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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...

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Updated: May 17, 2026

A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals
09:58

A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals

Published on: May 10, 2018

Core/shell colloidal semiconductor nanoplatelets.

Benoit Mahler1, Brice Nadal, Cecile Bouet

  • 1Laboratoire de Physique et d'Etude des Matériaux , CNRS, ESPCI, Paris, France.

Journal of the American Chemical Society
|October 13, 2012
PubMed
Summary
This summary is machine-generated.

Atomically flat semiconductor nanoplatelets were synthesized with conserved 2D geometry. These core/shell structures exhibit narrow emission spectra and high quantum yields, advancing nanomaterial applications.

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Colloidal nanoplatelets offer unique quantum confinement effects.
  • Achieving core/shell structures while preserving 2D geometry is challenging.

Purpose of the Study:

  • To synthesize atomically flat, core/shell semiconductor nanoplatelets with conserved 2D geometry.
  • To characterize the shell growth and its impact on the core structure.
  • To evaluate the optical properties of the resulting core/shell nanoplatelets.

Main Methods:

  • Epitaxial shell growth of semiconductor materials (CdSe/CdS, CdSe/CdZnS) at room temperature.
  • Spectroscopic and structural characterization techniques.
  • High-resolution, high-angle annular dark-field transmission electron microscopy (HAADF-TEM) for structural analysis.
  • Global phase analysis to study shell growth constraints.

Main Results:

  • Successful synthesis of core/shell nanoplatelets maintaining 2D geometry.
  • HAADF-TEM imaging clearly revealed core/shell interfaces with atomic plane counting for precise thickness determination.
  • Analysis of shell growth constraints on the core structure.
  • Obtained nanoplatelets with narrow emission spectra (FWHM ~20 nm) and high quantum yields (up to 60%).

Conclusions:

  • Atomically flat core/shell semiconductor nanoplatelets with conserved 2D geometry can be synthesized.
  • The developed method allows for precise control over shell thickness and core dimensions.
  • These core/shell nanoplatelets demonstrate excellent optical properties, suitable for advanced optoelectronic applications.