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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

629
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
629
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

1.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.1K
Precipitation Processes01:12

Precipitation Processes

494
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
494
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

2.2K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.2K
Types of Coprecipitation01:10

Types of Coprecipitation

670
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
670

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Updated: Jul 25, 2025

Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Colloid driven low supersaturation crystallization for atomically thin Bismuth halide perovskite.

Lutao Li1, Junjie Yao1, Juntong Zhu1

  • 1College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006, China.

Nature Communications
|June 23, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel crystallization method to grow atomically thin cesium bismuth bromide (Cs3Bi2Br9) perovskites. This technique overcomes challenges associated with strong electronic coupling, enabling controlled growth of layered structures for advanced optical applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Growing atomically thin non-van der Waals perovskites is difficult due to strong interlayer electronic coupling.
  • Existing methods struggle to achieve controlled growth of layered perovskite structures.

Purpose of the Study:

  • To develop a new strategy for growing atomically thin halide perovskites with non-van der Waals structures.
  • To investigate the layer-dependent properties of these ultrathin perovskites.

Main Methods:

  • A colloid-driven, low supersaturation crystallization strategy was employed.
  • Surfactant adsorption on specific crystal facets promoted anisotropic, planar growth.
  • Controlled growth of Cs3Bi2Br9 from monolayer to six-layered structures was achieved.

Main Results:

  • Atomically thin Cs3Bi2Br9 (0.7–5.7 nm) was successfully synthesized.
  • Layer-dependent nonlinear optical performance was observed.
  • Stacking-induced second harmonic generation was demonstrated.

Conclusions:

  • The colloid-driven crystallization method offers a viable approach for producing ultrathin non-van der Waals perovskites.
  • These materials exhibit unique optical properties dependent on their layer thickness.
  • This work opens avenues for applications requiring atomically thin single crystals with strong electronic coupling.