Preparation of Water‐Soluble CsPbBr₃ Perovskite Quantum Dot Nanocomposites via Encapsulation into Amphiphilic Copolymers

Abstract

Water-dispersible and stable fluorescent CsPbBr 3 perovskite quantum dots (QDs)-loaded polymeric nanospheres were prepared by an emulsification process. Colloidal CsPbBr 3 QDs that were initially prepared in organic solvents were transferred to an aqueous solution by coating with non-ionic amphiphilic polymers, viz., poly(ethyleneoxide)-poly(propyleneoxide)-poly (ethyleneoxide) triblock-copolymer and polyethylene glycolylated hydrogenated castor oil. The polymer-encapsulated CsPbBr 3 QDs-loaded nanospheres have an average diameter of ∼ 55 nm and they disperse well in aqueous solutions without aggregation or flocculation. The fabricated CsPbBr 3 QDs-loaded nanospheres retain their luminescence properties in pure and salt-containing water, which indicates that the polymeric shell of the QDs-polymer nanospheres effectively blocks the diffusion of water and ions into the nanospheres. The results of this study might open many new possibilities for the fluorescent cesium lead halide QDs in a wide variety of applications; for example, they can serve as fluorescent bio-imaging probes.[a] S.

Core/Shell Metal Halide Perovskite Nanocrystals for Optoelectronic Applications

“…Reproduced with permission. [ 82 ] Copyright 2018, Wiley‐VCH. b) Synthetic procedures used to develop (step 1) red fluorescence CsPbBr 3 NCs, (step 2) water‐soluble PS‐PEB‐PS and PEG‐PPG‐PEG coated CsPbBr 3 NCs.…”

“…In situ encapsulation of perovskite NCs in a polymer shell provides another route to synthesize highly stable perovskite NCs. [42,71,[129][130][131][132] Lee et al [82] developed an emulsificationsolvent evaporation strategy to coat CsPbBr 3 NCs with poly(ethyleneoxide)-poly(propyleneoxide)-poly(ethyleneoxide) triblock-copolymer (poloxamer 127) and polyethylene glycolylated hydrogenated castor oil (PEG (15)-hydroxystearates) (Figure 9a). In this synthesis, a phase transfer agent of poloxamer 127 was used to facilitate the nucleation of CsPbBr 3 during the emulsification process.…”

“…Figure 9. a) Schematic illustration of the encapsulation of hydrophobic CsPbBr 3 NCs in amphiphilic polymers to render them water-soluble. Reproduced with permission [82]. Copyright 2018, Wiley-VCH.…”

Recent Progress in CsPbX3 Perovskite Nanocrystals for Enhanced Stability and Photocatalytic Applications

“…Encapsulation of CsPbX 3 perovskite in shell structure materials such as silica, [82–85] Aluminum Oxide, [86] TiO 2 , [87,88] Polymer Matrices, [89–92] Metal Organic Framework (MOF) [93–97] etc. can help to i).…”

Ultrafast Responsive Non‐Volatile Flash Photomemory via Spatially Addressable Perovskite/Block Copolymer Composite Film

“…[ 22–26 ] The one‐step solution process for generating arrays of nanostructure makes this approach amenable to the field of non‐volatile memory due to the high charge‐storage capacity and permanent storage capability. [ 25–27 ] However, even though the spatially defined perovskite nanostructure through selectively noncovalent bond to one segment of block copolymers has attracted widespread interest, especially in the field of photo‐physic and LED application, [ 28–33 ] the morphological effects of block copolymer/perovskite composite film on the photo‐responsive characteristics of non‐volatile flash photomemory remain undeveloped.…”