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相关概念视频

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...
9.6K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
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...
8.5K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

47.0K
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...
47.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.4K
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...
26.4K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.5K
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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长寿(d) CsPbBr3超级格子:用于结构稳定性的合性原子层沉积.

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.

Chemical science
|March 22, 2024
PubMed
概括

氧化物外的氧化物氧化物矿矿矿矿纳米晶体增强超级晶格的稳定性和光学性能. 与其他方法相比,体原子层沉积提供了优越的结构保护和更好的光发光.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 化学 化学 化学

背景情况:

  • 由金属化物矿纳米晶体形成的超级网格表现出高度的结构秩序.
  • 这个顺序受到纳米晶体构建块的表面化学和形态学的显著影响.

研究的目的:

  • 通过使用氧化外的化 (CsPbBr3) 矿纳米晶体来研究超级晶体的形成.
  • 评估体原子层沉积 (c-ALD) 对外生长对超级晶格性质的影响.

主要方法:

  • 氧化外在CsPbBr3矿纳米晶体上通过合性原子层沉积 (c-ALD) 的生长.
  • 将外纳米晶体组装成超级晶格.
  • 评估超级晶格的结构稳定性随着时间的推移 (25天在惰性大气中).
  • 将c-ALD外超级格子与用气相ALD或过量封装剂处理的超级格子进行比较.
  • 对纳米晶体大小,超晶体均性,光发光量产 (PLQY) 和辐射寿命的分析.

主要成果:

  • 由氧化物外的CsPbBr3纳米晶体形成的超级格子证明了超过25天的结构稳定性.
  • c-ALD导致较小的纳米晶体,导致均的超级晶体形成.
  • 与其他方法相比,c-ALD提供了结构保护,提高了光发光量子产量和辐射寿命.
  • 氧化外上的油酸封顶有助于静态封顶组化学.

结论:

  • 体原子层沉积是一种有效的方法,用于创建稳定,发光矿纳米晶体超级晶体.
  • 贝过程提高了超级格子的结构完整性和光电子特性.
  • 这些发现为设计未来的超级晶格组装策略提供了洞察力.