Liquid-on-solid heterogeneous nucleation for a general synthesis of yolk–shell nanostructures

Guo, Huajun; Wu, Zhouling; Wang, Ruoxu; Chen, Hongyu

doi:10.1039/d3cc01464a

Chem. Commun.

2023

DOI: 10.1039/d3cc01464a

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Liquid-on-solid heterogeneous nucleation for a general synthesis of yolk–shell nanostructures

Huajun Guo

Zhouling Wu

Ruoxu Wang

et al.

Abstract: Liquid-on-solid heterogeneous nucleation on solid nanoparticle seeds was achieved. Syrup solutions from a solute-induced phase separation (SIPS) process were heterogeneously nucleated on nanoparticle seeds to form syrup domains, similar to...

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2024

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CsPbBr₃ Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

Junisu,

Sun,

Septani

et al. 2024

ACS Appl. Nano Mater.

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We systematically investigated how block copolymer (BCP) templating influences CsPbBr 3 nanocrystals inside polystyrene-block-poly(2-vinylpyridine) (PS m -b-P2VP n ) micelles in benzene (BEN), toluene (TOL), oxylene (OXY), and 1,3,5trimethylbenzene (TMB) for light-emitting diode (LED) applications. Each organic solvent features a benzene ring attached to different numbers of methyl groups, thus providing varying solvent qualities for the formation of CsPbBr 3 nanocrystals. We found that solvent quality plays a crucial role in fabricating CsPbBr 3 nanocrystals with a superior photoluminescence (PL) performance and long-term stability. The micellization strength of PS m -b-P2VP n is strongest in TMB but weakest in BEN, suggesting that increasing the number of methyl groups attached to benzene enhances micellization. Furthermore, increasing the number of methyl groups attached to benzene also yields three positive effects: increased dissociation, complexation, and coordination interaction of PbBr 2 with P2VP cores. Consequently, each PS m -b-P2VP n micelle can capture a higher content of [PbBr 3 ] − complexes in TMB. Complexation of PbBr 2 followed by coordination interaction with P2VP is also critical because the growth of CsPbBr 3 nanocrystals inside individual micelles involves binding of Cs + cations with [PbBr 3 ] − complexes rather than with PbBr 2 nanocrystals. However, [PbBr 3 ] − complexes are not crystalline but amorphous and are not uniformly distributed within the P2VP cores. When a small amount of CsBr was added, a portion of [PbBr 3 ] − complexes transformed to form CsPbBr 3 perovskite nanocrystals (PNCs) with small size and polydisperse size distribution, coexisting with abundant active [PbBr 3 ] − and [PbBr 4 ] 2− complexes. Furthermore, variations in the molecular weights and compositions of PS m -b-P2VP n have minimal influence on the size of the CsPbBr 3 nanoparticles. Instead, the CsBr content plays a more decisive role in controlling nanoparticle size, primarily due to the limited solubility of CsBr, an all-inorganic precursor, in methanol.

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CsPbBr₃ Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

Junisu,

Sun,

Septani

et al. 2024

ACS Appl. Nano Mater.

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Liquid-on-solid heterogeneous nucleation for a general synthesis of yolk–shell nanostructures

Abstract: Liquid-on-solid heterogeneous nucleation on solid nanoparticle seeds was achieved. Syrup solutions from a solute-induced phase separation (SIPS) process were heterogeneously nucleated on nanoparticle seeds to form syrup domains, similar to...

Cited by 1 publication

References 21 publications

CsPbBr₃ Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

CsPbBr₃ Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

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Liquid-on-solid heterogeneous nucleation for a general synthesis of yolk–shell nanostructures

Abstract: Liquid-on-solid heterogeneous nucleation on solid nanoparticle seeds was achieved. Syrup solutions from a solute-induced phase separation (SIPS) process were heterogeneously nucleated on nanoparticle seeds to form syrup domains, similar to...

Cited by 1 publication

References 21 publications

CsPbBr3 Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

CsPbBr3 Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

Contact Info

Product

Resources

About

CsPbBr₃ Nanocrystals Prepared Using Block Copolymer Micelles for LEDs

CsPbBr₃ Nanocrystals Prepared Using Block Copolymer Micelles for LEDs