Otero-Martínez Clara, García-Lojo Daniel, Pastoriza-Santos Isabel, Pérez-Juste Jorge, Polavarapu Lakshminarayana
Department of Physical Chemistry, CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Campus Universitario As Lagoas, Marcosende, 36310, Vigo, Spain.
Department of Physical Chemistry, CINBIO, Universidade de Vigo, Campus Universitario As Lagoas, Marcosende, 36310, Vigo, Spain.
Angew Chem Int Ed Engl. 2021 Dec 13;60(51):26677-26684. doi: 10.1002/anie.202109308. Epub 2021 Nov 15.
This work focuses on the systematic investigation of the shape, size, and composition-controlled synthesis of perovskite nanocrystals (NCs) under inert gas-free conditions and using pre-synthesized precursor stock solutions. In the case of CsPbBr NCs, we find that the lowering of reaction temperature from ∼175 to 100 °C initially leads to a change of morphology from bulk-like 3D nanocubes to 0D nanocubes with 3D-quantum confinement, while at temperatures below 100 °C the reaction yields 2D nanoplatelets (NPls) with 1D-quantum confinement. However, to our surprise, at higher temperatures (∼215 °C), the reaction yields CsPbBr hexapod NCs, which have been rarely reported. The synthesis is scalable, and their halide composition is tunable by simply using different combinations of precursor solutions. The versatility of the synthesis is demonstrated by applying it to relatively less explored shape-controlled synthesis of FAPbBr NCs. Despite the synthesis carried out in the air, both the inorganic and hybrid perovskite NCs exhibit nearly-narrow emission without applying any size-selective separation, and it is precisely tunable by controlling the reaction temperature.
这项工作专注于在无惰性气体条件下并使用预合成的前驱体储备溶液，对钙钛矿纳米晶体（NCs）的形状、尺寸和成分控制合成进行系统研究。对于CsPbBr NCs，我们发现反应温度从约175℃降至100℃时，最初会导致形态从块状3D纳米立方体转变为具有3D量子限制的0D纳米立方体，而在低于100℃的温度下，反应会生成具有1D量子限制的2D纳米片（NPls）。然而，令我们惊讶的是，在较高温度（约215℃）下，反应会生成很少被报道的CsPbBr六足NCs。该合成方法具有可扩展性，并且通过简单地使用前驱体溶液的不同组合，其卤化物组成是可调的。通过将其应用于相对较少探索的FAPbBr NCs形状控制合成，证明了该合成方法的多功能性。尽管合成是在空气中进行的，但无机和杂化钙钛矿NCs在不进行任何尺寸选择分离的情况下都表现出近乎窄的发射，并且通过控制反应温度可以精确调节发射。
