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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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...
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Updated: May 13, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Band structure quantization in nanometer sized ZnO clusters.

Koen Schouteden1, Yu-Jia Zeng, Koen Lauwaet

  • 1Laboratory of Solid-State Physics and Magnetism, KU Leuven, Celestijnenlaan 200d-box 2414, BE-3001 Leuven, Belgium. Koen.Schouteden@fys.kuleuven.be

Nanoscale
|March 22, 2013
PubMed
Summary
This summary is machine-generated.

Gas phase production of nanometer-sized zinc oxide (ZnO) clusters enables controlled fabrication of high-purity quantum dots. These quantum dots exhibit quantized energy levels due to finite-size effects, paving the way for novel heterostructures.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Zinc oxide (ZnO) clusters are synthesized in the gas phase.
  • These clusters are deposited onto gold (Au(111)) surfaces under ultra-high vacuum (UHV).

Purpose of the Study:

  • To characterize the atomic structure, electronic properties, and quantum confinement effects of ZnO clusters.
  • To explore the potential of gas phase cluster production for fabricating quantum dots and heterostructures.

Main Methods:

  • High-resolution scanning transmission electron microscopy (HR-STEM) for atomic structure resolution.
  • Scanning tunneling microscopy (STM) and spectroscopy (STS) at cryogenic temperatures for electronic property determination.
  • Ultra-high vacuum (UHV) deposition for controlled surface functionalization.

Main Results:

  • Spherical ZnO clusters with zinc blende structure were observed.
  • Individual clusters exhibit a large band gap and weak n-type conductivity.
  • Conduction bands show discrete energy level quantization, indicative of zero-dimensional confinement.

Conclusions:

  • Gas phase cluster production offers a method for controlled fabrication of size-selected, high-purity ZnO quantum dots.
  • This technique facilitates the creation of novel quantum dots and heterostructures on substrates under UHV conditions.