Polyvinylpyrrolidone-assisted aqueous synthesis of monodisperse CH3NH3PbBr3 perovskite nanocrystals
Source abstract
Abstract
Metal halide perovskites are difficult to be prepared entirely in water due to their ionic nature. Aqueous synthesis routes of methylammonium lead bromide (CH3NH3PbBr3) perovskite were reported previously, but those methods failed to produce uniform perovskite nanocrystals. Here, monodisperse CH3NH3PbBr3 nanocrystals with an average size of 8.0 nm were directly obtained in an aqueous solution through adopting the hydrophilic polymer polyvinylpyrrolidone (PVP) as a capping ligand. It was revealed from the X-ray photoelectron and Fourier transform infrared spectra that strong chemical interactions occurred between the polymer lactam groups and the perovskite ions, which resulted in the restriction on crystal growth and the production of monodisperse nanocrystals. In addition, both the passivation and the protection of CH3NH3PbBr3 nanocrystals were effectively reached by the PVP macromolecules, endowing the perovskite nanocrystals with a high photoluminescence quantum yield and a long stability. This work presents an important progress in the pursuit of the environment-friendly and economical route for the synthesis of halide perovskite nanocrystals.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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