界面结合配体的相互作用控制。共价硫族化物纳米晶体已经广泛研究了这一点，但离子卤化物钙钛矿纳米晶体的研究进展甚微。稳定不同的表面面，主要决定了多面体形状的性质，也有助于理解其各向异性结构的形成。不同多面体卤化物钙钛矿纳米晶体的最新进展表明它们的形成主要是试剂特异性的。两种卤化物试剂，苯甲酰溴和苯甲酰溴，仅在一个 -CH 2 - 基团上不同，在所得 CsPbBr 3的形状上表现出巨大差异纳米晶体。前者导致立方体形状，后者引发十二面体形纳米晶体的形成。牢记这一点，这些试剂对二元和三元金属卤化物的形状演变及其转化为具有 B 位离子引入的卤化物钙钛矿的化学活性进行了详细研究，并从这个角度进行了报道。此外，还提出了这两种试剂的交叉交换和其他可能的途径，用于可能尺寸可调的卤化物钙钛矿纳米晶体。
更新日期：2023-04-03
中文翻译：
苯甲酰与苯甲酰溴：卤化物钙钛矿纳米晶体设计的战略差异
纳米晶体中的刻面工程通常由晶体的表面原子和界面结合配体的相互作用控制。共价硫族化物纳米晶体已经广泛研究了这一点，但离子卤化物钙钛矿纳米晶体的研究进展甚微。稳定不同的表面面，主要决定了多面体形状的性质，也有助于理解其各向异性结构的形成。不同多面体卤化物钙钛矿纳米晶体的最新进展表明它们的形成主要是试剂特异性的。两种卤化物试剂，苯甲酰溴和苯甲酰溴，仅在一个 -CH 2 - 基团上不同，在所得 CsPbBr 3的形状上表现出巨大差异纳米晶体。前者导致立方体形状，后者引发十二面体形纳米晶体的形成。牢记这一点，这些试剂对二元和三元金属卤化物的形状演变及其转化为具有 B 位离子引入的卤化物钙钛矿的化学活性进行了详细研究，并从这个角度进行了报道。此外，还提出了这两种试剂的交叉交换和其他可能的途径，用于可能尺寸可调的卤化物钙钛矿纳米晶体。
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