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Related Concept Videos

Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Crystalline superlattices from single-sized quantum dots.

Nanfeng Zheng1, Xianhui Bu, Haiwei Lu

  • 1Department of Chemistry, University of California, Riverside 92521, USA.

Journal of the American Chemical Society
|August 25, 2005
PubMed
Summary

Researchers synthesized cadmium sulfide (CdS) quantum dots, achieving the largest single-sized II-VI quantum dot to date with 138 metal-chalcogen sites. Further studies suggest even larger CdS quantum dots are possible.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Precise atomic control in semiconductor nanocrystal synthesis is challenging.
  • Monodisperse semiconducting nanocrystals are crucial for advanced applications.

Purpose of the Study:

  • To report the synthesis and characterization of cadmium sulfide (CdS) quantum dot superlattices.
  • To investigate the crystal structure and optical properties of these novel nanocrystal clusters.
  • To establish a new benchmark for the size of single-sized II-VI quantum dots.

Main Methods:

  • Synthesis of single-sized semiconducting clusters.
  • Single-crystal X-ray diffraction analysis to determine cluster size and structure.
  • X-ray powder diffraction (XRD) for larger cluster identification.
  • Optical absorption spectroscopy to study quantum dot properties.

Main Results:

  • Successfully synthesized CdS nanocrystal superlattices from single-sized clusters.
  • Determined the largest cluster to have 138 metal-chalcogen sites via single-crystal analysis.
  • Identified the largest known single-sized II-VI quantum dot (>100 metal-chalcogen sites).
  • Evidence from XRD and optical studies suggests the existence of even larger single-sized CdS quantum dots (>200 metal-chalcogen sites).
  • Clusters exhibit a cubic zinc blende core with hexagonal wurtzite corners.
  • Observed up to five isomeric forms based on hexagonal-cubic interface variations.

Conclusions:

  • Demonstrated a method to create large, single-sized II-VI quantum dots with controlled atomic composition.
  • The synthesized CdS quantum dots represent a significant advancement in nanocrystal size control.
  • The findings open avenues for exploring quantum dots with precisely engineered atomic structures and properties.