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Related Concept Videos

Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

18.6K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
18.6K
Metallic Solids02:37

Metallic Solids

19.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
19.6K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.5K
Colloidal precipitates01:09

Colloidal precipitates

1.3K
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...
1.3K
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

1.0K
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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Updated: Jun 23, 2026

Compact Quantum Dots for Single-molecule Imaging
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Published on: October 9, 2012

Core/Shell Magic-Sized CdSe Nanocrystals.

Andrew B Pun1, Aniket S Mule1, Jacob T Held1

  • 1Optical Materials Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Zurich 8092, Switzerland.

Nano Letters
|August 31, 2021
PubMed
Summary
This summary is machine-generated.

We developed core/shell semiconductor nanocrystals (MSNCs) with improved stability and photoluminescence. Thin CdS or CdZnS alloyed shells enhance emission properties, enabling atomically precise structures for advanced applications.

Keywords:
CdSe/CdS/ZnSatomically precisecore/shell nanocrystalsdiscrete growthmagic-sized clusters

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Dots

Background:

  • Magic-sized semiconductor nanocrystals (MSNCs) exhibit discrete size-dependent growth, offering potential for atomically precise structures.
  • Previous limitations included poor stability and trap-dominated photoluminescence, hindering their widespread application.

Purpose of the Study:

  • To enhance the stability and photoluminescence properties of larger-sized CdSe MSNCs.
  • To investigate the effects of shell growth on MSNC emissive characteristics.

Main Methods:

  • High-temperature synthesis was employed to grow cadmium sulfide (CdS) and cadmium zinc sulfide (CdZnS) alloy shells on cadmium selenide (CdSe) MSNC cores.
  • Characterization of the core/shell structures and their optical properties.

Main Results:

  • Thin CdS shells significantly improved photoluminescence quantum yields, narrowed fluorescence line widths, and eliminated trap emission.
  • CdZnS alloyed shells maintained efficient and narrow emission, with resulting crystallites showing a tetrahedral shape.
  • Thicker CdS shells resulted in decreased performance.

Conclusions:

  • Core/shell CdSe MSNCs with CdS or CdZnS shells demonstrate dramatically improved emissive properties and stability.
  • These findings suggest MSNCs can rival state-of-the-art semiconductor nanocrystals.
  • The developed core/shell structures provide a platform for further research into MSNCs and atomically precise growth.