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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.4K
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....
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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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...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Long live(d) CsPbBr3 superlattices: colloidal atomic layer deposition for structural stability.

Victoria Lapointe1, Philippe B Green2, Alexander N Chen2

  • 1Department of Chemistry and Biochemistry, Centre for NanoScience Research, Concordia University 7141 Sherbrooke Street West Montreal Quebec H4B 1R6 Canada marek.majewski@concordia.ca.

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Aluminum oxide shelling of cesium lead bromide perovskite nanocrystals enhances superlattice stability and optical properties. Colloidal atomic layer deposition offers superior structural protection and improved photoluminescence compared to other methods.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Superlattices formed by metal halide perovskite nanocrystals exhibit high structural order.
  • This order is significantly influenced by the surface chemistry and morphology of the nanocrystal building blocks.

Purpose of the Study:

  • To investigate the formation of superlattices using aluminum oxide shelled cesium lead bromide (CsPbBr3) perovskite nanocrystals.
  • To evaluate the impact of colloidal atomic layer deposition (c-ALD) for shell growth on superlattice properties.

Main Methods:

  • Growth of aluminum oxide shells on CsPbBr3 perovskite nanocrystals via colloidal atomic layer deposition (c-ALD).
  • Assembly of shelled nanocrystals into superlattices.
  • Assessment of superlattice structural stability over time (25 days in inert atmosphere).
  • Comparison of c-ALD shelled superlattices with those treated by gas phase ALD or excess capping agents.
  • Analysis of nanocrystal size, supercrystal uniformity, photoluminescence quantum yield (PLQY), and radiative lifetimes.

Main Results:

  • Superlattices formed from aluminum oxide shelled CsPbBr3 nanocrystals demonstrated preserved structural stability for over 25 days.
  • c-ALD resulted in smaller nanocrystals, leading to uniform supercrystal formation.
  • c-ALD provided structural protection, enhancing photoluminescence quantum yields and radiative lifetimes compared to other methods.
  • Oleic acid capping on the aluminum oxide shell contributed to static capping group chemistry.

Conclusions:

  • Colloidal atomic layer deposition is an effective method for creating stable, luminescent perovskite nanocrystal superlattices.
  • The shelling process improves structural integrity and optoelectronic properties of the superlattices.
  • These findings offer insights for designing future superlattice assembly strategies.