DOI: https://doi.org/10.29363/nanoge.incnc.2021.043
Publication date: 8th June 2021
The past several years witnessed an explosion of chemical preparation methods dedicated to the synthesis of CsPbBr3 perovskite nanocrystals. In contrast, the methods of making CsPbBr3-based nanoheterostructures are scarce. In this contribution, we will discuss non-perovskite zero-dimensional metal halide Cs4PbBr6 as a precursor for CsPbBr3-Cs4PbBr6 and CsPbBr3-SiO2 nanoheterostructures. Upon addition of an organic anhydride to the colloidal dispersion of oleylammonium/oleate-capped Cs4PbBr6 nanocrystals, the amine-anhydride condensation reaction takes place. That reaction destabilizes the surface of Cs4PbBr6 nanocrystals, produces maleamic acid derivatives, and results in the Cs4PbBr6 to CsPbBr3 transformation. If a small molecule reactive anhydride is used for the condensation, the transformation happens fast and results in the acidic conditions suitable for hydrolysis of alkoxysilanes and overcoating of the resulting CsPbBr3 nanocrystals with a shell of amorphous silica. If a macromolecular anhydride is used for the condensation, the transformation takes time at room temperature, allowing to capture CsPbBr3-Cs4PbBr6 nanoheterostructures and characterize them with electron microscopy and optical spectroscopy. More generally, the anhydride-induced transformation of Cs4PbBr6 nanocrystals opens up a strategy for the chemical modification of metal halide NCs initially passivated with nucleophilic amines.
The discussed research is based on the results supported by various funding agencies that are acknowledged in the referenced publications.
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